Removal of the Air/Oil Separator Assembly [CFMB]

TASK 72-56-00-000-802-A
Removal of the Air/Oil Separator Assembly

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.

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	ACCESS PLATFORM 1M(3 FT)
No specific	1	HAMMER - SLIDE
No specific	1	TORQUE MULTIPLIER
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - RATCHET
856A2661	1	AFT ROTATING AIR/OIL SEPARATOR PULLER
856A3392	1	AFT ROTATING AIR/OIL SEPARATOR WRENCH TORQUE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 72-56-00-000-001-A	Removal of the Flame Arrestor and Flange Assembly
TASK 72-56-00-000-002-A	Removal of the Oil Inlet Cover Assembly
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
Removal/Installation of the Air/Oil Separator Nut
Removal of the Air/Oil Separator

3. Job Set-up
Subtask 72-56-00-860-057-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine shutdown occurred five minutes or more before you do this procedure.
(3) On 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) in position to tell persons not to energize the FADEC 1(2).

Subtask 72-56-00-010-074-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position

Subtask 72-56-00-040-053-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 72-56-00-010-075-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 72-56-00-010-072-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Remove the flame arrestor and the flange assembly (Ref. AMM TASK 72-56-00-000-001).
(2) Remove the oil inlet cover assembly (Ref. AMM TASK 72-56-00-000-002).

4. Procedure
Subtask 72-56-00-020-066-A ** ON A/C NOT FOR ALL

A. Removal of the Air/Oil Separator Nut

Removal/Installation of the Air/Oil Separator Nut ** ON A/C NOT FOR ALL

(1) Remove the air/oil separator nut (20) with the 856A3392 AFT ROTATING AIR/OIL SEPARATOR WRENCH TORQUE.

CAUTION: MAKE SURE THAT YOU ENGAGE THE SOCKET LUGS OF THE WRENCH AND THE COUNTERTORQUE WRENCH IN THE RELATED SLOTS OF THE AIR/OIL SEPARATOR NUT AND REAR VENT TUBE CORRECTLY. IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE DAMAGE TO PARTS.

(a) Engage the guide (30) in the rear vent tube (40) and at the same time engage the wrench (50) and the counter torque wrench (60) into the slots of the air/oil separator nut (20) and slots of the rear vent tube (40).
(b) Install the TORQUE MULTIPLIER (70) in the counter torque wrench (60) and the lever arm (80) of the TORQUE MULTIPLIER (70) in the fork arm (90) of the wrench (50).
(c) Install the WRENCH - RATCHET on the TORQUE MULTIPLIER (70) and remove the air/oil separator nut (20).
(d) Remove the 856A3392 AFT ROTATING AIR/OIL SEPARATOR WRENCH TORQUE and the TORQUE MULTIPLIER (70).

Subtask 72-56-00-020-067-A ** ON A/C NOT FOR ALL

B. Removal of the Air/Oil Separator Assembly

Removal of the Air/Oil Separator ** ON A/C NOT FOR ALL

(1) Remove the air/oil separator (10) with the 856A2661 AFT ROTATING AIR/OIL SEPARATOR PULLER.
(a) Install the protector (150), on the seal teeth of the rear vent tube (40).
(b) Loosen the knurled knobs (170) to retract the finger grips (160).
(c) Put the tool in position on the rear vent tube (40), against the air/oil separator (10).
(d) Tighten the knurled knobs (170) to engage the finger grips (160) into the rear flange of the air/oil separator (10).
(e) Install the HAMMER - SLIDE (180) on the 856A2661 AFT ROTATING AIR/OIL SEPARATOR PULLER.
(f) Remove the air/oil separator (10).
(g) Loosen the knurled knobs (170) and remove the air/oil separator (10) from the 856A2661 AFT ROTATING AIR/OIL SEPARATOR PULLER.

[Rev.10 from 2021] 2026.04.01 02:43:24 UTC