DOC AIRBUS | AMM A320FProcedure for a Bowed Rotor Start Prevention [IAE]
TASK 71-00-00-700-016-A
Procedure for a Bowed Rotor Start Prevention
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 71-00-00-869-144-A ** ON A/C NOT FOR ALL
Subtask 71-00-00-869-145-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:28:12 UTC
Procedure for a Bowed Rotor Start Prevention
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| 98F10103500000 | 2 | CHOCK-MLG,ENGINE RUN-UP |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-00-00-710-043-A | Normal Engine Automatic-Start Procedure |
| TASK 71-00-00-710-047-A | Normal Engine Manual-Start Procedure |
| TASK 71-00-00-860-010-B | Engine Operation Limits, Guidelines and Special Procedures |
| TASK 71-00-00-860-012-A | Engine Safety Precautions |
Tool InstallationSubtask 71-00-00-869-144-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) Make sure that 98F10103500000 CHOCK-MLG,ENGINE RUN-UP are in position in front of each forward outboard MLG- wheel.
(a) If, after the engine start, you must operate the engine at high power, use the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP.
1 Put the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP in position against the wheel.
2 Pull up the tow bar in the top position until it touches the weld stops.
(3) If the aircraft starts to move while you do an engine run, immediately set all the thrust levers to the idle position.
4. Procedure(1) Make sure that 98F10103500000 CHOCK-MLG,ENGINE RUN-UP are in position in front of each forward outboard MLG- wheel.
(a) If, after the engine start, you must operate the engine at high power, use the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP.
1 Put the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP in position against the wheel.
2 Pull up the tow bar in the top position until it touches the weld stops.
NOTE: For general information refer to the engine safety precautions (Ref. AMM TASK 71-00-00-860-012) and engine operation limits, guidelines and special procedures (Ref. AMM TASK 71-00-00-860-010).
(2) There must be two approved persons in the cockpit when you do an engine run at more than idle. One must monitor the outside and the aircraft while the other one does the engine test. (3) If the aircraft starts to move while you do an engine run, immediately set all the thrust levers to the idle position.
Subtask 71-00-00-869-145-A ** ON A/C NOT FOR ALL
A. Usual Engine Shutdown
(1) A shutdown which incorporates a cool-down of the engine at idle before a shutdown, is considered a usual shutdown. The guidelines that follow give usual engine shutdown.
(2) Operate the engine at MIN IDLE for three minutes before you do an engine shutdown. If you operated the engine at high power (more than 1.33 EPR) for more than five minutes, increase the time at MIN IDLE to Fifteen minutes before shutdown.
The time at MIN IDLE shall not be less than three minutes before engine shutdown.
Subtask 71-00-00-869-147-A ** ON A/C NOT FOR ALL (1) A shutdown which incorporates a cool-down of the engine at idle before a shutdown, is considered a usual shutdown. The guidelines that follow give usual engine shutdown.
(2) Operate the engine at MIN IDLE for three minutes before you do an engine shutdown. If you operated the engine at high power (more than 1.33 EPR) for more than five minutes, increase the time at MIN IDLE to Fifteen minutes before shutdown.
The time at MIN IDLE shall not be less than three minutes before engine shutdown.
B. Emergency Shutdown
(1) An emergency shutdown is a shutdown from power levels higher than MIN IDLE and the engine was not cooled down at IDLE first.
Subtask 71-00-00-869-148-A ** ON A/C NOT FOR ALL (1) An emergency shutdown is a shutdown from power levels higher than MIN IDLE and the engine was not cooled down at IDLE first.
C. Procedure after an Emergency Shutdown
(1) Do the steps that follow for engines that will be started again in 15 minutes of the last engine shutdown.
(a) Immediately after FUEL OFF mode, engage the starter below 1490 RPM (10 percent) to continue the rotation of the engine.
(b) Motor the engine at more than 2500 N2 RPM (16.8 percent) until the EGT decreasesbelow 482 deg.F (250.00 deg.C) or for two minutes. Use the one that is less.
(c) Start the engine again in less than 15 minutes (Ref. AMM TASK 71-00-00-710-043) or (Ref. AMM TASK 71-00-00-710-047).
(d) Keep the power at MIN IDLE for 15 minutes before you move the thrust lever forward. You can continue usual operation after 15 minutes at MIN IDLE.
(2) Do the steps that follow for engines that will be started again 15 minutes or more after the last engine shutdown.
(a) Start the engine again after six hours from the last engine shutdown or turn the HP compressor as follows:
1 Turn the HP compressor (use the gearbox crank pad and a torque wrench) 180 degrees each half hour for up to a maximum of six hours. Do not use more than 500 lbf.in (5.65 m.daN) of torque.
(c) If the rotor cannot be turned (more than 500 lbf.in (5.65 m.daN) ) of torque is necessary), do the steps that follow:
1 Try to turn the rotor each one half hour until the rotor is free.
2 Turn the rotor 180 degrees (one third turn clockwise when you look from the front of the gearbox).
3 Start the engine again one hour after the last rotor turn (Ref. AMM TASK 71-00-00-710-043) or (Ref. AMM TASK 71-00-00-710-047).
(d) Operate the engine at MIN IDLE for a minimum of 15 minutes before you increase thrust.
(1) Do the steps that follow for engines that will be started again in 15 minutes of the last engine shutdown.
(a) Immediately after FUEL OFF mode, engage the starter below 1490 RPM (10 percent) to continue the rotation of the engine.
(b) Motor the engine at more than 2500 N2 RPM (16.8 percent) until the EGT decreasesbelow 482 deg.F (250.00 deg.C) or for two minutes. Use the one that is less.
(c) Start the engine again in less than 15 minutes (Ref. AMM TASK 71-00-00-710-043) or (Ref. AMM TASK 71-00-00-710-047).
(d) Keep the power at MIN IDLE for 15 minutes before you move the thrust lever forward. You can continue usual operation after 15 minutes at MIN IDLE.
(2) Do the steps that follow for engines that will be started again 15 minutes or more after the last engine shutdown.
(a) Start the engine again after six hours from the last engine shutdown or turn the HP compressor as follows:
1 Turn the HP compressor (use the gearbox crank pad and a torque wrench) 180 degrees each half hour for up to a maximum of six hours. Do not use more than 500 lbf.in (5.65 m.daN) of torque.
NOTE: One third turn clockwise (when you look from the front of the gearbox) on the gearbox crank pad is equal to 180 degrees of rotor rotation.
(b) Between 10 and 20 minutes after the last manual rotor turn, before you try an engine start, the HP rotor must be free (less than 500 lbf.in (5.65 m.daN) ) of torque is necessary to turn the rotor 360 degrees). If the rotor is free, you can start the engine again (Ref. AMM TASK 71-00-00-710-043) or (Ref. AMM TASK 71-00-00-710-047). (c) If the rotor cannot be turned (more than 500 lbf.in (5.65 m.daN) ) of torque is necessary), do the steps that follow:
1 Try to turn the rotor each one half hour until the rotor is free.
2 Turn the rotor 180 degrees (one third turn clockwise when you look from the front of the gearbox).
3 Start the engine again one hour after the last rotor turn (Ref. AMM TASK 71-00-00-710-043) or (Ref. AMM TASK 71-00-00-710-047).
(d) Operate the engine at MIN IDLE for a minimum of 15 minutes before you increase thrust.