DOC AIRBUS | AMM A320FInstallation of the Permanent Magnet Alternator (PMA) Rotor [PW11]
TASK 73-21-05-400-801-A
Installation of the Permanent Magnet Alternator (PMA) Rotor
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 73-21-05-941-051-A ** ON A/C NOT FOR ALL
Subtask 73-21-05-410-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:02:50 UTC
Installation of the Permanent Magnet Alternator (PMA) Rotor
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.
FIN: 4020EV ** ON A/C NOT FOR ALL
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | MIRROR - INSPECTION |
| No specific | Torque wrench: range to between 300 and 270 lbf.in (3.39 and 3.05 m.daN )  | |
| PWA211435 | 1 | ADAPTER, TORQUE |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1) | |
| 437AL, 438AR, 451AL | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2) | |
| 447AL, 448AR, 461AL | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-00-00-720-811-A | Test No. 3A - Idle Power Test |
| TASK 71-00-00-860-832-A | Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC |
| TASK 71-13-00-010-802-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-802-A | Closing of the Fan Cowl Doors |
| TASK 73-21-04-400-801-A | Installation of the Permanent Magnet Alternator (PMA) Stator |
| TASK 73-25-34-400-802-A | Installation of the Engine Interface Unit (EIU) |
| TASK 78-30-00-040-805-A | Deactivation of the Thrust Reverser System for Ground Maintenance |
| TASK 78-30-00-440-805-A | Reactivation of the Thrust Reverser System after Ground Maintenance |
| TASK 78-36-00-010-802-A | Opening of the Thrust Reverser Cowl-Doors |
| TASK 78-36-00-410-802-A | Closing of the Thrust Reverser Cowl-Doors |
Installation of the Permanent Magnet Alternator (PMA) RotorSubtask 73-21-05-941-051-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832)
Subtask 73-21-05-010-052-A ** ON A/C NOT FOR ALL (1) Make sure that you did the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832)
B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
Subtask 73-21-05-040-051-A ** ON A/C NOT FOR ALL (1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
C. Deactivation of the Thrust Reverser System for Maintenance
Subtask 73-21-05-010-053-A ** ON A/C NOT FOR ALL WARNING:
YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
(1) Make sure that you did the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805). D. Get Access
(1) Make sure that the left thrust-reverser cowl-door is open (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL
4. Procedure(1) Make sure that the left thrust-reverser cowl-door is open (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL
CAUTION:
WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
Subtask 73-21-05-420-050-A ** ON A/C NOT FOR ALL A. Installation of the Permanent Magnet Alternator (PMA) Rotor
(1) Removal of protection covers
(2) Install the PMA rotor (2) on the shaft as follows:
1 Find the larger Inner Diameter (ID) of the slinger (3).
2 Install the slinger (3) to the shaft with the larger ID to face aft.
(d) Ensure that the two flats in the inner diameter of the PMA rotor are aligned with the two flats on the shaft before you torque the nut.
(e) Install the PWA211435 ADAPTER, TORQUE to the nut (1) and the main gearbox with the three captive bolts.
(f) Measure and record the nut (1) run-on torque.
(g) TORQUE the nut (1) to between 300 and 270 lbf.in (3.39 and 3.05 m.daN ) plus the run-on torque until the same torque indication holds.
(h) Remove the PWA211435 ADAPTER, TORQUE from the nut (1) and the main gearbox.
(3) Do a check for the correct installation of the PMA rotor (2).
(a) Make sure that there is no space between the PMA rotor (2) and slinger (3) with a MIRROR - INSPECTION.
(b) Make sure that a minimum of three shaft threads can be seen after the final torque of the nut (1).
(c) Check the dimension from the end of the main gearbox shaft to the front surface of the nut (1).
(e) If any of the checks above fail, examine the assembly for correct interface, remove the PMA rotor (2) and repeat Step 4.A.(2).
(4) Install the PMA stator (Ref. AMM TASK 73-21-04-400-801).
(5) Examine the assembly for unwanted objects, damage and correct assembly.
5. Close-up(1) Removal of protection covers
CAUTION:
REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.
(a) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine. (2) Install the PMA rotor (2) on the shaft as follows:
CAUTION:
THERE ARE STRONG MAGNETS IN THE ROTOR. MAKE SURE YOU KEEP THE ROTOR AWAY FROM OTHER METAL OBJECTS, PARTICLES AND DUST. IF YOU DO NOT DO THIS, DAMAGE TO THE ROTOR CAN OCCUR.
CAUTION:
WHEN YOU INSTALL THE ROTOR ONTO THE SHAFT, MAKE SURE THAT THE FLATS OF THE MAIN GEARBOX SHAFT ARE ALIGNED WITH THE FLATS OF THE PMA ROTOR. MISALIGNMENT OF THE FLATS WILL CAUSE INCORRECT INSTALLATION OF THE ROTOR AND POSSIBLE ENGINE DAMAGE.
(a) Install the slinger (3) to the shaft if necessary as follows: 1 Find the larger Inner Diameter (ID) of the slinger (3).
2 Install the slinger (3) to the shaft with the larger ID to face aft.
NOTE: The larger ID of the slinger must be positioned aft over the bearing journal shaft.
(b) Align the flats of the PMA rotor (2) to the flats on the shaft. NOTE: The flats of the PMA rotor must face forward.
(c) Install the PMA rotor (2) to the shaft so that it engages the shaft completely. (d) Ensure that the two flats in the inner diameter of the PMA rotor are aligned with the two flats on the shaft before you torque the nut.
(e) Install the PWA211435 ADAPTER, TORQUE to the nut (1) and the main gearbox with the three captive bolts.
(f) Measure and record the nut (1) run-on torque.
(g) TORQUE the nut (1) to between 300 and 270 lbf.in (3.39 and 3.05 m.daN )
plus the run-on torque until the same torque indication holds. (h) Remove the PWA211435 ADAPTER, TORQUE from the nut (1) and the main gearbox.
(3) Do a check for the correct installation of the PMA rotor (2).
(a) Make sure that there is no space between the PMA rotor (2) and slinger (3) with a MIRROR - INSPECTION.
(b) Make sure that a minimum of three shaft threads can be seen after the final torque of the nut (1).
(c) Check the dimension from the end of the main gearbox shaft to the front surface of the nut (1).
NOTE: The dimension should be approximately 0.200 in. (5.080 mm).
(d) While you hold the PMA rotor (2) with one hand, check the slinger (3) for movement by using hand pressure to turn the slinger (3) clockwise or counterclockwise. The slinger (3) should not turn. (e) If any of the checks above fail, examine the assembly for correct interface, remove the PMA rotor (2) and repeat Step 4.A.(2).
(4) Install the PMA stator (Ref. AMM TASK 73-21-04-400-801).
(5) Examine the assembly for unwanted objects, damage and correct assembly.
Subtask 73-21-05-410-050-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the left thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL
Subtask 73-21-05-440-050-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the left thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL
B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).
Subtask 73-21-05-410-051-A ** ON A/C NOT FOR ALL C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).
(3) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802)
Subtask 73-21-05-710-050-A ** ON A/C NOT FOR ALL (1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).
(3) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802)