Tow-2 Weapon Systems

TOW2 WEAPON SYSTEM Subcourse Number MM4811 EDITION 9 United States Army Ordnance Missile and Munitions 8 Credit Hours Edition Date: July 1989 SUBCOURSE OVERVIEW This subcourse is designed designed to teach you the characteristics, characteristics, purpose, and functional operation operation of the major assemblies assemblies and subassemblies subassemblies of the the TOW2 TOW2 Weap Weapon on Syst System em. . Cont Contai aine ned d with within in this this subc subcou ours rse e are are inst instru ruct ctio ions ns on all all asse assemb mbli lies es and and suba subass ssem embl blie ies s to ensu ensure re the the student student understand understanding ing of the overal overall l operat operation ion of the TOW2 TOW2 Weapon Weapon System. There are no prerequisites for this subcourse. This subcourse reflects the doctrine which was current at the time the subcourse was prepared. In your own work situation, always refer to the latest publications. The words "he," "him, " "his," and "men," when used in this publication, publication, represent both the masculine and feminine feminine genders genders unless otherwise stated.

TERMINAL LEARNING OBJECTIVE TASK:

You wi will id identify th the ch characteristics an and st state th th e purp purpos ose e of: of: majo major r asse assemb mbli lies es, , suba subass ssem embl blie ies, s, and and asso associ ciate ated d Trai Traini ning ng Equip Equipme ment nt, , and and the the main mainte tena nanc nce e concepts used to support and train personnel for the TOW2 Weapon System.

CONDIT IONS:

You will have the without supervision.

STANDA RDS:

You will answer 19 of 25 questions passing score for this subcourse.

i

subcourse

book,

an d

will

correctly

work

for

a

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TABLE OF CONTENTS

Sectio n

Page

Subcourse Overview ..................................................i Lesson 1: Introduction Introduction to the the TOW2 Weapon Weapon System... System.......... ............. ...........1 .....1 Practice Exercise.........................................16 Answer Key and Feedback...................................18 Lesson 2: TOW2 Functional Functional Theory..... Theory........... ............ ............. ............. ............2 ......20 0 Practice Exercise.........................................28 Answer Key and Feedback...................................30 Lesson 3: TOW2 Test, Test, Measurement, Measurement, and and Diagnostic Diagnostic Equipment Equipment...... ..........32 ....32 Practice Exercise.........................................41 Answer Key and Feedback...................................44 Lesson 4: TOW2 Training Training Set .......... ................ ............ ............. ............. ...........46 .....46 Practice Exercise.........................................57 Answer Key and Feedback...................................60 Lesson 5: TOW2 Maintenance Maintenance Concept... Concept......... ............ ............. ............. ............6 ......62 2 Practice Exercise.........................................67 Answer Key and Feedback...................................69

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LESSON ONE INTRODUCTION TO THE TOW2 WEAPON SYSTEM. Soldier's Soldier's Manual Tasks: 093-411-3911 093-411-3911 093-411-3915 OVERVIEW TASK DESCRIPTION: Direct Direct mainte maintenanc nance e on the TOW2 TOW2 Weapon Weapon System, System, test provide technical assistance to TOW2 repairers.

equipm equipment, ent, and

LEARNING OBJECTIVE: ACTION S:

When you h av ave c om ompleted t hi his lesson, y ou ou should b e able to identify the purpose and function of the major assemblies and subassemblies of the TOW2 Weapon System.

CONDIT IONS:

You will have this without supervision.

STANDA RDS:

Identify the purpos e and function of the major assemblies and subassemblies of the TOW2 Weapon System in accordance with the information contained in this subcourse booklet.

REFE REFERE RENC NCES ES: :

The The mat mater eria ial l con conta tain ined ed in this this less lesson on was was der deriv ived ed from from the following publications. TM FM FM TC

subcourse

book,

and

wil l

work

9-1425-450-12. 23-24. 23-24 (Test). 23-23. INTRODUCTION

The TOW2 TOW2 Weapon Weapon System System is a crew-po crew-porta rtable ble, , heavy heavy anti-t anti-tank ank assaul assault t weapon consisting of a launcher with tracking an d control capa capabil bilit itie ies s and and the the TOW TOW (Tub (Tubee-la laun unche ched, d, Opti Optica call llyy-tra track cked ed, , Wire Wire comm command and-l -lin ink) k) guide guided d miss missil ile. e. The The syst system em is an all terra terrain in, , all all weather, day or night system that is easily maintained and simple to operate. operate. This lesson lesson will identif identify y the purpose and function function of the major assemblies of the TOW2 weapon system.

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Facts about the TOW2 System. Two important features of the TOW2 weapon system are its mobility and simplic simplicity ity of opera operatio tion. n. The launc launcher her consi consists sts of selfself-con contai tained ned repl replace aceab able le units units. . Asse Assembl mbly y and disass disassem embl bly y of the the launch launcher er is acco accompl mplis ishe hed d readil readily y in the the field field withou without t the use of tools. tools. The The operational condition of the launcher system can be checked at any time it is assembled through the use of built-in self-test circuits (no external external test equipme equipment nt is needed). needed). Units which fail the selfselftest are replaced at the operating site. The The miss missil ile e can can be laun launch ched ed from from a grou ground nd impl implac acem emen ent t or from from a vehicle mount and is effective against armored vehicles and targets such such as forti fortifi fied ed emplac emplacem emen ents ts. . The The tact tactic ical al TOW2 weapo weapon n syst system em (Figure (Figure 1-1) 1-1) consists consists of eight eight major major assembl assemblies ies. . These These assembl assemblies ies are the tripod, traversing unit, optical sight, launch tube, missile guidance set, battery assembly (2 ea), power conditioner, and night sight.

Figure 1-1.

TOW2 launcher System. 2

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Tripod. The The trip tripod od (Fig (Figur ure e 1-2) 1-2) is a heav heavyy-du duty ty, , ligh lightw twei eigh ght t unit unit whic which h provides provides ground-mou ground-mounted nted capabili capability ty for the TOW2 TOW2 weapon weapon system. system. Each tripod leg is adjustable and is secured with a leg lock. Flat tripod feet are adaptable to various types of terrain, and have anchor claws which allow allow the tripod unit to be staked staked when necessary. necessary. The tripod tripod has three adjustable legs which allow the weapon system to be leveled and and fold folded ed for easy easy tran transp spor ort. t. Two Two leve level l vial vials s (bub (bubbl ble e leve level l indicators) indicators) are are used used to level the tripod. tripod. A quick quick release release coupling coupling clam clamp p prov provid ides es inst instal alla lati tion on or remo remova val l of the the trav traver ersi sing ng unit unit. . Friction locks provide an adjustment to secure the tripod in a level position.

Figure 1-2.

3

Tripod.

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Traversing Unit. The traversing unit (Figure 1-3) consists of a large main housing and a trunnion device which serves as the mounting base for the launch tube and optical sight. The main housing is capable of revolving 360 degrees in azimuth (horizontal) plane, and the trunnion can elevate through an angle of 50 degrees in the elevation (vertical) plane (30 degrees degrees above above horiz horizont ontal al and 20 degree degrees s below). below). Contro Control l knobs for for use in tracking the target in azimuth and elevation are mounted on the sides sides of the the main main housing housing. . The azimu azimuth th and eleva elevatio tion n signals signals develop pitch and and yaw position. position. The trigger trigger is mounted mounted on the rightrighthand hand side side of the main main housin housing, g, just just above above the contr control ol knob. knob. The The molded cable, which transfers signals between the traversing traversing unit and the the guid guidan ance ce set set (umb (umbil ilic ical al conn connec ecto tor) r), , is moun mounte ted d in the the cup cup underneath underneath the main housing. housing. The bridge bridge clamp clamp is mounted mounted at the top of the trunnio trunnion n device. device. This clamp clamp secures secures the the missile missile container container in the the laun launch ch tube tube, , and and prov provid ides es elec electr tric ical al conn connec ecti tion on betw betwee een n the the launcher and the missile.

Figure 1-3.

Traversing Unit. 4

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Optical Sight. The optical sight assembly (Figure 1-4) consists of an optical sight and an IR trac tracker ker assem assembly bly. . Includ Included ed in the unit unit are are a boresigh boresight t test and and alignment alignment capabili capability. ty. The gunner gunner tracks tracks the the target target through through a 13 power power optica optical l sight. sight. An eyepi eyepiec ece e focus focus contro control l allows allows the oper operat ator or to easi easily ly adju adjust st the the focu focus s of the the eyep eyepie iece ce unti until l the the crosshairs are see n clearly. The tracker assembl y in the sight/s sight/sens ensor or receive receives s infrar infrared ed (IR) (IR) energy energy from the missil missile e during during the flight and senses any missile displacement from the tracker axis of line-of-si line-of-sight. ght. This informa information tion is used to to generate generate the the command command sign signal als s whic which h dire direct ct the miss missil ile e towa toward rd the the targ target et. . Bore Boresi sigh ght t adjustments are used to obtain center-band readings for the boresight self self-te -test st. . Out of band band readin readings gs durin during g the boresi boresigh ght t self self-t -tes est t indicate that the line-of-sight of the optical sight is not properly aligned with the the line-of-sigh line-of-sight t of the tracker tracker assembl assembly. y. A protective protective wind window ow in fron front t of the the lens lens syst system ems s seal seals s out out dust dust, , dirt dirt, , and and moistur moisture e for reliab reliable le operat operation. ion. The optic optics s unit attach attaches es to the traversing unit by an over-center locking mechanism and an indexing plate with a floating plug to permit rapid engagement and connections. The optical sight provides a mounting mounting surface interface for the night sight. sight. No electr electrica ical l (or other) other) connec connectio tions ns are includ included ed at this this inte interfa rface ce. . The The night night sight sight cablin cabling g is exter externa nal l to the the launch launcher er system. The optical optical sight compares compares the instantaneous instantaneous line-of-sigh line-of-sight t to the target and establishes the amount of correction required by the missile missile at any moment during flight. The reticle reticle light control illuminates the optical sight cross-hairs.

Figure 1-4.

Optical Sight. 5

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Launch Tube. The launch tube (Figure 1-5) is constructed of single-wall, single-wall, laminated laminated fiberglass and holds the encased missile on the launcher. The breech end of the launch tube is equipped with an anodized aluminum alloy fitt fittin ing g whic which h perm permit its s rapi rapid d inst instal alla lati tion on and and remo remova val l from from the the traversing unit. The upper portion of the fitting contains two guide pins for indexing and holding the top of the launch tube breech to the traversin traversing g unit unit trunnion. trunnion. The bottom bottom of of the fitting fitting contains contains a steel latch pin which mates with the launch latch on the trunnion trunnion and locks locks the launc launch h tube into into positi position. on. The launc launch h tube suppl supplies ies the the initial stability for the missile trajectory and protects the gunner from exhaust blast.

Figure 1-5.

Launch Tube.

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Missile Guidance Set. The missile guidance set (Figure 1-6) provides facilities for battery inst install allat atio ion, n, and and cont contai ains ns the the elect electro roni nic c circ circui uitr try y nece necessa ssary ry to deve develop lop syst system em opera operati ting ng volta voltage ges. s. It elect electro ronic nical ally ly conve convert rts s information developed by the optical sight and traversing unit into missile steering steering commands. commands. It consists consists of of 20 printed printed circuit cards whic which h are are inst instal alle led d in the chass chassis is assem assembl bly. y. The The powe power r supp supply ly assembly utilizes the DC voltage inputs from the battery assembly to develop develop the the DC and AC AC voltage voltages s for system system oper operati ation. on. Contro Controls ls and indi indicat cator ors s are are prov provid ided ed on the the guid guidan ance ce set set front front panel panel to sele select ct system operation operation mode and to perform perform a system system self-test. self-test. The system system self-test provides a visual indication of overall system operational performance performance by by the use use of the the test-opera test-operate te switch. switch. Missile Missile position position sign signals als, , whic which h prov provid ide e the the miss missil ile e flig flight ht path path erro error r in pitc pitch h and and yaw, are developed in the tracker portion of the optical sight. They are applied to the missile guidance set for summing with rate signals signals from from the traver traversin sing g unit. unit. These These summed summed and proce processe ssed d signals signals are are routed to the missile in flight via the wire-command link to correct the missile flight path.

Figure 1-6.

Missile Guidance Set. 7

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Battery Assembly. Provided Provided with the TOW2 launcher launcher are two battery assemblies (Figure (Figure 17). Each battery battery assembl assembly y has two two 50 VDC VDC cells cells and one one 24 VDC VDC cell. cell. The battery assemblies are rechargeable on the TOW2 battery charger. One One is cont contai aine ned d in the the miss missil ile e guid guidanc ance e set and and prov provide ides s syste system m oper operati ating ng powe power. r. The other other asse assemb mbly ly is an oper operat atio iona nal l spa spare re. . A fully charged battery assembly should allow you to make 50 firings or simulated firings.

Figure 1-7.

Battery assembly.

Power conditioner. The power conditioner (Figure 1-8) is designed designed to replace the battery assembly assembly in the missile missile guidance guidance set. It converts converts vehicle vehicle power power to power needed in the missile guidance set to operate the TOW2 weapon system.

Figure 1-8.

Power Conditioner. 8

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Night Sight. The night sight (Figure 1-9) is a passive device that receives heat emis emissio sions ns (infr (infrar ared ed energ energy) y) from from a targ target et area. area. It conve convert rts s the the infrared infrared (IR) energy to electrical signals and then to visible light, and displays the visible light as a real-time scene for viewing by an observe observer. r. The night night sight sight perfor performs ms this this func functio tion n as follow follows. s. The night night sight sight IR collect collection ion functi function on gather gathers s incomi incoming ng IR energy energy and images the IR energy energy onto onto the converter. converter. The converter converter converts converts the IR energy energy to electri electrical cal signals signals, , and then then conver converts ts the electr electrica ical l signals to visible light. The converter applies the visible light to the visible imaging function which processes the visible light into a real-time scene for viewing by an observer.

Figure 1-9.

Night Sight.

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TOW2 Missile. The TOW2 missile (Figure 1-10) has a 5.98-inch warhead, whereas the basi basic c TOW TOW had had only only a 5.65.6-in inch ch warhe warhead ad. . The The TOW2 TOW2 pene penetr trat atio ion n perf perfor orma manc nce e is furt furthe her r enha enhanc nced ed by fuzi fuzing ng at a grea greate ter r stan stando doff ff distanc distance. e. This This is accompl accomplishe ished d through through the the use of a probe probe that is extended by gases as the missile is launched. A thermal beacon is installed in the rear of the missile opposite opposite the present present xeno xenon n source. source. The therma thermal l beacon beacon is tracke tracked d by the TOW TOW 2 AN/TSAAN/TSA-4A 4A infrar infrared ed sight sight (night (night sight sight). ). It is heated heated by by a thermal thermal source source that that genera generates tes heat heat throug through h a boronboron-tita titaniu nium m interme intermetal tallic lic reactio reaction. n. To help the the tracker tracker ident identify ify the missi missile le thermal thermal beaco beacon n amon among g othe other r natu natural ral or jammi jamming ng sourc sources es, , the the ther therma mal l beac beacon on has has a mechani mechanical cal shutter shutter that interr interrupts upts its output output on command command from the launcher. launcher. The launcher launcher signal signal is is sent to to the missile missile thermal beacon shutter via wire signal "A" to the beacon electronics package in the missile. missile. The shutter shutter movemen movement t is controll controlled ed by helium gas obtained obtained from the supply manifold of the actuator.

Figure 1-10.

TOW2 Missile.

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Tracking Concept. The gunner gunner looks looks throug through h the optica optical l sight sight (Figur (Figure e 1-11), 1-11), acquir acquires es and tracks tracks a target. target. The target target can can be fixed fixed or moving between the ranges of 65 to 3500 meters. He presses ses the trigger on the traversing unit with his right thumb as he continues to track the targ target. et. This This is the only only operati operation on the gunne gunner r perfor performs ms durin during g a missile flight, flight, except except for trackin tracking g the target. target. The traversin traversing g unit sends a positive 24V DC pulse to the missile guidance set causing several several thin things gs to happen happen. . The missi missile le guidanc guidance e set genera generates tes the the "pre "prefi fire re" " sign signal al whic which h is sent sent to the the miss missil ile e to acti activa vate te the the batt batteri eries es and the gyro gyro. . The The missil missile e guidan guidance ce set also also sends sends two sign signal als s to the opti optica cal l sigh sight. t. The The 125V 125V AC, 400 400 HZ sign signal al will will activat activate e the IR tracke tracker r motor, motor, and the resolv resolver er excita excitatio tion n signal signal will will energize energize the refer referenc ence e resolver. resolver. The refere reference nce resolv resolver er will send the pitch and yaw reference reference signals back to the missile guidance guidance set. set. Thes These e signal signals s will be used used in gene genera ratin ting g missil missile e steeri steering ng commands.

Figure 1-11.

TOW2 Tracking Concept.

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Approxi Approximat mately ely 1.5 seconds seconds after after prefire prefire (Figure (Figure 1-12), 1-12), the missil missile e guidance set (MGS) will generate the fire signal which is sent to ignite the missile missile launch motor. After the launch launch motor motor burns out, the the miss missil ile e leav leaves es the the tube tube, , and and the the wing wings s and and cont contro rol l surf surfac aces es extend extend for in-fl in-fligh ight t control. control. The extend extending ing action action of of the control control surf surface aces s acti activa vate tes s swit switch ches es whic which h compl complet ete e circ circui uits ts to allo allow w the the following following sequence sequence of events. events. The IR source will be be energized; energized; the control actuators will be enabled; the safety and arming latch will be unla unlatc tched hed; ; and after after a short short time time dela delay y the the flig flight ht moto motor r will will igni ignite te. . The The flig flight ht motor motor burns burns for 1.5 secon seconds ds and boost boosts s the the missile to a velocity of about 1025 feet per second. When the flight motor burns out, the missile will be at a range of approximately 350 meters. The IR energy energy emitted emitted from from the missile missile IR source source is detecte detected d by the optical optical sight sight sensor sensor system. system. The IR energy energy is converted converted into into electri electrical cal pulses pulses which which repres represent ent pitch pitch and yaw missil missile e positi position. on. Thes These e posi positi tion on sign signal als s go to the the miss missil ile e guid guidan ance ce set set to help help generate the steering commands for flight.

Figure 1-12.

TOW2 Tracking Concept.

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As the gunner tracks the target by moving the traversing unit (Figure 1-13), two signals which represent the horizontal and vertical rate of motio motion n are are sent sent to the missi missile le guida guidanc nce e set. set. Thes These e are are the the azimuth rate signal and the elevation rate signal. The MGS processes the the pitc pitch h and and yaw yaw refe refere renc nce e sign signal als, s, the the pitc pitch h and and yaw yaw miss missil ile e positio position n signals signals, , and the azimut azimuth h and elevati elevation on rate signals signals into into missile steering steering commands. commands. These commands commands will will be transmit transmitted ted to the the missile through the command link wires to steer the missile to the target. Upon impact with the target, the nose crush switch will detonate the warh warhead ead. . Afte After r impa impact, ct, when when the traver traversi sing ng unit unit brid bridge ge clamp clamp is opened to remove the empty missile container, the command link wires are are auto automa mati tica call lly y seve severe red d from from the missil missile e cont contai aine ner. r. The empty empty container container can now be removed and the launcher is ready to be reloaded reloaded for the next firing sequence.

Figure 1-13.

TOW2 Tracking Concept.

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TOW2 Missile. The TOW2 missile (Figure 1-14) is encased in a launch container container which is put into into the TOW2 TOW2 laun launch cher er when when ready ready for use. use. The The enca encase sed d miss missil ile e come comes s in four four prac practi tice ce type types, s, each each of whic which h cont contai ains ns an inactive warhead. These types are: 1. Exte Extend nded ed rang range e (BT (BTMM-71 71A) A). . 2. Norm Normal al rang range e (BT (BTMM-71 71AA-1) 1). . 3. Norm Normal al rang range e (BTM (BTM-7 -71A 1A-2 -2) ) with with MOI MOIC. C. circuit). 4. Exte Extende nded d rang range e (BTM (BTM-7 -71A1A-3) 3) wit with h MOIC MOIC. .

(mis (missi sile le

ord ordna nanc nce e

inhib inhibit it

The encased missile also comes in seven attack types, each of which contains a high explosive warhead. These types are: 1. 2. 3. 4. 5. 6. 7.

Norm Normal al rang range e (BGM (BGM-7 -71A 1A). ). Exte Extend nded ed ran range ge (BG (BGMM-71 71AA-1) 1) Norm Normal al ran range ge wit with h MOIC MOIC (BG (BGMM-71 71AA-2) 2). . Exte Extende nded d rang range e with with MOIC MOIC (BGM (BGM-7 -71A 1A-3 -3). ). Impr Improve oved d 5-in 5-inch ch war warhe head ad (BG (BGMM-71 71C) C). . Improve Improved d 5-in 5-inch ch warhea warhead d with with MOIC MOIC (BGM (BGM-71C -71C-1) -1). . The The TOW2 TOW2 (BGM (BGM-7 -71D 1D). ).

Figure 1-14.

Encased Missile.

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The warhead warhead is is a Class Class A explosiv explosive. e. Do not remove the missile missile from from the launch launch conta containe iner. r. Each Each encased encased missil missile e (Figure (Figure 1-15) 1-15) is color color code coded d to inclu include de pract practic ice e types. types. Refe Refer r to TM 9-142 9-14255-45 4500-12 12 for identification and proper markings.

Figure 1-15.

Encased Missile.

Insp Inspect ectio ion n of encas encased ed missi missile les s is requi require red d once once a year year. . Encas Encased ed missiles missiles in the wooden wooden overpack overpack may may be in a plastic plastic bag. If it is in a bag, a humidity indicator is located in the bag (Figure 1-16) and can be seen through the window in the back of the wooden overpack. If the humidity indicato r is blue, the encased missile is serviceable. serviceable. If the humidity humidity indicator indicator is pink, pink, the encased encased missile missile is unserviceab unserviceable. le. If it is unservi unserviceable, ceable, remove the encased encased missile missile and turn it in to the appropriate ammunition supply point as soon as possible.

Figure 1-16.

Wooden Overpack. 15

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LESSON ONE Practice Exercise The following items will test your grasp of the material covered in this lesson. lesson. There is only one correct correct answer for each item. When you have completed the exercise, check your answers with the answer key that that follow follows. s. If you answe answer r any item item incorrec incorrectly tly, , study study again again that part of the lesson which contains the portion involved. Situ Situat atio ion: n: You You have have been been aske asked d by a subo subord rdin inat ate e questions pertaining to the TOW2 Weapon System.

the the

foll follow owin ing g

1.

What What interr interrupt upts s the the therma thermal l beaco beacon n in the TOW2 TOW2 missil missile? e? A. Hydrau Hydraulic lic shutter. shutter. B. Mechanical Mechanical shutter. shutter. C. AN/TAS AN/TAS-4A -4A. . D. Missil Missile e gyro. gyro.

2.

How many many circ circuit uit card cards s are ther there e in the the missi missile le guida guidance nce set? set? A. 4 B. 6 C. 9 D. 20

3.

How How many many seco second nds s afte after r pref prefir ire e generate the fire signal? A. B. C. D.

4.

the the

miss missil ile e

guid guidan ance ce

set set

10 5 3 1.5

How many second seconds s does does the the missi missile le flig flight ht motor motor burn? burn? A. B. C. D.

5.

does does

1.5 3 5 10

What What appro approxi xima mate te range range, , in mete meters rs, , will the the missil missile e be when the the flight motor burns out? A. 1000 1000 B. 600 C. 350 D. 200 16

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6.

Where Where is the the trigger trigger loca located ted on the the main main housin housing g of the the travers traversing ing unit? A. Left Left hand hand side. side. B. Right Right hand hand side. side. C. Undern Underneat eath. h. D. On top. top.

7.

What What transfe transfers rs signal signals s between between the the travers traversing ing unit unit and the the missil missile e guidance set? A. B. C. D.

8.

What What is the purpos purpose e of of the the powe power r cond conditio itioner ner? ? A. B. C. D.

9.

Emitte Emitter r diodes. diodes. Molded Molded cable. cable. IR trans transmit mitter. ter. Wire Wire signal signal "A". "A".

Replaces Replaces Operat Operates es Operates Operates Operates Operates

the the the the

battery battery assembl assembly. y. radio. radio. traversi traversing ng unit. unit. boresigh boresight t test set. set.

What What supplie supplies s the miss missile ile the the initia initial l stabili stability ty for for traject trajectory ory? ? A. Gyro Gyros. s. B. Comman Command d signals. signals. C. Launch Launch tube. tube. D. Missile Missile guidance guidance set.

10. Where are the missile missile position position signals signals (pitch and and yaw) developed? developed? A. B. C. D.

Optica Optical l sight. sight. Traver Traversin sing g unit. Miss Missil ile. e. Power Power condition conditioner. er.

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LESSON ONE PRACTICE EXERCISE ANSWER KEY AND FEEDBACK

Item

Correct Answer and Feedback

1.

B.

Mechanical shutter.

The TOW2 missile is equipped with a mechanical shutter to interrupt the thermal beacon. (Page 10, para 2.) 2.

D.

20

The missile guidance set contains 20 circuit cards for the purpose of operation. (Page 7, para 1.) 3.

D.

1.5

Once the prefire signal is generated, the missile guidance set will will generate generate the the fire signal 1.5 seconds seconds later. later. (Page 12, para 1.) 4.

A.

1.5

Once the missile flight motor is ignited it burns for 1.5 seconds of missile flight time. (Page 12, para 1.) 5.

C.

350

After 1.5 seconds of missile missile flight motor burn, the missile is appr approx oxima imate tely ly 350 350 meter meters s from from the the laun launch cher er in rang range. e. (Page 12, para 1.) 6.

B.

Right hand side.

On the right hand side of the traversing unit housing you will find the trigger switch. (Page 4, para 1.) 7.

B.

Molded cable.

The signals are transmitted by a molded cable between the miss missil ile e guidan guidance ce set and and the trave travers rsin ing g unit. unit. (Page (Page 4, para 1.)

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Item

Correct Answer and Feedback

8.

A.

Replace battery assembly.

The power power conditi conditione oner r is designe designed d to replac replace e the batter battery y assembly in the missile guidance set. (Page 8, para 2.) 9.

C.

Launch tube.

The The laun launch ch tube tube bein being g moun mounte ted d to the the prov provid ides es the the miss missil ile e a stab stable le plat platfo form rm (Page 6; para 1.) 10.

B.

trav traver ersi sing ng unit unit for for traj trajec ecto tory ry. .

Traversing unit.

The missile position signals are traversing unit. (Page 4, para 1.)

19

develope d

in

th e

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LESSON TWO TOW2 FUNCTIONAL THEORY Soldier's Manual Task: 093-411-3911 093-411-3915 OVERVIEW TASK DESCRIPTION: Direct Direct mainte maintenanc nance e on the TOW2 TOW2 Weapon Weapon System, System, test provide technical assistance to TOW2 repairers.

equipm equipment, ent, and

LEARNING OBJECTIVE: ACTION S:

When you h av ave c om ompleted t hi his lesson, y ou ou should b e able to identify the purpose and function of the major operating signals of the TOW2 Weapon System.

CONDIT IONS:

You will have this without supervision.

STANDA RDS:

Identify the purpose and function of the Traversing Unit Unit, , Miss Missil ile e Guid Guidan ance ce Set, Set, Nigh Night t Sigh Sight, t, Opti Optica cal l Sight, Battery Power Conditioner, and the TOW2 Missile in accordance with the information contained in this subcourse booklet.

REFE REFERE RENC NCES ES: :

The The mat mater eria ial l con conta tain ined ed in this this less lesson on was was der deriv ived ed from from the following publications:

subcourse

book,

and

wil l

work

TM 9-1425-450-12. TM 9-1425-450-34-1. TM 9-5855-450-24.

INTRODUCTION This This lesson lesson contain contains s the block block diagra diagrams, ms, functi functiona onal l diagram diagrams, s, and func functi tion onal al theo theory ry for for the the TOW2 TOW2 weap weapon on syst system em and and its its comp compon onen ents ts auth author oriz ized ed for for repl replac acem emen ent t or adju adjust stme ment nt by DS/G DS/GS S main mainte tena nanc nce e personnel. In this lesson maintenance personnel will become familiar with the function of the TOW2 weapon system.

20

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Traversing Unit. The Traver Traversin sing g Unit Unit (Figur (Figure e 2-1) 2-1) is an electro electro-me -mecha chanic nical al assemb assembly ly which is used to attach the optical sight and launch tube. Mech Mechan anic ical ally ly the the trav traver ersi sing ng unit unit cons consis ists ts of a trun trunni nion on (1), (1), elevation drive system (2), equilibrator (not shown), elevation and azimuth locking mechanism (3), viscous dampers (not shown), and main hous housing ing (4). (4). The The thumb thumb operat operated ed trigg trigger er (5) is locat located ed near near the righ right t hand hand cont contro rol l knob knob (6) (6) and and is used used to init initia iate te the the firi firing ng sequ sequen ence ce. . When When the trigg trigger er is pres presse sed, d, +24 VDC (Volt (Volts s Dire Direct ct Current) is fed through the trigger switch to the missile guidance set where where the timed timed missile missile launch sequen sequence ce signal signals s are produc produced. ed. During the tracking process the rate tachometer generators transform mechanical motion of the traversing unit into electrical analogs of the rate rate of the the motion. motion. The gener generate ated d elevati elevation on and azimu azimuth th rate rate info inform rmat atio ion n is appli applied ed to the the miss missil ile e guid guidan ance ce set. set. Thes These e are are proc proces esse sed d and and beco become me part part of the the stee steeri ring ng comm comman and d sign signal als s whic which h control the missile missile in in flight. flight. Cable assemblies assemblies transmit transmit electrical electrical signals between the missile guidance set, optical sight, traversing unit, and missile. The The trav traver ersi sing ng unit unit is chec checke ked d for for prope proper r opera operati tion on in the the syst system em check-out check-out procedure. procedure. In this procedu procedure re a balance balance check check is performed. performed. The system system checks checks the elevation elevation and azimuth azimuth tachomete tachometers. rs. The desired desired indi indica cati tion ons s for for this this chec check k are are not not outout-of of-b -ban and d read readin ings gs, , but but move movemen ments ts to the the dire directi ction on of the appli applied ed force force, , as indic indicat ated ed on azimuth/elevation cross on the missile guidance set.

Figure 2-1.

Traversing Unit.

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Traversing Unit. Electri Electrical cally ly the travers traversing ing unit unit consist consists s of a wire wire cutter cutter switch switch, , wiring wiring harnes harness, s, trigger trigger (firing (firing) ) switch, switch, and elevat elevation ion and azimut azimuth h rate tachomet tachometer er generator generators. s. The electrica electrical l wiring wiring of the traversi traversing ng unit (Figure 2-2) carries the signals signals that the AN/TAS-4A generates generates as well as the signals signals from from the missile guidance guidance set. It also carries carries sign signals als and and volt voltag ages es from from the the opti optica cal l sigh sight t (OSS) (OSS) and and the the miss missil ile e guidanc guidance e set (MGS), (MGS), and from the trigge trigger/ra r/rate te tachome tachometer ters s and the MGS. MGS. Signa Signals ls from from the the breech breech and and MGS are are the pitch pitch, , yaw, yaw, fire, fire, prefire, wire cutter, and trigger signal.

Figure 2-2.

Traversing Unit Wiring Harness.

22

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Optical Sight The optical sight (Figure 2-3) contains the tracker optical system, the infrared (IR) sensor, the preamplifier, the internal electrical boresig boresight ht circuit circuits, s, and the refer reference ence resolv resolver. er. The optica optical l sight comp compare ares s the the inst instan anta tane neou ous s line line-of -of-s -sig ight ht to the the miss missil ile e with with the the instantaneous line-of-sight to the target and establishes the amount of corr correc ecti tion on requ requir ired ed by the the miss missil ile e at any any mome moment nt duri during ng the the flight. Crosshairs Crosshairs in the tracker tracker optical optical system system are are used to assist assist in tracking the target and thereby establishing establishing a reference reference line from the optic optical al sight sight to the targe target. t. The IR senso sensor r receive receives s IR energy energy from the missile in flight, and thereby establishes a reference line from the IR sensor to the missile. The preamplifier receives signals from the IR sensor, amplifies them, and delivers them to the missile guidance guidance set. The internal internal electric electrical al boresight boresight circuits circuits are are used to to verify the alignment alignment of the optical sight with with the the IR sensor. sensor. This alignment establishes a common reference between the target and the miss missile ile in fligh flight. t. The The refe refere renc nce e reso resolv lver er gener generat ates es elect electri rica cal l refe refere renc nce e sign signal als s whic which h are are repr repres esen enta tati tive ve of the the pitc pitch h and and yaw yaw plan planes es betwe between en the optic optical al sight sight and the targe target. t. The The refere referenc nce e signals are utilized in conjunction with signals from the IR sensor to dete determ rmin ine e the the magn magnit itud ude e and and dire direct ctio ion n of guid guidan ance ce corr correc ecti tion on signals required by the missile.

Figure 2-3.

Optical Sight. 23

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Night Sight. The The Nigh Night t Sigh Sight t (Fig (Figur ure e 2-4) 2-4) is an elec electr troo-op opti tica cal l syst system em that that incl include udes s both IR and visib visible le light light optics optics. . The The afocal afocal assem assembl bly y opti optics cs gathe gathers rs IR energ energy y and colli collima mate tes s it onto onto the the scan scan mirro mirror. r. Eith Either er of two magn magnif ific icati ation ons s may be used. used. The The IR imager imager optic optics s (opt (optica ical l image imager) r) focu focuse ses s the the IR ener energy gy from from the the scan scan mirro mirror r into into infrared infrared detectors detectors in the detector/Dewa detector/Dewar. r. The detector detectors s convert convert IR ener energy gy to video video signal signals. s. The vide video o signal signals s are proces processe sed d by the the video video electr electroni onics. cs. The video video is is convert converted ed to visibl visible e light light by an emitter emitter assemb assembly ly (LED array) array). . The visual visual collim collimato ator r transfer transfers s the visi visible ble ligh light t from the emit emitte ter r assemb assembly ly onto onto a scan scan mirro mirror. r. The The objecti objective ve lens/ro lens/roof of mirror mirror assembl assembly y optics optics directs directs this light light onto onto the display reticle for viewing through the eyepiece optics. • •

WFOV: Wide field of view. NFOV: Narrow field of view.

Figure 2-4.

Night Sight.

24

MM 48 11

Missile Guidance Set. The Missile Guidance Set (MGS) (Figure 2-5) is the "BRAINS" of the TOW2 weapon weapon system. system. it contains contains the necessary necessary circuitry circuitry to develop the the oper operat atin ing g volt voltag ages es, , timi timing ng sign signal als, s, and and exci excita tati tion on volt voltag age e required to develop reference signals for pitch and yaw commands for the the missile missile. . When When timin timing g signal signals s are applie applied d to the the excita excitati tion on gene generat rator or and and self self-t -tes est t card card, , it gene genera rates tes a progr program amme med d reso resolv lver er excitation excitation voltage which is sent to the optical sight for development development of reference reference voltages voltages. . When the the missile missile is in flight, flight, the pitch pitch and yaw error signals from the optical sight are applied to the pitch and yaw error error detector detector cards cards respectively respectively. . The signals signals are then then compared compared with the the pitch pitch and yaw referenc reference e signals. signals. The pitch pitch error error detector detector card output is applied to the pitch command signal generator card and combined with the output of the elevation rate generator. The output of the the pitc pitch h comm command and signa signal l gene genera rato tor r card card is appl applie ied d to the the yaw yaw comm comman and d sign signal al gene genera rato tor r card card wher where e its its freq freque uenc ncy y modu modula late tes s an oscillator. oscillator. Similarly, Similarly, the the output output of the yaw error error detector detector card card is applied to the yaw command signal generator card and combined with the outpu output t of the azimu azimuth th rate rate generat generator. or. The yaw yaw command command signa signal l generator generator card card frequency frequency modulates modulates a second oscillator. oscillator. The outputs outputs of these these two oscill oscillato ators, rs, which which have have differ different ent center center freque frequenci ncies, es, are multiplexed and sent down the wire command link to the missile. This This mult multip iple lexe xed d sign signal al is deco decode ded d into into pitc pitch h and and yaw yaw stee steeri ring ng signals by the missile electronic circuits.

Figure 2-5.

Missile Guidance Set. 25

MM 48 11

Battery Assembly. The batter battery y assembl assembly y (Figur (Figure e 2-6) 2-6) has three three separa separate te rechar rechargea geable ble stor storage age batte batteri ries es, , whic which h are are elec electr trica icall lly y inde indepe pend nden ent t and and can can be individually individually removed and replaced. replaced. The battery battery is installed installed in the miss missile ile guid guidanc ance e set set and and prov provid ides es outp output ut volt voltag ages es of +24 +24 VDC, VDC, +50 +50 VDC, VDC, and -50 -50 VDC. Volt Voltag ages es from from the batte battery ry are suppl supplie ied d to the power supply assembly where they are converted into the TOW2 weapon system operating operating voltages. voltages. A fully fully charged charged battery battery assembly assembly should should allow allow 50 firings firings or simula simulated ted firing firings. s. Test Test equipme equipment nt require required d to test test the the batt batter ery y asse assemb mbly ly are are the the powe power r moni monito tor r cabl cable, e, digi digita tal l multimeter, and the missile guidance set test set.

Figure 2-6.

Battery Assembly.

26

MM 48 11

TOW2 Missile. The TOW2 missile (Figure 2-7).with its shutter beacon can penetrate obsc obscura urant nts. s. When When the night night sight sight picks picks up the the infrar infrared ed from from the miss missil ile, e, it will will tran transm smit it the the miss missil ile e loca locati tion on to the the miss missil ile e guidance guidance set. At the same time time the missile guidance guidance set checks the line-of line-of-si -sight ght (LOS) (LOS) of the the target. target. The wire wire link link signals signals from from the TOW2 TOW2 syste system m are pitc pitch h and yaw. yaw. Thes These e pitch pitch and and yaw signa signals ls are are sepa separat rated ed and and passe passed d to disc discrim rimin inat ator or circ circuit uits s insi inside de the miss missil ile e electronics. electronics. The discrimin discriminator ator changes the sine sine wave pitch and and yaw signals into square wave signals that contain the change of control fin correc correctio tion n data. data. Zero cross crossing ing detect detectors ors are are modified modified by this this pitc pitch h and yaw squa square re wave wave. . This This modi modifi fies es the the time on the the limit limit stop stops, s, and and chan change ges s the the dire direct ctio ion n in pitc pitch h (ele (eleva vati tion on) ) and and yaw yaw (azimut (azimuth) h) of the missil missile. e. Four Four missile missile actuat actuators ors are are required required and and provide independent independent control control of fin operation. operation. The modulated modulated signals signals from from the the miss missil ile e guid guidan ance ce set set are are trans transmi mitt tted ed by the the comm comman and d wire wire link to the missile where they are demodulated by the missile into steering commands.

Figure 2-7.

TOW2 Missile.

27

MM 48 11

LESSON TWO Practice Exercise The following items will test your grasp of the material covered in this lesson. lesson. There is only one correct correct answer for each item. When you have completed the exercise, check your answers with the answer key that that follow follows. s. If you answe answer r any item item incorrec incorrectly tly, , study study again again that part of the lesson which contains the portion involved. Situ Situat atio ion: n: You You have have been been aske asked d by a subo subord rdin inat ate e questions pertaining to the TOW2 Weapon System.

the the

foll follow owin ing g

1.

What What voltag voltages es are are supp supplied lied by the the batt battery ery asse assembl mbly? y? A. +24 +24 VDC VDC, , +50 +50 VDC, VDC, and and -50 -50 VDC. VDC. B. +24 +24 VDC VDC, , -24 -24 VDC, VDC, and and +50 +50 VDC. VDC. C. +28 +28 VDC VDC, , +24 +24 VDC, VDC, and and -24 -24 VDC. VDC. D. +128 +128 VAC, VAC, -50 -50 VDC VDC, , and and +50 +50 VDC VDC. .

2.

When the trigger guidance set? A. +120 VDC. B. +60 VDC. C. +24 VDC. D. -12 VDC.

3.

What What tran transf sfor orms ms mech mechan anic ical al moti motion on analogs? A. +24 VDC. B. Pitc Pitch h erro error r dete detect ctor ors. s. C.. Yaw error error detec detector tors. s. D. Rate Rate tac tacho home mete ter r gene genera rato tors rs. .

4.

What What veri verifi fies es the the alin alinem emen ent t of sensor? A. Yaw plane. B. Refe Refere renc nce e reso resolv lver ers. s. C. Bore Boresi sigh ght t cir circu cuit its. s. D. Rate Rate tac tacho home mete ter r gene genera rato tors rs. .

5.

What What assembl assembly y of the the night night sight sight conve converts rts video video to to visible visible ligh light? t? A. Emitter ass assembly. B. IR detectors. C. Scan mirror. D. Afocal as assembly.

is

pressed sed

28

what

signal

of

the the

the the

is

sent

to

trav traver ersi sing ng

opti optica cal l

sigh sight t

missile

unit unit

with with

into into

the the

IR

MM 48 11

6. What What is rece receiv ived ed by the the opti optica cal l sigh sight t to elec electro troni nica call lly y proc proces ess s into pitch and yaw reference signals? A. B. C. D.

Pitc Pitch h and and yaw yaw comm comman and d puls pulses es. . Azim Azimut uth h rat rate e sig signa nals ls. . Elev Elevat atio ion n rate rate sign signal als. s. IR energy.

7. Wher Where e are are the the pitc pitch h steering signals? A. B. C. D.

yaw yaw

refe refere renc nce e

sign signal als s

demo demodu dula late ted d

into into

Missile . Miss Missil ile e gui guida danc nce e set set. . Traversin sing un unit. Optical si sight.

8. Where is missile? A. B. C. D.

and and

the

IR

source

generated

that

is

used

to

track

the

Traversin sing un unit. Optical si sight. Miss Missil ile e gui guida danc nce e set set. . Missile .

9. What What is requ requir ired ed from the missi missile le in orde order r for for the the optic optical al sight sight to cont contin inue ue to prov provid ide e miss missil ile e posi positi tion on data data to the the miss missil ile e guidance set? A. B. C. D.

Pitc Pitch h and and yaw yaw comm comman ands ds. . Azim Azimut uth h rat rate e sig signa nals ls. . Elev Elevat ation ion tach tachom omet eter er signa signals ls. . IR energy.

10. How many actuators actuators are required required for independe independent nt fin control? control? A. B. C. D.

1 2 3 4

29

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LESSON TWO PRACTICE EXERCISE ANSWER KEY AND FEEDBACK Item

Correct Answer and Feedback

1.

A.

+24 VDC, +50 VDC, and -50 VDC.

The battery assembly provides output voltages of +24 VDC, +50 VDC and -50 VDC. (Page 26, para 1.) 2.

C.

+24 VDC.

When the operator presses the trigger it sends a +24 VDC signal to the missile guidance set. (Page 21, para 1.) 3.

D.

Rate tachometer generators.

The mechanical motion of the traversing unit is transformed transformed into into anal analog ogs s by the the rate rate tach tachom omet eter er gene genera rato tors rs in the the traversing unit. (Page 21, para 1.) 4.

C.

Boresight circuits.

The optical sight and IR sensor alinement is verified by the boresight circuits. (Page 23, para 1.) 5.

A.

Emitter assembly.

The The vide video o is conv conver erte ted d to visi visibl ble e assembly. (Page 24, para 1.) 6.

D.

ligh light t

by

an

emit emitte ter r

IR energy.

The The opti optica cal l sigh sight t rece receive ives s IR ener energy gy to elec electr tron onic ical ally ly proc proces ess s into into pitc pitch h and and yaw yaw refe refere renc nce e sign signal als s for for the the missile guidance set. (Page 23, para 1.) 7.

A.

Missile.

The The pitc pitch h and and yaw yaw refe refere renc nce e sign signal als s are are sent sent from from the the traversing unit to the missile guidance set where they are modulated modulated with with other signals. signals. These modulated modulated signals are sent to the missile where they are demodulated into steering signals. (Page 27, para 1.) 30

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Item

Correct Answer and Feedback

8.

D.

Missile.

Once Once the the miss missil ile e leav leaves es the the laun launch ch tube tube it begi begins ns to gene genera rate te an IR ener energy gy sour source ce that that perm permit its s the the opti optica cal l sigh sight/ t/ni nigh ght t sigh sight t to trac track k the the miss missil ile e to the the targ target et. . (Page 27, para 1.) 9.

D.

IR energy.

IR energy is required to be produced by the missile until impact in order for the optical sight to keep the missile guid guidan ance ce set set cont contin inua uall lly y updat updated ed with with missi missile le posi positi tion on data. (Page 23, para 1.) 10.

D.

4 Actuators.

Four missile actuators are required required and provide independent control of missile fin operation. (Page 27, para 1.)

31

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LESSON THREE TOW2 TEST, MEASUREMENT, AND DIAGNOSTIC EQUIPMENT Soldier's Manual Task: 093-411-3911 093-411-3915 OVERVIEW TASK DESCRIPTION: Direct Direct Mainte Maintenanc nance e on the TOW2 TOW2 Weapon Weapon System, System, test provide technical assistance to TOW2 repairers.

equipm equipment, ent, and

LEARNING OBJECTIVE: ACTION S:

When you h av ave c om ompleted t hi his lesson, y ou ou should b e able to identify the purpose and function of the test, measur measuremen ement, t, and diagno diagnosti stic c equipm equipment ent (TMDE) (TMDE) of the TOW2 Weapon System.

CONDIT IONS:

You will have this without supervision.

STANDA RDS:

Identify the purpos e and function of the test, measur measuremen ement, t, and diagno diagnosti stic c equipm equipment ent (TMDE) (TMDE) of the TOW2 Weapon System in accordance with the information contained in this subcourse booklet.

REFE REFERE RENC NCES ES: :

The The mat mater eria ial l con conta tain ined ed in this this less lesson on was was der deriv ived ed from from the following publications:

subcourse

book,

and

wil l

work

TM 9-4935-450-14. TM 9-4935-455-14. TM 9-4935-451-14. INTRODUCTION The test, measurement, measurement, and diagnostic equipment (TMDE) is designed designed to provide the necessary test equipment to maintain and verify the TOW2 weapon system. system. Each contact contact support team (CSS) (CSS) and maintenance maintenance shop shop is equipped with the equipment required to sustain their operation. This lesson describes the characteristics and functions of the major test equipment required to maintain the TOW2 weapon system.

32

MM 48 11

Missile Guidance Set Test Set (AN/TSM-152). The missil missile e guidan guidance ce set test test set (Figur (Figure e 3-1)(M 3-1)(MGST GSTS) S) provid provides es the capabil capability ity of rapidl rapidly y isolat isolating ing a TOW2 TOW2 missile missile guidanc guidance e set (MGS) (MGS) failure to the printed printed circuit circuit card card level. level. The test test set set interfaces interfaces with with the the MGS test test sign signal als, s, and and perm permits its cont contro rol l of micro micropr proc oces esso sor r fault fault diagno diagnosti stic c functi functions, ons, genera generates tes necessa necessary ry test test signal signals, s, and provide provides s a display display of test test resul results. ts. The test test set set is also also used used in TOW2 system system verificati verification. on. It displays displays fault fault isolation isolation error error codes codes (2 or 3 digit error codes). codes). Connecting Connecting cables cables are stored stored inside inside the top top cover cover of the case. case. Some Some of the error error codes codes are are listed listed on the the test set set fron front t pane panel. l. Test Test point point jacks jacks, , a volt voltag age e sele select ct knob, knob, and cont contro rol l push push-b -but utto ton n swit switch ches es (rea (ready dy, , trig trigge ger, r, and and rese reset) t) allo allow w missile guidance guidance set system system maintena maintenance nce checks checks to be made. made. The test test set set can can be opera operate ted d from from an inte intern rnal al rech rechar argea geabl ble e batte battery ry or from from alternating current line power.

Figure 3-1.

Missile Guidance Set Test Set.

33

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Electrical Cable Test Set (AN/TSM-149). The The elec electr tric ical al cabl cable e test test set set (Fig (Figur ure e 3-2) 3-2) is used used to chec check k out out trav traver ersi sing ng unit unit cabl cables es (2W1 (2W1 and and 2W3) 2W3), , and and the the trav traver ersi sing ng unit unit internal wiring harness. It allows most common shorts to shield, and continu continuity ity check checks s to be performe performed d through through the traver traversin sing g unit. unit. It contains the 23-position wire selection switch, the toggle switch for sele selecti ction on of shor short t or cont contin inui uity ty chec checks ks, , and and the the wafer wafer swit switch ch for for selecti selection on of the the functio function n to be tested tested. . The contin continuit uity y fixture fixture is part of the electrical cable test set.

Figure 3-2.

Electrical Cable Test Set.

34

MM 48 11

Amplifier Test Set (AN/TAM-5). The amplifier test set (Figure 3-3) is used during checkout of the night sight, sight, with with the AN/TAM-3. AN/TAM-3. Functions Functions of the the amplifier amplifier test test set include include operat operation, ion, verifi verificati cation, on, trouble troublesho shooti oting, ng, and alineme alinement nt of the postampli postamplifier fier assembly assembly used with with the AN/TAS-4A AN/TAS-4A night night sight. sight. The test set is used in conjunction conjunction with the night vision sight test set, modi modifie fied d to suppo support rt the TOW2 TOW2 night night sight. sight. Majo Major r contro controls ls of the amplifier test set are video channel select, gain select, and signal sele select ct. . Mode Mode of oper operat atio ion n is dete determ rmin ined ed by the the manu manual al/a /aut uto, o, stop/st stop/start art, , and reset reset switch switches. es. Major Major items items for the the various various test test configu configurat ration ions s includ include e the use of the vehicl vehicle e power power condit condition ioner, er, a load box, several new cables, and the night vision sight test set targ target et sourc source. e. Inte Intern rnal ally, ly, the the amplif amplifie ier r test set contai contains ns one circuit card and a power module.

Figure 3-3.

Amplifier Test Set (AN/TAM-5).

35

MM 48 11

Electrical Circuit Test Set (AN/TSM-158). The electrical circuit test set (Figure 3-4) is used for TOW2 system checkout. The electrical circuit test set, when placed in the breech of the traversing unit, gives electrical access to the TOW2 weapon syst system em umbil umbilic ical al inter interfa face ce. . The The test set simul simulat ates es the missi missile le electrical identifier signature as an aid to system testing.

Figure 3-4.

Electrical Circuit Test Set. 36

MM 48 11

AN/TAM-3A Test Set, Night Vision Sight. The AN/TAM-3A Test Set, Night Vision Sight, (Figure 3-5) contains the necessar sary equipment to perfo rform any maintenance requiring an oscilloscope, multimeter, or power supply for the TOW2 weapon system. There are are three three special special tool tool container containers. s. Each provide provides s storage storage for the the UUT UUT (Uni (Unit t Unde Under r Test) Test) mount mount asse assembl mbly y and and inte interf rface ace, , and and othe other r special tools and test equipment needed to test and repair the TOW2 weapon system. system. The AN/TAM-3A AN/TAM-3A consists consists of three three containe containers, rs, and they are as follows: 1.

Box 1 . Special interface).

2.

Box Box 2. 2. Osci Oscill llos osco cope pe (SC5 (SC502 02), ), digi digita tal l mul multi time mete ter r (SC (SC50 501) 1), , pow power er supply (6284A), and the frame (SC503).

3.

AN/TA AN/TAMM-3A 3A coll collim imato ator r and and clos closed ed cycle cycle cool cooler er test test set. set.

Figure 3-5.

t oo ools

container

( UU UUT

m ou ount

a ss ssembly

a nd nd

AN/TAM-3A Test Set, Night Vision Sight.

37

MM 48 11

Battery Charger Monitor Unit. The The batt batter ery y char charger ger monit monitor or unit unit (Fig (Figur ure e 3-6) 3-6) is used used to perfo perform rm voltage voltage and and continu continuity ity check checks s of the batter battery y charger charger 4884 4884 A/T. A/T. It prov provid ides es test test jack jacks s and and swit switch ches es used used when when trou troubl bles esho hoot otin ing g and and perform performing ing final final inspe inspectio ction n of the battery battery charg charger. er. J1 through through J9 provide test jacks jacks to connect connect a multimeter. multimeter. J2 and J3 J3 check battery battery B1 for +24 +24 VDC. J5 and J6 check check batt battery ery B2 for for +50 VDC, VDC, and J8 J8 and J9 chec check k batte battery ry B3 for for -50 VDC. VDC. Conn Connect ector ors s B1, B2, B2, and B3 are are util utilize ized d when when chec checki king ng the the batt batter ery y asse assembl mbly y for for prop proper er oper operat atin ing g volt voltage ages. s. Swit Switch ch S1 is used used to open and and close close the circu circuit it while while performing voltage checks.

Figure 3-6.

Battery Charger Monitor Unit.

38

MM 48 11

Power Conditioner Test Adapter. The power conditioner test adapter (Figure 3-7) is used to trou trouble blesh shoo oot t and and perf perfor orm m chec checko kout ut proce procedu dure res s of the the TOW2 TOW2 vehi vehicl cle e powe power r condit conditio ione ner. r. It provi provide des s test jacks jacks and switc switche hes s for the purpose of testing the power conditioner for proper operation under load and and no-load no-load conditions conditions. . It provides provides the the necessary necessary interface interface to conf confir irm m acce accept ptan ance ce of the powe power r cond condit itio ione ner. r. The The inpu input t swit switch ch distributes 24 VDC through the test adapter to the TOW2 vehicle power conditioner conditioner (TVPC). (TVPC). B1, B2, and B3 are are three way toggle toggle switches switches to check for for power power output output voltages voltages of of the TVPC. TVPC. The monitor monitor switch switch is is used to to increase/d increase/decreas ecrease e simulated simulated load. Hi and Lo jacks jacks are are used to monitor output voltages to the missile guidance set.

Figure 3-7.

Power Conditioner Test Adapter.

39

MM 48 11

TOW Supplemental Test Equipment. The TOW supplemental test equipment kit (TA-20)(Figure 3-8), used to test and align the TOW2 traversing unit (TU), consists of two cases. These are the TU test fixture No. 1 (box 1), and test fixture No. 2. (box (box 2). The The suppl suppleme ement ntal al kit is used used to perfo perform rm the bore boresi sigh ght t alin alineme ement nt when when used with with the auto collim collimat ator or. . The cases cases conta contain in special tools and fixtures used to perform the azimuth and elevation test, the cha chain compliance test, the bri bridge clamp test, and traversing traversing unit unit troublesh troubleshooting. ooting. The kit kit is stored stored on the curbside curbside wall of the improved contact support set (ICSS).

Figure 3-8.

TOW2 Supplemental Test Equipment.

40

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LESSON THREE Practice Exercise The following items will test your grasp of the material covered in this lesson. lesson. There is only one correct correct answer for each item. When you have completed the exercise, check your answers with the answer key that that follow follows. s. If you answe answer r any item item incorrec incorrectly tly, , study study again again that part of the lesson which contains the portion involved. Situ Situat atio ion: n: You You have have been been aske asked d by a subo subord rdin inat ate e questions pertaining to the TOW2 Weapon System.

the the

foll follow owin ing g

1.

What What is used used to to conf confir irm m the the acce accept ptanc ance e of the the powe power r cond condit itio ione ner? r? A. Bat Battery ass assembly. B . O scilloscope. C. Elec Electr tric ical al cir circu cuit it tes test t set. set. D. Power Power cond condit itio ione ner r tes test t ada adapt pter er. .

2.

What What jac jacks ks on on the the batt batter ery y char charge ger r moni monito tor r unit unit are are pro provi vide ded d for for checking the battery assembly? A. J1 through J9. B. B1, B2, and B3. C. J1 and J2. D. J4 and J5.

3.

What What pie piece ce of of test test equ equip ipme ment nt is is used used to to gain gain acc acces ess s to the the TOW TOW2 2 system umbilical interface? A. Miss Missil ile e gui guida danc nce e set set. . B. Ampl Amplif ifie ier r test test set. set. C. Elec Electr tric ical al cir circu cuit it tes test t set. set. D. Bore Boresi sigh ght t test test set. set.

4.

What What pie piece ce of of test test equ equip ipme ment nt is is used used to to alin aline e the the post postam ampl plif ifie ier r in the AN/TAS-4A? A. Bore Boresi sigh ght t colli collima mato tor. r. B. Ampl Amplif ifie ier r test test set. set. C. AN/T AN/TAM AM-3 -3A A colli collima mato tor. r. D. IR co collimator.

5.

How How many many test test poin points ts are are there there on the the elect electri rica cal l circ circui uit t test test set? A. 8 B. 10 C. 16 D. 20

41

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6.

What What pie piece ce of of test test equ equip ipme ment nt is is used used to to chec check k out out cabl cables es 2W1 2W1 and and 2W3 of the traversing unit? A. B. C. D.

7.

two two/three

digit

error

Miss Missil ile e guid guidan ance ce set set tes test t set. set. Ampl Amplif ifie ier r test test set. set. Elec Electr tric ical al cir circu cuit it tes test t set. set. Elec Electr tric ical al cabl cable e tes test t set set. .

Bore Boresi sigh ght t test test fixt fixtur ure. e. IR co collimator. Aut Auto co collimator. AN/T AN/TAS AS-4 -4A A test test adap adapto tor. r.

What What are are the the two two tes test t cond condit itio ions ns in in whic which h the the powe power r cond condit itio ione ner r test adapter checks the power conditioner? A. B. C. D.

10. 10.

displays ays

What What is is used used wit with h test test fix fixtu ture res s No.1 No.1 and and No. No.2 2 to ali aline ne the the TOW TOW2 2 traversing unit? A. B. C. D.

9.

cir circu cuit it tes test t set. set. unit unit test test set. set. test test set. set. cabl cable e tes test t set set. .

Wha What piece of test equipment codes when checking faults? A. B. C. D.

8.

Elec Electr tric ical al Trav Traver ersi sing ng Coll Collim imat ator or Elec Electr tric ical al

Load Load and and con conti tinu nuit ity. y. AC load only. DC load only. Loa Load and no load.

Where Where are are tes test t fixtu fixture res s No.1 No.1 and and No.2 No.2 stor stored ed? ? A. B. C. D.

Ampl Amplif ifie ier r tes test t set set cove cover. r. Miss Missil ile e gui guida danc nce e set set cov cover er. . ICSS shelter. QA/QC sh shelter.

42

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THIS PAGE IS INTENTIONALLY LEFT BLANK

43

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LESSON THREE PRACTICE EXERCISE ANSWER KEY AND FEEDBACK Item

Correct Answer and Feedback

1.

D.

Power conditioner test adaptor.

When When confirm confirming ing the accept acceptanc ance e of the power power condit condition ioner, er, the power power condition conditioner er test adapter adapter is used. used. (Page 39, para para 1.) 2.

B.

B1, B2, and B3.

These jacks are used to check the battery assembly under operating conditions. (Page 38, para 1.) 3.

C.

Electrical circuit test set.

To gain access to the TOW2 system umbilical interface the electrical circuit test set is used. (Page 36, para 1.) 4.

B.

Amplifier test set.

The The AN/TA AN/TASS-4A 4A is a nigh night t visi vision on sigh sight t and and the the ampl amplif ifie ier r test set is used to aline the postamplifier in the AN/TAS4A. (Page 35, para 1.) 5.

C.

16

For For use use in test test and and chec checko kout ut proce procedu dure res, s, the the elec electr tric ical al circui circuit t test set set is equi equippe pped d with 16 16 test points. points. (Page (Page 36, para 2.) 6.

D.

Electrical cable test set.

Cables 2W1 and 2W3 in the traversing unit are checked by the use use of the elec electric trical al cable cable test test set. set. (Page (Page 34, 34, para 1.) 7.

A.

Missile guidance set test set.

The The two/ two/th thre ree e digi digit t erro error r code codes s are are disp displa laye yed d on the the missil missile e guidanc guidance e test set set during during fault fault isol isolatio ation. n. (Page (Page 33, para 1.) 44

MM 48 11

Item

Correct Answer and Feedback

8.

C.

Auto collimator.

To align the traversing unit, the auto collimator is used with test fixtures No. 1 and No. 2. (Page 40, para 1.) 9.

D.

Load and no load.

The two test conditions in which the power conditioner is checked are load and no load conditions. (Page 39, para 1.) 10.

C.

ICSS shelter.

The test test fixtu fixtures res are are store stored d in the ICSS ICSS shel shelter. ter. 40, para 1.)

45

(Page (Page

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LESSON FOUR TOW2 TRAINING SET Soldier's Manual Task: 093-411-3911 093-411-3915 OVERVIEW TASK DESCRIPTION: Direct Direct mainte maintenanc nance e on the TOW2 TOW2 Weapon Weapon System, System, test provide technical assistance to TOW2 repairers.

equipm equipment, ent, and

LEARNING OBJECTIVE: ACTION S:

When you h av ave c om ompleted t hi his lesson, y ou ou should b e able able to iden identi tify fy the the purp purpos ose e and and use use of the the TOW2 TOW2 training equipment.

CONDIT IONS:

You will have this without supervision.

STANDA RDS:

Identify the the pur purpose and and use use of TO TOW2 tra training set set in acco accord rdan ance ce with with the the info inform rmat atio ion n cont contai aine ned d in this this subcourse booklet.

REFE REFERE RENC NCES ES: :

The The mat mater eria ial l con conta tain ined ed in this this less lesson on was was der deriv ived ed from from the following publications:

subcourse

book,

and

wil l

work

TM 9-6920-450-12. TC 23-24. TC 23-24 (Test). INTRODUCTION

The TOW2 training set is a crew-portable trainer that is used for gunner gunner traini training, ng, teachi teaching ng instru instructo ctors, rs, practi practice, ce, and qualif qualifica icatio tion n with the TOW2 launcher. In this lesson you will be given the purpose and use of the TOW2 training training equipment. equipment. This informati information on is vital vital to personnel who will use and maintain this equipment.

46

MM 48 11

Training Set. The The trai traini ning ng set set prov provide ides s a safe safe econ economi omica cal l way way of train trainin ing g TOW2 TOW2 gunners gunners witho without ut firing firing tactic tactical al missil missiles. es. The traini training ng set may may be used used in any any simu simula late ted d tact tactica ical l opera operati tion on and and will will oper operat ate e in all all weat weather her cond conditi ition ons s in whic which h the the TOW2 TOW2 gunn gunner er can trac track k the the targ target et. . The training set (Figure 4-1) is used with the TOW2 launcher system to train the TOW2 gunner in in tracking tracking targets. targets. There are are two modes modes of operati operation. on. They They are practic practice e and qualifi qualificat cation ion. . The traini training ng set consist consists s of a target target set, set, instru instructo ctor r console console, , batter battery y assemb assemblie lies, s, cable set case, and connecting cables.

Figure 4-1.

Training Set. 47

MM 48 11

Target set. The target set consists of a thermal target board, target source, and a power supply/modulator (Figure 4-2).

Figure 4-2. 48

Target Set. MM 48 11

Instructor Console Unit (ICU). The The inst instru ruct ctor or cons consol ole e (Fig (Figur ure e 4-3) 4-3) is a self self-c -con onta tain ined ed batt batter ery y powered unit that includes electronic circuits necessary to process error signals signals from the the missile missile guidance guidance set set (MGS). (MGS). The MGS compares compares the the dete detect cted ed infr infrar ared ed ener energy gy (IR) (IR) sign signal als s from from the the opti optical cal sigh sight t pitc pitch h and and yaw yaw refe refere renc nce e to deve develo lop p TOW2 TOW2 gunn gunner er trac tracki king ng erro error r sign signal als. s. The The erro error r sign signal als s are are then then appli applied ed to the the inst instru ruct ctor or console console for for further further processi processing. ng. After After error error signals signals are proces processed sed they are applied to the score and line-of-sight (LOS) meters located on the front panel of the ICU.

Figure 4-3.

Instructor Console.

49

MM 48 11

Cable Set Case.

Figure 4-4.

Cable Set Case.

Connecting Cables.

Figure 4-5.

Connecting Cables. 50

MM 48 11

Battery Assemblies. Two nickel cadmium battery assemblies are issued with each training set. One battery battery assembly assembly provides provides power for for the instructo instructor r console. console. The other is a spare and can replace the first battery assembly if necessary. The battery assemblies are identical to one used with the TOW TOW miss missil ile e guid guidanc ance e set and are are rech recharg argea eabl ble e on the the TOW batte battery ry charger (Figure 4-6).

Figure 4-6.

Battery Assembly.

51

MM 48 11

Operation of the TOW2 Training Set. The target set (Figure 4-7) is mounted on a vehicle that is located at a realist istic distance nce from the gunne nner. The TOW gunner's performance in a tactical situation is measured and evaluated by the missile hitting hitting the target. However, However, in the the training training situation, situation, no missile missile is is actually actually fired fired. . Since Since you cannot cannot see see if the TOW TOW gunner gunner has hit the target, the evaluation of the gunner must be done by the training training equipment. equipment. The target target source source which simulates simulates the missile missile IR IR energy is located located on the the target. target. Therefore, Therefore, if the the TOW gunner gunner keeps keeps his line of sight on the target, the TOW2 system will believe the miss missil ile e is on targ target et and and no pitc pitch h or yaw yaw erro error r sign signal als s will will be generated by the missile guidance set. The instructor console of the training set, when connected to the missile guidance set of the TOW2 weap weapon on syste system, m, monit monitor ors s the the pitc pitch h and and yaw yaw erro error r sign signal als. s. The The instructor console then scores the TOW gunner's ability to keep the line of sight on targ arget. The train aining set must provide the foll followi owing ng: : targ target et, , missi missile le load loadin ing, g, miss missil ile e laun launch ch, , and and miss missil ile e flight.

Figure 4-7.

Tactical Training.

52

MM 48 11

Target. The training set target board (Figure 4-8) is used instead of the tactical tactical object object to provide provide the the target. target. The target target board board is normally normally mounted on a vehicle to provide a moving target.

Figure 4-8.

53

Target.

MM 48 11

Simulated Missile Flight. Since no missile missile is actually launched, the training set must simulate miss missil ile e feed feedba back ck to the the TOW2 TOW2 weapo weapon n syst system em. . Duri During ng a tact tactic ical al miss missile ile fligh flight t towar toward d a targe target, t, the the missi missile le send sends s IR energ energy y back back toward toward the the optical optical sight sight. . This This allows allows the missi missile le guidan guidance ce set to direct direct the the missile missile to the the target target. . The train training ing set set target target source source sends out the same IR energy as the tactical missile (Figure 4-9).

Figure 4-9.

Simulated Missile Flight.

The target source (Figure 4-10) has an IR lamp which sends out IR ener energy. gy. Power Power to run the power power suppl supply/ y/mod modul ulat ator or comes comes from from the vehicle vehicle batt battery ery. . Heat strip strips s on the target target board board make make the the target target visible to the night sight.

Figure 4-10.

Target Source. 54

MM 48 11

Simulated Missile Loading. The missil missile e simulat simulation ion round round (MSR)( (MSR)(Fig Figure ure 4-11), 4-11), a separat separate e issue issue item item, , is the the same same size size, , shape shape, , and appro approxi xima mate te weig weight ht as the the TOW TOW encased missile and is loaded exactly like the TOW tactical round..

Figure 4-11.

Simulated Missile Loading.

Simulated Missile Launch. The blast simulator (Figure 4-12), a separately issued item, is used to simul simulat ate e a miss missil ile e laun launch ch when when plac placed ed in the MSR. MSR. When When the the launcher trigger is pressed by the TOW gunner, the blast simulator explodes in the MSR simulating the sound of a tactical missile firing.

Figure 4-12.

Simulated Missile Launch. 55

MM 48 11

Separate Issue Items. Missile Simulation Round (MSR).

Figure 4-13.

Missile Simulation Round (MSR)

Blast Simulator.

Figure 4-14.

Blast Simulator.

56

MM 48 11

LESSON FOUR Practice Exercise The following items will test your grasp of the material covered in this lesson. lesson. There is only one correct correct answer for each item. When you have completed the exercise, check your answers with the answer key that that follow follows. s. If you answe answer r any item item incorrec incorrectly tly, , study study again again that part of the lesson which contains the portion involved. Situ Situat atio ion: n: You You have have been been aske asked d by a subo subord rdin inat ate e questions pertaining to the TOW2 training set. 1.

B. C. D.

Inst Instru ruct ctor or cons consol ole, e, batt batter erie ies, s, targ target et set set, , cable cable set set case, case, cables. Target set, missile guidance set, tripod, instructor console, and traversing unit. Inst Instru ruct ctor or cons consol ole, e, M70 M70 cabl cable e set, set, targ target et sour source ce, , miss missil ile e guidance set, and traversing unit. Target board, target source, battery assembly, missile guidance set, and tripod.

What What supp suppli lies es powe power r for for the the ins instr truc ucto tor r con conso sole le? ? A. B. C. D.

4.

Checkout the MGS. Evaluate ti timing ci circuits. TOW2 gunner training. Scores missile tracking.

What What majo major r ite items ms make make up the the M70 M70 trai traini ning ng set? set? A.

3.

foll follow owin ing g

What What is the the pur purpo pose se of the the TOW TOW trai traine ner? r? A. B. C. D.

2.

the the

Tactical vehicl icle batteries. Nick Nickel el cadm cadmiu ium m bat batte tery ry (TOW (TOW batt batter ery) y). . Missile guidanc ance set (MGS). Power supply modulator.

What What ite item m use used d with with the the tra train inin ing g set set is is a sepa separa rate te issue issue item item? ? A. B. C. D.

Missile si simulation ro round. M70E2 cable set. Instructor console. Target board.

57

MM 48 11

5.

What What is the the pur purpo pose se of of the the powe power r sup suppl ply/ y/mo modu dula lato tor? r? A. B. C. D.

6.

How How many many tra train inin ing g mode modes s can can be sele select cted ed usi using ng the the TOW TOW2 2 trai traini ning ng set? A. B. C. D.

7.

meter square. ft. square. in. square. in. square.

Power supply/modulator. Instructor console. Target set. Target so source.

What item firing? A. B. C. D.

10.

One One 576 157

What What item item of TOW TOW2 2 train trainin ing g equip equipme ment nt moni monito tors rs and and evalu evaluat ates es the the tracking performance of the gunner? A. B. C. D.

9.

4 3 2 1

What What is the the size size of the the targ target et boar board? d? A. B. C. D.

8.

Simulates infra frared target. Scores gu gunner's r's pe performance. Prov Provid ides es powe power r for for targ target et sour source ce. . Prov Provid ides es powe power r for for inst instru ruct ctor or con conso sole le. .

of

the

TOW2

training

equipment

simulates

missile

Battery assembly. Blast simulator. Target so source. Missile simulator round.

What is the the purp purpose ose of of the the heat heat strip strips s on the target target boar board? d? A. B. C. D.

Night si sight op operation. Optical sight operation. Instructor con cons sole op operation. Target source operation.

58

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THIS PAGE IS INTENTIONALLY LEFT BLANK

59

MM 48 11

LESSON FOUR PRACTICE EXERCISE ANSWER KEY AND FEEDBACK Item

Correct Answer and Feedback

1.

C.

TOW2 gunner training.

By using the TOW2 training equipment, the soldier does not need tactical rounds for training. (Page 47, para 2.) 2.

A. Instructor co console, set case, cables (3).

ba batteries

(2 (2),

ta t arge t

se set,

ca c able

Alth Althou ough gh ther there e are are many many majo major r item items s in a comp comple lete te weapon system the M70 training set consists of: instru instructo ctor r consol console, e, batteri batteries es (2), (2), target target set, set, cable cable case, and cables (3). (Page 47, para 3.) 3.

B.

TOW TOW the set

Nickel cadmium battery (TOW battery).

There are man many parts of the the TOW system and training equi equipm pmen ent t that that may may be oper operat ated ed from from vehi vehicl cle e powe power, r, the the instructor console requires batteries for operation. (Page 51, para 1.) 4.

A.

Missile simulation round.

The missile simulation round is used in TO W gunner training, but it is a separate issue item and is not part of the training set. (Page 56, para 1.) 5.

C.

Provides power for target source.

The The powe power r supp supply ly modu modulat lator or conv conver erts ts vehi vehicl cle e used by the target source. (Page 48, para 7.) 6.

C.

power power

to

be

2.

When When usin using g the the TOW2 TOW2 trai traini ning ng equi equipm pmen ent t you you may may sele select ct practice mode or qualification mode. (Page 47, para 2.) 7.

A. One meter square. The thermal target board is approximately approximately one meter square. (Page 48, para 2.) 60

MM 48 11

Item

Correct Answer and Feedback

8.

B.

Instructor console.

When the training set is in use, the instructor's console monitors monitors and evaluates evaluates the the gunner's gunner's perform performance. ance. (Page 52, para 1.) 9.

B.

Blast simulator.

The The miss missil ile e firi firing ng simu simula lati tion on is prod produc uced ed by the the simulator simulator during during the use use of the training training equipment. equipment. 55, para 2.) 10.

A.

blas blast t (Page

Night sight operation.

In order for the night sight to operate properly, it must be able to sense heat; therefore, therefore, the target board has heat stri strips ps to gene genera rate te heat heat for for the nigh night t sight sight. . (Pag (Page e 48, Figure 4-2.)

61

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LESSON FIVE TOW2 MAINTENANCE CONCEPT Soldier's Manual Task

093-411-3911 093-411-3915

OVERVIEW TASK DESCRIPTION: Dire Direct ct main mainte tena nance nce on the the TOW2 TOW2 Weap Weapon on Syst System em, , provide technical assistance to TOW2 repairers.

test test

equi equipme pment nt

and and

LEARNING OBJECTIVE: ACTION S:

When yo you ha have co completed th this le lesson yo you sh should be be ab able to iden identi tify fy the the main mainte tena nanc nce e conc concep ept t for for the the TOW2 TOW2 Weapon System.

CONDIT IONS:

You will have this without supervision.

STANDARD ARDS:

Identify TOW TOW2 mai maintenance co concept in in acc accordance wit with the information contained in this subcourse booklet.

REFE REFERE RENC NCES ES: :

The The mat mater eria ial l con conta tain ined ed in this this less lesson on was was der deriv ived ed from from the following publications: TM 9-4935-484-14. TM 9-1425-450-12. TC 23-24.

subcourse

book,

and

wil l

work

INTRODUCTION The effectiveness of any missile system depends upon the maintenance program. program. The TOW2 TOW2 Weapon Weapon System System maintenance maintenance program program will consist of unit, unit, interm intermedi ediate ate (DS/GS (DS/GS), ), and depot depot mainten maintenanc ance. e. This This lesson lesson outline outlines s the three three levels levels and an overvi overview ew of the respons responsibi ibilit lities ies, , and and the the test test, , meas measur urem emen ent t and and diag diagno nost stic ic equi equipm pmen ent t requ requir ired ed to perform these tasks.

62

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TOW2 Maintenance Concept. The TOW2 Weapon System emplo ploys a combination of maintenance procedur dures. Some of these procedures are done at the unit, intermed mediate DS/GS support and depot. In this lesson each maintenance level will be explained as to what level of maintenance does does what proce procedur dure. e. Mainten Maintenanc ance e allocat allocation ion chart charts s (MAC) (MAC) must be used to determine who performs what maintenance function. Unit Maintenance. Unit maintenance is the responsibility of and is performed by a using orga organi niza zati tion on on its its assi assign gned ed equi equipm pmen ent t (Fig (Figur ure e 5-1) 5-1). . At the the organiz organizati ationa onal l mainten maintenanc ance e level, level, the user user can perfor perform m the system system self-test, the boresight alignment check, and preventive maintenance procedures, and may replace any assembly shown to be defective by the self-test. Unit missile maintenance operations are characterized by: 1. 2. 3. 4. 5.

Gene General ral clea cleani ning ng of of TOW2 TOW2 Wea Weapo pon n Syst System em. . Perf Perfor orm m TOW2 TOW2 Weap Weapon on Syst System em prev preven enti tive ve main mainte tena nanc nce e service (PMCS). Notify direct support to perform semi-annual verification. Perf Perfor orm m spot spot pain painti ting ng. . Perf Perform orm syst system em che check ckou out t proc proced edur ures es. .

Figure 5-1.

chec checks ks or

and and

annual

Unit Equipment.

63

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Intermediate Maintenance (Direct Support/General Support) (DS/GS). The The inte interme rmedi diat ate e main mainte tena nanc nce e units units will will prov provid ide e for for chec checko kout ut and and faul fault t isol isolat atio ion n for for the TOW2 TOW2 Weap Weapon on System System. . Main Mainte tena nanc nce e supp suppor ort t equipment equipment includes the Land Combat Support System (LCSS), the Contact Support Set (CSS), the Improved Contact Support Set (ICSS), and the TOW Field Test Set (TFTS). The The repa repairm irman an will will repa repair ir, , alin aline, e, and and cali calibra brate te modu module les, s, prin printe ted d circuit circuit cards, cards, and boards boards constr construct ucted ed with with only only conven conventio tional nal piece piece parts. parts. Unserv Unservicea iceable ble modul modules, es, cards cards, , and boards boards const construct ructed ed with with solid state elements or a combination combination of solid state and conventional conventional piec piece e part parts s are are evac evacuat uated ed to the the desi designa gnate ted d depo depot t for for repa repair ir and and retu return rn to stoc stock. k. Inte Interm rmed ediat iate e DS/GS DS/GS main mainte tena nance nce oper operat ation ions s are characterized by: 1.

Providi Providing ng Battle Battle Damage Damage Assess Assessmen ment t (BDA (BDA) ) teams teams. .

2.

Providi Providing ng and main maintai taining ning an an Operati Operationa onal l Readine Readiness ss Float Float (ORF). (ORF).

3.

Prov Providi iding ng a tech techni nica cal l supp supply ly sys syste tem. m.

4.

Prov Providi iding ng mainte maintena nanc nce e supp suppor ort t team teams s to assist assist techni technici cian ans s at the user level in performing unit maintenance.

5.

Providi Providing ng shop shop suppor support t for LRU LRU repair repair and and LRU Dire Direct ct Exchan Exchange ge (DX) (DX) for all missile systems in the division.

6.

Prov Providi iding ng con conta tact ct Sup Suppor port t Team Teams s (CSS (CSS). ).

7.

Evac Evacua uati ting ng unse unserv rvic icea eabl ble e PCB' PCB's s and and suba subass ssem embl blie ies s intermediate GS/Depot level repair facilities.

64

dire direct ctly ly

to

MM 48 11

DS/GS Equipment.

Figure 5-2.

DS/GS Equipment.

65

MM 48 11

Depot Maintenance Equipment. Annisto Anniston n Army Army Depot Depot in Annist Anniston, on, Alabam Alabama, a, is the depot depot mainte maintenan nance ce faci facilit lity y char charge ged d with with hand handli ling ng the the over overflo flow w from from Gene Genera ral l Supp Suppor ort t units. units. At this mainte maintenan nance ce facilit facility y unservic unserviceab eable le modules modules, , cards, cards, and boards constructed with solid state elements or a combination of solid state and conventional conventional piece parts are repaired repaired and returned returned to stock. As a general rule, the depot activity repairs those items for whic which h supp suppor ort t unit units s lack lack the the prop proper er main mainte tena nanc nce e faci facili liti ties es or expertise. Depot maintenance operations are characterized by: 1.

Providi Providing ng the the interf interface ace betwe between en depot depot and and DS/GS DS/GS missi missile le units. units.

2.

Routing Routing repair repaired ed items items into into the supply supply system. system.

3.

Receivin ving, scree reening and and routing ing appropriate repair facility.

4.

Perf Perform ormin ing g diag diagno nosi sis s and rep repai air r of SRU SRU's. 's.

5.

Repairi Repairing ng of compon component ents, s, assem assembli blies, es, PCB's PCB's, , and DX items items. .

6.

Providi Providing ng miss missile ile repair repair part parts s suppl supply y for the theate theater. r.

Figure 5-3.

all

incoming

items

to

the

Depot Equipment.

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LESSON FIVE Practice Exercise The following items will test your grasp of the material covered in this lesson. lesson. There is only one correct correct answer for each item. When you have completed the exercise, check your answers with the answer key that that follow follows. s. If you answe answer r any item item incorrec incorrectly tly, , study study again again that part of the lesson which contains the portion involved. Situ Situat atio ion: n: You You have have been been aske asked d by a subo subord rdin inat ate e the the questions pertaining to the TOW2 Weapon System maintenance.

foll follow owin ing g

1.

What What A. B. C. D.

leve level l of of mai maint nten enan ance ce repa repair irs s SRU' SRU's? s? Depot. Unit. Unit and DS. Intermediate DS.

2.

What What A. B. C. D.

leve level l of of mai maint nten enan ance ce repa repair irs s LRU' LRU's? s? Depot. Unit. Intermediate DS. Unit and depot.

3.

What What A. B. C. D.

main mainte tena nanc nce e leve level( l(s) s) main mainta tain in an ORF? ORF? Depot. Unit. Intermediate. Organizationa l.

4.

What What is is the the purp purpose ose of the the mai maint nten enanc ance e all alloc ocat atio ion n char chart? t? A. Dete Determ rmin ines es who who per perfo form rms s what what mai maint nten enan ance ce fun funct ctio ion. n. B. Dete Determ rmin ines es if orga organi niza zati tion onal al unit units s can can prov provid ide e addi additi tion onal al parts. C. Used Used for for tro troubl ubles esho hoot otin ing g fau faults lts in the the TOW TOW2 2 Weap Weapon on Syst System em. . D. Shows wh what par part ts ca can be be or ordered. ed.

5.

What What A. B. C. D.

are are the the lev levels els of main mainte tena nanc nce e for for the the TOW2 TOW2 Weapo Weapon n Sys Syste tem? m? GS, DS, unit. Unit, DS DS/GS, an and de depot. Depot, intermed mediate, and GS. Unit, GS, and depot.

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6.

What What leve level l of maint mainten enan ance ce pro provi vide des s cont contac act t supp suppor ort t team teams s (CSS (CSS)? )? A. B. C. D.

7.

What What main mainte tena nanc nce e level level prov provid ides es Batt Battle le Damag Damage e Asses Assessm smen ent t (BDA (BDA) ) teams? A. B. C. D.

8.

Depot. Unit. Intermediate. Intermediate an and un unit.

At what what lev level el of mai maint nten enan ance ce are are che check ckou out t and and fault fault iso isola lati tion on of the TOW2 Weapon System SRU's performed? A. B. C. D.

10. 10.

Unit. Depot. Intermediate. Unit and depot.

What What main mainte tena nanc nce e faci facili lity ty pro provi vide des s repa repair ir par parts ts to to the the thea theate ter? r? A. B. C. D.

9.

Intermediate DS. Depot. Unit. GS.

Organizationa l. Direct support. Depot. Unit.

What What main mainte tena nanc nce e faci facili lity ty(s (s) ) prov provid ide e annu annual al or verification of the TOW2 Weapon System components? A. B. C. D.

semi semi-a -ann nnua ual l

Unit. Depot. Intermediate DS. Organizationa l.

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LESSON FIVE PRACTICE EXERCISE ANSWER KEY AND FEEDBACK Item

Correct Answer and Feedback

1.

A.

Depot.

System SRU's are repaired at the depot level and returned to the supply system. (Page 66, para 4.) 2.

C.

Intermediate DS.

The LRU's for the TOW2 weapon system are repaired at the intermediate DS maintenance facility. (Page 64, para 5.) 3.

C.

Intermed iate.

A system operational operational readiness float (ORF) is maintained maintained at the intermediate maintenance level. Page 64, para 2.) 4.

A.

Determines who performs what maintenance function.

The maintenance allocation allocation chart has listed the information that that dete determ rmin ines es what what main mainte tena nanc nce e leve level l perf perfor orms ms what what maintenance function. (Page 63, para 1.) 5.

B.

Unit, DS/GS, depot.

The TOW2 weapon system, like many other land combat weapon systems has three levels of maintenance. (Page 63, para 1.) 6.

A.

Intermediate DS.

In the maintenance support of the TOW2 weapon system the interm intermedi ediate ate DS mainte maintenanc nance e provid provides es the using using unit unit with contact support teams. (Page 64, para 6.) 7.

C.

Intermed iate.

The interme intermedia diate te mainten maintenanc ance e level level provid provides es to the using using unit Battle Damage Assessment Assessment (BDA) (BDA) teams. (Page 64, para para 1.)

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Item

Correct Answer and Feedback

8.

A.

Depot.

The theate theater r is suppli supplied ed repair repair parts parts by the the depot. depot. 66,. para 6.) 9.

C.

(Page (Page

Depot.

The depot performs the checkout and fault isolation of the weapon systems SRU's. (Page 66, para 4.) 10.

C.

Intermediate DS.

The depot facility facility provides provides semi-annual semi-annual verification verification of the TOW2 weapon system components. (Page 63, para 3.)

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