Replacement of LPT Shaft Plug O-rings [CFMI]

TASK 72-55-00-960-001-A
Replacement of LPT Shaft Plug O-rings

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	SCRIBE
No specific	AR	WARNING NOTICE(S)
856A2632	1	PULLER
856A2668	1	KIT-PULLER ADAPTERS

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2442)	engine oil

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
50	O-RING	AIPC 72-55-00-01-020
60	O-RING	AIPC 72-55-00-01-020
40	O-RING	AIPC 72-55-00-01-030

D. Referenced Information

REFERENCE	DESIGNATION
TASK 72-21-00-000-001-A	Removal of the Spinner Front Cone
TASK 72-21-00-000-002-A	Removal of the Spinner Rear Cone
TASK 72-21-00-400-001-A	Installation of the Spinner Front Cone
TASK 72-21-00-400-002-A	Installation of the Spinner Rear Cone
Low Pressure Turbine Shaft Assembly

3. Job Set-up
Subtask 72-55-00-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU :
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 72-55-00-010-050-A ** ON A/C NOT FOR ALL

B. Preparation for the replacement of LPT shaft plug O-rings
(1) Remove the spinner front cone. (Ref. AMM TASK 72-21-00-000-001)
(2) Remove the spinner rear cone. (Ref. AMM TASK 72-21-00-000-002)

4. Procedure
Subtask 72-55-00-960-050-A ** ON A/C NOT FOR ALL

A. Replacement of LPT shaft plug O-rings

Low Pressure Turbine Shaft Assembly ** ON A/C NOT FOR ALL

(1) Remove retaining ring from forward end of LPT shaft, using a SCRIBE.
(2) Remove LPT shaft plug (10) using the 856A2668 KIT-PULLER ADAPTERS (856A2668G02) or 856A2632 PULLER (856A2632G01).
(3) Remove and discard O-rings located in forward/aft grooves and in machining undercut relief.
(4) Remove the puller adapter from the LPT shaft plug (10). Install the LPT shaft plug (10) in the storage box.

CAUTION: MAKE SURE THAT YOU CORRECTLY INSTALL A NEW O-RING IN THE SEAL GROOVE AT THE FORWARD END OF THE LPT SHAFT PLUG. IF THE O-RING IS NOT CORRECTLY INSTALLED, DAMAGE TO THE ENGINE CAN OCCUR.

(5) Lightly coat new AIPC 72-55-00-01-020 O-RING (50) AIPC 72-55-00-01-020 O-RING (60) with engine oil (Material No.CP2442) and install into forward groove and machined undercut relief of LPT shaft plug forward end.
(6) Lightly coat new AIPC 72-55-00-01-030 O-RING (40) with engine oil (Material No.CP2442) and install into aft groove of LPT shaft plug.
(7) Install LPT shaft plug assembly into forward end of LPT shaft and onto center vent tube.

NOTE: Insert lug of LPT shaft in aligned slots of LPT coupling nut and LPT shaft.

(8) Install retaining ring onto LPT shaft.

5. Close-up
Subtask 72-55-00-410-050-A ** ON A/C NOT FOR ALL

A. Install the Spinner Rear and Front Cone.
(1) Install the spinner rear cone. (Ref. AMM TASK 72-21-00-400-002)
(2) Install the spinner front cone. (Ref. AMM TASK 72-21-00-400-001)

[Rev.10 from 2021] 2026.04.01 02:39:52 UTC