Removal of the Back-up Oil Filter [CFMB]

TASK 79-21-10-000-006-A
Removal of the Back-up Oil Filter

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	ACCESS PLATFORM 1M(3 FT)
No specific	AR	CONTAINER 1 L (1/4 USGAL)
No specific	AR	HAMMER - SLIDE, PULLER, STANDARD
No specific	AR	LOCALLY MANUFACTURED - ADAPTER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
CMM 792115
Removal/Installation of the Back-up Filter

3. Job Set-up
Subtask 79-21-10-941-057-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 79-21-10-010-060-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 an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 79-21-10-020-060-A ** ON A/C NOT FOR ALL

A. Removal of the Back-up Oil Filter

WARNING: USE PROTECTIVE GLOVES AND BE CAREFUL WITH OIL SPLASHES WHEN YOU DISCONNECT OIL TUBES. HOT OIL CAN CAUSE DEEP BURNS.

CAUTION: UNLIKE THE O-RINGS, THE BACK-UP SEALS ON THE SUPPLY FILTER COVER AND DRAIN PLUG ARE NOT EXPENDABLE ITEMS. DO NOT REMOVE THEM IF A VISUAL INSPECTION SHOWS THEY ARE SERVICEABLE. REMOVE THEM ONLY IF DAMAGED BY TEARS, CUTS AND/OR DISTORTION.

CAUTION: THE BACK-UP OIL FILTER ASSY IS A CLEANABLE FILTER. AFTER CLEANING IT CAN BE USED AGAIN DURING A SUBSEQUENT REPLACEMENT OF THE SAME FILTER. THUS BE CAREFUL NOT TO DAMAGE THE BACK-UP FILTER AGAINST THE HOUSING, WHEN YOU REMOVE IT FROM THE LUBRICATION UNIT.

(1) Put a CONTAINER 1 L (1/4 USGAL) under the back-up filter to collect the remaining oil, if any.
(2) Remove the 4 bolts (40) which attach the back-up filter assembly (30) to the lubrication unit housing.
(3) Remove the back-up filter assembly (30) from the lubrication unit with a LOCALLY MANUFACTURED - ADAPTER attached to a HAMMER - SLIDE, PULLER, STANDARD. But, if available, it is better to use the removal tool specified in the Component Maintenance Manual of the lubrication unit: CMM 792115 with the standard slide hammer puller.
(4) Remove and discard the two O-rings (10) and (50).
(5) Do a visual inspection of the filter back-up seal (20). Do not remove if serviceable.
(6) Only if damaged, cut the back-up seal (20) with a sharp blade. Remove and discard.
(7) Send the removed back-up filter assembly (30) to the cleaning shop. For cleaning of the filter, refer to CMM 792115.

[Rev.10 from 2021] 2026.04.01 13:14:11 UTC