Removal of the Oil Inlet Cover Assembly [CFMB]

TASK 72-56-00-000-002-A
Removal of the Oil Inlet Cover Assembly

CAUTION: MAKE SURE THAT:

THE AIRCRAFT IS IN A SEALED HANGAR WHEN YOU REMOVE THE OIL-INLET COVER
A PLASTIC SHEET GIVES PROTECTION TO THE ENGINE AFT SUMP DURING ALL THE PROCEDURE.

IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN CAUSE DAMAGE TO THE ENGINE.

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

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	WARNING NOTICE(S)
856A3419G02	1	ADAPTER, PULLER - OIL INLET COVER

B. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-79-610-002-A	Check oil level and replenish Check Pop Out Indicator of EMCD (Electrical Master Chip Detector)
TASK 12-13-79-610-002-A-01	Check oil level and replenish (Pressure Filling)
TASK 72-56-00-000-001-A	Removal of the Flame Arrestor and Flange Assembly
TASK 79-00-00-281-003-A	Check of FWD Sump, AFT Sump, AGB and TGB Scavenge Screens
Oil Inlet Cover
Aft Sump Oil Supply Tubes

3. Job Set-up
Subtask 72-56-00-941-053-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) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five 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) in position to tell persons not to energize the FADEC 1(2).

Subtask 72-56-00-010-056-A ** ON A/C NOT FOR ALL

B. Remove the flame arrestor and the flange assembly (Ref. AMM TASK 72-56-00-000-001).

4. Procedure
Subtask 72-56-00-020-052-C ** ON A/C NOT FOR ALL

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:

ONE WRENCH TO HOLD THE UNION, AND
ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.

THIS PREVENTS DAMAGE TO THE PARTS.

A. Removal of the Rear Sump Oil-Supply Tubes

NOTE: This procedure is for turbine frame with tangential symmetrical section struts only.

(1) Cut and remove all the lockwires that safety the tube coupling nuts.
(2) Loosen the coupling nuts of the oil supply tube (170) from the nipple (180), on the oil inlet cover (160) and from the oil supply tube (220), in the Low Pressure Turbine (LPT) frame strut.
(3) Loosen the two coupling nuts of the damping oil tube (200) from the nipple (210) on the No. 5 bearing support and from the oil supply tube (170).
(4) Remove the damping oil tube (200) and the oil supply tube (170).

Subtask 72-56-00-020-053-B ** ON A/C NOT FOR ALL

B. Removal of the Oil Inlet Cover

NOTE: This procedure is for turbine frame with tangential symmetrical section struts only.

(1) Remove the bolts (30) that attach the oil inlet cover (160) to the No. 5 bearing support.
(2) Install the 856A3419G02 ADAPTER, PULLER - OIL INLET COVER on the rear flange of the oil inlet cover (160).
(3) Remove the oil inlet cover (160).
(4) Remove and discard the O-ring (20).
(5) Remove and discard the gasket seal (230).
(6) Remove the 856A3419G02 ADAPTER, PULLER - OIL INLET COVER from the oil inlet cover (160).
(7) Remove the lockwire.

(a) Cut and remove the lockwire that safeties the nipple (180) to the oil inlet cover (160).
(8) Remove the nipple (180) from the oil inlet cover (160).
(9) Remove and discard the O-ring (190).

Subtask 72-56-00-210-055-A ** ON A/C NOT FOR ALL

C. Inspection of the Oil Inlet Cover
(1) Do a check for rub marks from seal teeth in the abradable coating of the oil inlet cover.
(a) If you find marks with an average of less than 0.010 in. (0.2540 mm) (0.2539 mm) deep over entire circumference, the oil inlet cover is serviceable.
(b) If you find marks with an average of more than 0.010 in. (0.2540 mm) deep over entire circumference, send the oil inlet cover to the shop for repair.

Subtask 72-56-00-210-059-A ** ON A/C NOT FOR ALL

D. Inspection of the Flame Arrestor
(1) If you find particles on the flame arrestor:

NOTE: Silver filaments are possible during engine break-in, caused by the initial penetration of the rear Center Vent Tube (CVT) seal teeth into the silver abradable sleeve located on the oil inlet cover.

(a) Remove all particles from the flame arrestor.
(b) Examine the AFT sump scavenge screen (Ref. AMM TASK 79-00-00-281-003).
(c) Make sure that the oil consumption is in the limits (Ref. AMM TASK 12-13-79-610-002).

[Rev.10 from 2021] 2026.04.01 02:43:22 UTC