Leap-1a Operating Limits

LEAP-1A-72-00-00-01A-340C-C

ENGINE ASSEMBLY

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TEST 001 - OPERATING LIMITS

7.

References......................................................................................................................................... 1 Required conditions........................................................................................................................... 2 Support equipment.............................................................................................................................2 Consumables, materials and expendables....................................................................................... 2 Spares................................................................................................................................................ 2 Procedure...........................................................................................................................................2 A. General........................................................................................................................................2 B. Limits........................................................................................................................................... 2 Requirements after job completion..................................................................................................11

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1. 2. 3. 4. 5. 6.

List of tables

Reason(s) for update.............................................................................................................. 1 References...............................................................................................................................1 Oil pressure corrections for core speed and oil temperature..................................................4

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Table: Table: Table 1:

List of figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Oil pressure corrections for core speed and oil temperature................................................12 Temperature limits (except starts).........................................................................................13 Vibration limits/guidelines...................................................................................................... 14 Minimum idle limits................................................................................................................15 LEAP-1A low oil pressure limit............................................................................................. 16

Reason(s) for update

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printed from DVD LEAP CFM-TP-610-A-S1000D 2016-10-01 - [printed on 2017-01-25]

Table of contents

Table: Reason(s) for update Changed the procedure to do an operating limits test.

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1. References

Table: References

Technical publication LEAP-1A-72-00-00-01A-320B-C LEAP-1A-72-00-00-01A-420B-C

Applicability: All

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© CFM PROPRIETARY INFORMATION: Subject to the restrictions on the cover or first page

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2. Required conditions

No support equipment

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3. Support equipment

4. Consumables, materials and expendables No supplies

5. Spares No spares

Safety conditions

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No safety conditions

6. Procedure A.

General

The limits in this procedure are applicable for all engine tests. The operator must know all of these limits before engine operation.

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Note: You can use equivalent alternatives for standard tools, equipment and consumable materials.

B.

Limits

Starter limits:

(a)

The starter duty cycle permits maximum continuous operation for 5 minutes.

(b)

The starter must then be cooled for a minimum of 5 minutes.

(c)

After two consecutive 5 minute duty cycles, wait 15 minutes to let the starter cool before the 5 minute duty cycle is repeated.

(d)

If the attempted start time is less than 2 minutes, then a 60 second rest interval is necessary between attempted starts.

(e)

After three consecutive attempted starts of less than 2 minutes, the starter must be cooled for 15 minutes before additional star cycles are attempted.

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(1)

Applicability: All

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No required conditions

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(f)

Engine start time: Time to light-off

(b)

The Full authority Digital Engine Control (FADEC) will automatically motor the engine between 20% and 30% N2 for up to 55 seconds in order to mitigate bowed rotors. After completion of bowed rotor motoring, fuel will be introduced. Light-off should occur in 2 - 3 seconds after fuel is introduced. If light-off does not occur within 15 seconds, place fuel shut-off lever to OFF, continue to motor engine with starter for 30 seconds, then de-energize starter. Refer to: LEAP-1A-72-00-00-01A-320B-C

Start to minimum idle

Requirements: The engine must start and accelerate to minimum idle minus the calculated bowed rotor time in a standardized time not greater than the times shown below: (a) 75 seconds when -4 °F (-20 °C) < Tamb < 104 °F (40 °C) (b) 105 seconds when Tamb >104 °F (40 °C) or -40 °F (-40 °C) < Tamb < (-4 °F) (-20 °C)

(3)

Time to idle must be measured from the initial rotation of the HP rotor to the time where the minimum of the minimum idle speed is reached. Bowed rotor motoring time must be calculated as time between when the HP rotor reaches 20 percent N2 until the fuel introduced and igniters are commanded on. The time start to be considered occurs when SAV opens

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Remarks:

Ignition systems:

(a)

Duty cycle

Requirements: Continuous use is permitted

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Remarks:

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(a)

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(2)

Do not engage the starter when the core speed is more than 20 percent.

Remarks:

(4)

Rotors do not turn:

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(a)

Applicability: All

Make a minimum of one start on each system during the test schedule. The maximum ignition unit environmental temperature must not be more than 225 °F (107 °C) with continuous ignition

Fan (N1): Core engine operation with fan rotor or low pressure turbine (LPT) rotor seized Requirements: Maximum permitted core engine speed is the maximum motoring speed Remarks:

Do not operate the engine without an N1 rotation indication. Set the master lever to OFF and the mode selector to NORMAL. Do not try to start the engine. Do troubleshooting to find the cause

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(b)

Core (N2): Core seized because of seal or shroud interference, or starter shaft is sheared

Lubrication system:

(a)

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CAUTION: SHUT DOWN THE ENGINE IF THERE IS ANY CHANGE OF 5 PSI (34 KPA) DURING STEADY-STATE OPERATION. DO TROUBLESHOOTING TO FIND THE CAUSE. ENGINE DAMAGE CAN OCCUR IF THE ENGINE IS OPERATED WITH THIS DEFECT. Oil Pressure

Note: The corrected oil pressure equals the engine inlet oil pressure minus

the sump internal (AGB internal) pressure (delta P given by FADEC parameter 1/4 ARINC label 317) plus the oil correction factor. Table 1 and Figure 1.

Note: The oil correction factors are derived from the physical core speed

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(ARINC label 344) and the selected engine oil temperature (ARINC label 316).

Table 1: Oil pressure corrections for core speed and oil temperature Correction Deltas (kPa)

YTEOSL*(degC)\N2 15000 (rpm)

15500

16000

16500

17000

17500

18000

18500

19000

60

19

-23

-67

-113

-159

-206

-254

101

122 °F (50 °C)

151

112

73

33

-9

-53

-96

-141

-187

140 °F (60 °C)

180

144

106

69

30

-11

-52

-94

-136

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104 °F (40 °C)

158 °F (70 °C)

210

176

140

105

67

29

-10

-50

-91

176 °F (80 °C)

239

207

174

141

106

70

34

-4

-42

194 °F (90 °C)

264

234

204

173

141

106

72

38

2

Applicability: All

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(5)

Do not try to start the engine until core rotor turns freely. If engine is cold, troubleshoot starter

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Remarks:

LEAP-1A-72-00-00-01A-340C-C Correction Deltas (kPa) 15500

16000

16500

17000

17500

18000

18500

19000

144

112

80

47

175

146

116

85

288

261

232

204

174

230 °F (110 °C)

310

284

258

232

204

248 °F (120 °C)

332

307

282

257

231

204

177

149

121

266 °F (130 °C)

351

328

305

281

256

231

205

179

153

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212 °F (100 °C)

The correction factor is shown in the equation that follows: Corrected oil pressure = label (317) + correction factor Where correction factor = correction factors derived from Table 1 with physical core speed in rpm (label 344) and the oil temperature in degC (label 316). During start up to minimum idle (N2 below 10000 rpm)

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2

Requirements: Positive indication (oil pressure label 317) above 3000 rpm (N2)

3

At stabilized minimum idle and above Requirements Oil pressure (label 317) above low oil pressure limit Figure 5 for real time survey:

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Requirements Oil Pressure corrected in the range94.27 psig (650 kPa) +/at study state 15.23 psig (105 kPa) diffFigure 5 thrust rating acceptance criteria (5mn stabilized):

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YTEOSL*(degC)\N2 15000 (rpm)

(b)

Applicability: All

Remarks:

4

If not within limits, examine and correct the cause before operation at higher speeds

At stabilized minimum idle Remarks:

If not in limits, examine and correct the cause before operation at higher speeds

Requirements: Type 2 oil cannot be less than low oil pressure limits Figure 5 Oil temperature:

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Maximum stabilized oil temperature at engine inlet Requirements: 284 °F (140 °C) maximum Decrease the power until the temperature is in limits. If it is more than 284 °F (140 °C) for 5 minutes, shut down the engine and examine it to find the cause. High scavenge oil temperature can be an indication of lube system problems

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Remarks:

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Maximum transient oil temperature at engine inlet

(c)

Oil consumption

Requirements: 0.09 galUS/hr (0.3 L/h) maximum Remarks:

(6)

This limit is necessary to make sure that the engine will not use more than the operational consumption rate when it is installed

Fuel system:

(a)

Fuel flow

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Requirements: 200 pph ( 90 kg/h) to 300 pph (136 kg/h) during start Remarks:

(b)

Fuel flow more than 300 pph (136 kg/h) can cause you to go above the EGT limits

Fuel inlet pressure

Requirements: 15 psig (103 kPa) to 70 psig (482 kPa) Remarks:

Facility flow verification

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(c)

At the inlet to the fuel pump during all test modes to include transients

Requirements: The two facility fuel flow meters must not be more than 0.5 percent different

Under-cowl air temperature limits:

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(7)

(a)

All test operations

Requirements: If temperature exceeds 450 °F (232 °C) maximum forward of station 228 or 600 °F (315 °C) aft of station 228, the engine must be checked for air leaks. Remarks:

Applicability: All

You must monitor under-cowl temperatures during break-in and all test operations. If temperatures are not in limits, examine the engine for air leaks. Correct all air leaks and continue the test run. If temperature exceeds 500 °F (260 °C) maximum forward

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Requirements: 311 °F (155 °C)

LEAP-1A-72-00-00-01A-340C-C of station 228 or 700 °F (371 °C) aft of station 228, shutdown the engine and notify the test engineer for disposition. Exhaust Gas Temperature (EGT):

(a)

Start

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(8)

Requirements: 1382 °F (750 °C) maximum All other operations

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(b)

Requirements: Not more than the limits. Figure 2. shunt values.

(9)

Vibration Levels, apply vibration limits as follows: Figure 3.

(a)

Fan/LPT Rotor (N1)

Requirements: Figure 3 for limits.

(b)

The LP/REV vibration levels are for the No. 1 bearing vertical and turbine center frame sensors. Figure 3. If you go over the 2.5 Mils DA*, even after fan trim balancing procedure, send the engine to the shop. *: In case of transient with high acceleration/deceleration rate (30 seconds or less between idle and maximum reached regime), the maximum permitted vibration level is 4 Mils DA

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Remarks:

Core Engine Rotor (N2)

Requirements: Figure 3 for limits.

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Remarks:

The HP/REV vibration levels are for the No. 1 bearing vertical and turbine rear frame sensors. Figure 3. If you go over the 1.2 ips acceptance limit, send the engine to the shop

(10) Oil leakage: (a)

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Note: EGT values are shunted. Refer to: LEAP-1A-72-00-00-01A-320B-C for

(b)

(c)

Applicability: All

Starter pad

Requirements: No leaks are permitted Remarks:

Replace the magnetic seal

Rear hydraulic pump pad Requirements: 1.0 ml/hour/pad Remarks:


Fuel pump pad

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LEAP-1A-72-00-00-01A-340C-C Requirements: 1.0 ml/hour/pad Remarks: Forward sump

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(d)


Requirements: 5.0 ml/hour

(e)

AGB/IDG pad


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Remarks:

Remarks:

(11) Fuel leakage: (a)

VSV actuator


Requirements: 0.1 ml/min per actuator Remarks: VBV motor

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(b)

Replace the defective component

Requirements: 0.1 ml/min per actuator Remarks:

(c)

Replace the VBV motor

Fuel pump at drive pad

Requirements: 0.1 ml/min per actuator Remarks:

Heat exchanger

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(d)

Replace the fuel pump

Requirements: 0.1 ml/min Remarks:

High Pressure Turbine (HPT) clearance control valve

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(e)

Replace the heat exchanger

Requirements: 0.1 ml/min per valve Remarks:

(f)

Replace the HPT clearance control valve

Low Pressure Turbine (LPT) clearance control valve


Applicability: All

Replace the LPT control valve

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Requirements: 1.0 ml/hour/pad

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(g)

Transient Bleed Valve Requirements: 0.1 ml/min per valve

(h)

Replace the transient bleed valve

Starter Bleed Valve

Remarks: MTC Valve

Replace the starter bleed valve


(12) Idle stabilization time: (a)

After a start

Replace the MTC valve

Requirements: 10 minutes minimum

Before shutdown

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(b)

If an emergency occurs, do an engine shutdown procedure immediately . Refer to: LEAP-1A-72-00-00-01A-320B-C. After a shutdown from high power, without benefit of a 10 minute stabilization period at idle, the core rotor will probably seize. Do not air motor to cool the engine. After shutdown the engine must remain static for a minimum of 4 hours. Before a restart is attempted, the core must be free to turn. If the shutdown was inadvertent and no danger exists for the engine or facility, the engine can be immediately restarted and cooled at idle or the testing continued. Do not motor the engine to cool it after an emergency shutdown

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Remarks:

Requirements: 10 minutes minimum Remarks:

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(i)

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Requirements: 0.1 ml/min

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Remarks:

If an emergency occurs, do an engine shutdown procedure immediately . Refer to: LEAP-1A-72-00-00-01A-320B-C. After a shutdown from high power, without benefit of a 10 minute stabilization period at idle, the core rotor will probably seize. Do not air motor to cool the engine. After shutdown the engine must remain static for a minimum of 4 hours. Before a restart is attempted, the core must be free to turn. If the shutdown was inadvertent and no danger exists for the engine or facility, the engine can be immediately restarted and cooled at idle or the testing continued. Do not motor the engine to cool it after an emergency shutdown

(13) Rotor Speeds:

Applicability: All

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(a)

High pressure rotor (N2):

1

Minimum idle Requirements:

2

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Requirements: Figure 5 Maximum speed

(b)

If your speed is more than this limit, do an overspeed inspection

Low pressure rotor (N1):

1

Maximum speed

Requirements: 3894 rpm (100 percent = 3856 rpm) Remarks:

If your speed is more than this limit, repair the cause

(14) Variable Stator Vane (VSV) schedule

Monitor ARINC Label 275 Bit 20. Read on the ARINC bus

Remarks:

If Bit 20 is set, the VSV did not track correctly at the time. Do troubleshooting of the VSV system

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Requirements:

(15) Variable Bleed Valve (VBV) schedule Requirements:

Monitor ARINC Label 275 Bit 18. Read on the ARINC bus

Remarks:

If Bit 18 is set, the VBV did not track correctly at that time. Do troubleshooting of the VBV system

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(16) High Pressure Compressor (HPC) discharge pressure: (a)

Minimum idle

Requirements: Figure 5

(17) Ratings:

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(a)

Takeoff power setting

Requirements: Maximum of 5 minutes

(b)

Maximum continuous

Requirements: Continuous

(18) Nozzle areas (test):

Applicability: All

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Remarks:

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Requirements: 19391 rpm (100 percent = 16645 rpm)

LEAP-1A-72-00-00-01A-340C-C

(a)

Fan Area Requirements: 2533.4 in2 (16344 cm2) ± 0.5 percent

(b)

Measured cold

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Remarks: Core Area

Remarks:

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Requirements: 533.8 in2 (3443 cm2) ± 0.5 percent Measured cold

Requirements:

213 °F (101 °C) maximum

Remarks:

Remove power to the ECU when the engine is not in operation

(20) Fault Monitoring Requirements:

Monitor channels A and B of the EEC and ARINC output bus. Refer to: LEAP-1A-72-00-00-01A-420B-C.

Remarks:

Correct the faults before you continue the test

(a)

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(21) Dry-motoring for Engine Cooling: Start

Requirements: Dry-motor for approximately 90 seconds before start if the engine was operated during the previous 2 hours Remarks:

(b)

Obey the starter limits. Refer to Step 6.B.(1)

Shutdown

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Requirements: Dry-motor for a minimum of 2 minutes after the core stops or until the EGT is less than 212 °F (100 °C). Remarks:

Obey the starter limits. Refer to Step 6.B.(1)

7. Requirements after job completion

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(19) Engine Control Unit (ECU) Temperature

No required conditions after job completion

Applicability: All

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Oil pressure corrections for core speed and oil temperature Figure 1

Applicability: All

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Applicability: All

Temperature limits (except starts) Figure 2

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Vibration limits/guidelines Figure 3

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Applicability: All

Minimum idle limits Figure 4

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LEAP-1A low oil pressure limit Figure 5

LEAP-1A-72-00-00-01A-340C-C

Applicability: All

End of data module © CFM PROPRIETARY INFORMATION: Subject to the restrictions on the cover or first page

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LEAP-1A-72-00-00-01A-340C-C

Leap-1a Operating Limits

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