Removal of the Permanent Magnet Alternator (PMA) Rotor [CFML]

TASK 73-21-40-000-803-A
Removal of the Permanent Magnet Alternator (PMA) Rotor

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

ZONE: 400
FIN: 3041KS

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - PROTECTION
No specific	AR	COVER - PROTECTION
No specific	1	DRIVE 3/4 IN - HEXAGONAL
No specific	AR	WARNING NOTICE(S)
956A7613	1	ADAPTER, LOCK - CORE ENGINE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 72-63-03-000-801-A	Removal of the Manual-Control Cover of the Accessory Gearbox (AGB)
TASK 73-21-40-000-802-A	Removal of the Permanent Magnet Alternator (PMA) Stator
Permanent Magnet Alternator Rotor
Accessory Gearbox (AGB) Hand-Cranking Driver Distress

3. Job Set-up
Subtask 73-21-40-941-057-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 73-21-40-010-059-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

4. Procedure
Subtask 73-21-40-020-053-A

A. Removal of the PMA Rotor
(1) Remove the PMA stator (2) (Ref. AMM TASK 73-21-40-000-802).
(2) Do a check of the hand-cranking driver to make sure that the gear shaft tangs are correctly aligned with their socket slots. If a misalignment is observed, please contact CFM.

Accessory Gearbox (AGB) Hand-Cranking Driver Distress

(3) Remove the manual control cover (5) of the Accessory Gearbox (AGB) (Ref. AMM TASK 72-63-03-000-801).
(4) Install the 956A7613 ADAPTER, LOCK - CORE ENGINE or DRIVE 3/4 IN - HEXAGONAL in the AGB manual-control-cover drive-pad (6) to prevent turning of the AGB gearshaft (4).
(a) Attach the 956A7613 ADAPTER, LOCK - CORE ENGINE to the AGB manual-control-cover drive-pad (6) with its bolts.

CAUTION: DO NOT APPLY TOO MUCH TORQUE TO THE PERMANENT MAGNET ALTERNATOR (PMA) ROTOR NUT. THE ROTOR NUT HAS A LEFT THREAD. IF YOU APPLY TOO MUCH TORQUE, DAMAGE TO THE ROTOR NUT CAN OCCUR.

CAUTION: TO REMOVE THE LOCKNUT: - USE A TORQUE WRENCH WITH A 6-POINT SOCKET, AND - MAKE SURE THAT YOU APPLY A CONTINUOUS FORWARD PRESSURE ON THE SOCKET. IF YOU DO NOT OBEY THESE INSTRUCTIONS, DAMAGE TO THE NUT AND THE ADJACENT COMPONENTS CAN OCCUR.

(5) Remove the nut (3) that attaches the PMA rotor (1) to the AGB gearshaft.
(6) Remove the PMA rotor (1) from the AGB gearshaft (4).
(7) Install the COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses and the disconnected connectors.

[Rev.10 from 2021] 2026.04.01 03:04:48 UTC