Replacement of LPT Shaft Plug O-rings [CFMB]

TASK 72-55-00-960-002-A
Replacement of LPT Shaft Plug O-rings

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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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
856A2946	1	RING-PROTECTIVE FAN DISK
856A3793	1	FIXTURE,PUSHER PULLER-CVT

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1039)	acetone
(Material No.CP2104)	molykote G rapid
(Material No.CP2442)	engine oil
(Material No.CP5062)	MoS_2 dry film lubricant
(Material No.CP5070)	vaseline

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
20	RETAINING RING	AIPC 72-55-00-01-010
70	RETAINING RING	AIPC 72-55-00-01-010
100	O-RING	AIPC 72-55-00-01-020
50	O-RING	AIPC 72-55-00-01-020
40	O-RING	AIPC 72-55-00-01-030
90	O-RING	AIPC 72-55-00-01-030
80	DAMPER SEALS	AIPC 72-55-00-01-060

D. Referenced Information

REFERENCE	DESIGNATION
TASK 72-21-00-000-005-A	Removal of the Spinner Front Cone
TASK 72-21-00-000-006-A	Removal of the Spinner Rear Cone
TASK 72-21-00-400-005-A	Installation of the Spinner Front Cone
TASK 72-21-00-400-006-A	Installation of the Spinner Rear Cone
Low Pressure Turbine Shaft Assembly (PRE CFM SB72-0436)
Center Vent Tube Forward Removable (POST CFM SB72-0436 and PRE CFM SB72-1015)
Low Pressure Turbine Shaft Assembly (POST CFM SB72-1015)

3. Job Set-up
Subtask 72-55-00-941-051-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 72-55-00-010-051-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 72-21-00-000-005)
(2) Remove the spinner rear cone. (Ref. AMM TASK 72-21-00-000-006)

4. Procedure
Subtask 72-55-00-960-051-A ** ON A/C NOT FOR ALL

A. Replacement of LPT shaft plug O-rings

PRE CFM SB72-0436

(1) Replacement of LPT shaft plug O-rings

Low Pressure Turbine Shaft Assembly (PRE CFM SB72-0436) ** ON A/C NOT FOR ALL

(a) Remove the retaining ring from forward end of LPT shaft, using a SCRIBE.
(b) Remove LPT shaft plug (10) using the 856A2668 KIT-PULLER ADAPTERS (856A2668G02) or 856A2632 PULLER (856A2632G01).
(c) Remove and discard O-rings located in forward/aft grooves.
(d) Remove the 856A2668 KIT-PULLER ADAPTERS (856A2668G02) or the 856A2632 PULLER (856A2632G01) from the LPT shaft plug (10). Install the LPT shaft plug (10) in the storage box.

CAUTION: ACETONE IS EXPLOSIVE, AN IRRITANT, AN ALLERGEN, AND HAS POISONOUS DETERIORATION. USE PERSONAL PROTECTION EQUIPMENT. USE VAPOR/FUME CONTROL OR A RESPIRATOR.

(e) Clean the oil stains on the plug grooves with acetone (Material No.CP1039) .
(f) Clean the oil stains on the inner diameter of LPT forward shaft with bent brush soaked with acetone (Material No.CP1039) .

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.

(g) Lightly coat new AIPC 72-55-00-01-030 O-RING (40) and new AIPC 72-55-00-01-020 O-RING (50) with engine oil (Material No.CP2442) and install into the seal grooves of LPT shaft plug.
(h) 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.

(i) Install AIPC 72-55-00-01-010 RETAINING RING (20) onto LPT shaft.
1 Do a visual inspection to make sure of the correct installation of retaining ring (20)

END OF PRE CFM SB72-0436

POST CFM SB72-0436 and PRE CFM SB72-1015

(2) Replacement of the O-rings and Damper Seals on the center vent tube forward removable

Center Vent Tube Forward Removable (POST CFM SB72-0436 and PRE CFM SB72-1015) ** ON A/C NOT FOR ALL

WARNING: USE THERMAL GLOVES WHEN YOU MOVE OR TOUCH HOT OR COLD PARTS. HOT OR COLD PARTS CAN CAUSE INJURY.

WARNING: USE PERSONAL PROTECTION EQUIPMENT. USE THE ENGINE OIL IN A WELL-VENTILATED AREA. ENGINE OIL IS TOXIC.

CAUTION: DO THE REPLACEMENT OF THE O'RING AND DAMPER SEALS IN AN ENGINE WARM CONDITION, WITHIN 2 HOURS AFTER ENGINE SHUT DOWN, FOR EASY REMOVAL.

(a) Install the 856A2946 RING-PROTECTIVE FAN DISK (856A2946G01) as follows:
1 Install the lower sector of the 856A2946 RING-PROTECTIVE FAN DISK (856A2946G01) in position in the fan disk hole.
2 Attach the lower sector of the 856A2946 RING-PROTECTIVE FAN DISK (856A2946G01) with the knurled screws.
3 Install the upper sector of the 856A2946 RING-PROTECTIVE FAN DISK (856A2946G01) in position in the fan disk hole.
4 Attach the upper sector of the 856A2946 RING-PROTECTIVE FAN DISK (856A2946G01) with the knurled screws.
(b) Remove the retaining ring from the front of the LPT shaft.
(c) Screw the tube of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) in the center vent tube (60).
(d) Install the support of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) on the fan disk flange with four screws.
(e) Engage the plate of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) in the slot of the screw and attach it with the knurled nut.
(f) Manually turn clockwise the screw of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) to disengage the center vent tube (60) from the LPT Shaft.

NOTE: You can use a wrench if the counter torque is important.

(g) Remove the support of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) from the fan disk flange.
(h) Remove the center vent tube (60) equipped with the tube of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) from the LPT Shaft.
(i) Remove the tube of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) from the center vent tube.
(j) Remove and discard O-rings located in forward/aft grooves of the center vent tube.
(k) Remove and discard the damper seals located in the other grooves of the center vent tube.
(l) Clean the oil stains with acetone (Material No.CP1039) on the center vent tube (60), in the O-rings (90) and (100) and damper seals (80) grooves and in the inner diameter of the fan disk with a lint-free cloth.
(m) Clean the oil stains on the inner diameter of LPT forward shaft with bent brush soaked with acetone (Material No.CP1039) .
(n) Install the center vent tube (60) in the storage box.

CAUTION: MAKE SURE THAT YOU CORRECTLY INSTALL THREE NEW DAMPER SEALS IN THE THREE SEAL GROOVES OF THE CENTER VENT TUBE. YOU MUST HAVE THE PLATE FACE OF THE DAMPER SEALS POINTED TO OUTER OF THE CENTER VENT TUBE. IF THE DAMPER SEALS ARE NOT CORRECTLY INSTALLED, DAMAGE TO THE ENGINE CAN OCCUR.

(o) Lubricate the mating face of the rear vent tube with MoS_2 dry film lubricant (Material No.CP5062) or with molykote G rapid (Material No.CP2104) .
(p) Lightly coat three new AIPC 72-55-00-01-060 DAMPER SEALS (80) with engine oil (Material No.CP2442) and install them into their seal grooves of the center vent tube (60).

CAUTION: MAKE SURE THAT YOU CORRECTLY INSTALL TWO NEW O-RINGS IN THE SEAL GROOVE AT THE FORWARD END OF THE CENTER VENT TUBE. IF THE O-RINGS ARE NOT CORRECTLY INSTALLED, DAMAGE TO THE ENGINE CAN OCCUR.

(q) Lightly coat new AIPC 72-55-00-01-030 O-RING (90) and new AIPC 72-55-00-01-020 O-RING (100) with engine oil (Material No.CP2442) and install into the seal grooves of the center vent tube (60).
(r) Prepare the center vent tube (60) for installation as follows:
1 Screw the tube of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) in the center vent tube (60).

CAUTION: TAKE CARE NOT TO DAMAGE THE LPT SHAFT INTERNAL SUPPORTS AND PAINT DURING THE INSTALLATION OF THE CENTER VENT TUBE.

2 Align and install the center vent tube (60) into the LPT Shaft.
3 Align the lug of the center vent tube (60) with the aligned slots of the LPT Shaft and the LPT coupling.
(s) Install the 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) as follows:
1 Install the support of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) on the fan disk flange with four screws.
2 Engage the plate of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) in the slot of the screw and attach it with the knurled nut.
(t) Complete the installation of the center vent tube (60) as follows:

CAUTION: TAKE CARE TO STOP TURN COUNTER-CLOCKWISE THE SCREW OF FIXTURE OF PUSHER/PULLER BEFORE THE LUG OF THE CENTER VENT TUBE TOUCHES THE SLOT OF THE LPT SHAFT.

1 Manually turn counter-clockwise the screw of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) to engage the center vent tube (60) into the slot of the LPT Shaft.

NOTE: You can use a wrench if the counter torque is important.

2 Remove the support of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) from the fan disk flange.
3 Remove the tube of fixture of 856A3793 FIXTURE,PUSHER PULLER-CVT (856A3793G02) from the center vent tube (60).
(u) Install the AIPC 72-55-00-01-010 RETAINING RING (70) onto the LPT shaft.
(v) Remove the 856A2946 RING-PROTECTIVE FAN DISK (856A2946G01) as follows:
1 Unscrew the knurled screws of the 856A2946 RING-PROTECTIVE FAN DISK (856A2946G01) which attach the upper sector.
2 Remove the upper sector of the 856A2946 RING-PROTECTIVE FAN DISK (856A2946G01) from the fan disk hole.
3 Unscrew the knurled screws of the 856A2946 RING-PROTECTIVE FAN DISK (856A2946G01) which attach the lower sector.
4 Remove the lower sector of the 856A2946 RING-PROTECTIVE FAN DISK (856A2946G01) from the fan disk hole.
(w) Do a visual inspection to make sure of the correct installation of retaining ring (70).

END OF POST CFM SB72-0436 and PRE CFM SB72-1015

POST CFM SB72-1015

(3) Replacement of LPT shaft plug O-rings

Low Pressure Turbine Shaft Assembly (POST CFM SB72-1015) ** ON A/C NOT FOR ALL

(a) Remove the retaining ring from forward end of LPT shaft, using a SCRIBE.
(b) Install the 856A2946 RING-PROTECTIVE FAN DISK as follows:
1 Install the lower sector of the 856A2946 RING-PROTECTIVE FAN DISK in position in the fan disk hole.
2 Attach the lower sector of the 856A2946 RING-PROTECTIVE FAN DISK with the knurled screws.
3 Install the upper sector of the 856A2946 RING-PROTECTIVE FAN DISK in position in the fan disk hole.
4 Attach the upper sector of the 856A2946 RING-PROTECTIVE FAN DISK with the knurled screws.
(c) Remove LPT shaft plug (110) using the 856A3793 FIXTURE,PUSHER PULLER-CVT.
(d) Remove and discard O-rings located in forward/aft grooves.
(e) Remove the 856A3793 FIXTURE,PUSHER PULLER-CVT from the LPT shaft plug (110). Install the LPT shaft plug (110) in the storage box.
(f) Cleaning of the oil stains on the plug grooves

CAUTION: ACETONE IS EXPLOSIVE, AN IRRITANT, AN ALLERGEN, AND HAS POISONOUS DETERIORATION. USE PERSONAL PROTECTION EQUIPMENT. USE VAPOR/FUME CONTROL OR A RESPIRATOR.

1 Clean the oil stains on the plug grooves with acetone (Material No.CP1039) .
(g) Clean the oil stains on the inner diameter of LPT forward shaft with bent brush soaked with acetone (Material No.CP1039) .
(h) Installation of new O-ring

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.

1 Lightly coat new AIPC 72-55-00-01-030 PACKING (40) and new AIPC 72-55-00-01-020 PACKING (50) with vaseline (Material No.CP5070) and install into the seal grooves of LPT shaft plug.
(i) 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.

(j) Install AIPC 72-55-00-01-010 RING (20) onto LPT shaft.
(k) Remove the 856A2946 RING-PROTECTIVE FAN DISK as follows:
1 Loosen the knurled screws of the 856A2946 RING-PROTECTIVE FAN DISK which attach the upper sector.
2 Remove the upper sector of the 856A2946 RING-PROTECTIVE FAN DISK from the fan disk hole.
3 Loosen the knurled screws of the 856A2946 RING-PROTECTIVE FAN DISK which attach the lower sector.
4 Remove the lower sector of the 856A2946 RING-PROTECTIVE FAN DISK from the fan disk hole.
(l) Do a visual inspection to make sure of the correct installation of AIPC 72-55-00-01-010 RING (20).

END OF POST CFM SB72-1015

5. Close-up
Subtask 72-55-00-410-051-A ** ON A/C NOT FOR ALL

A. Install the Spinner Rear and Front Cone.
(1) Install the spinner rear cone. (Ref. AMM TASK 72-21-00-400-006)
(2) Install the spinner front cone. (Ref. AMM TASK 72-21-00-400-005)

[Rev.10 from 2021] 2026.04.01 02:43:17 UTC