Removal of the Oil Filter Differential Pressure Switch [CFMI]

TASK 79-35-15-000-040-A
Removal of the Oil Filter Differential Pressure Switch

FIN: 4001EN ** 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	CONTAINER 1 L (1/4 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	PLIERS - CONNECTOR, JAW, SOFT
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-A	Opening of the Fan Cowl Doors
Oil Filter Differential Pressure Switch

3. Job Set-up
Subtask 79-35-15-941-051-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 79-35-15-010-052-A ** ON A/C NOT FOR ALL

B. Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure
Subtask 79-35-15-020-051-B ** ON A/C NOT FOR ALL

A. Removal of the Oil Filter Differential Pressure Switch.
POST SB RA32079-8
(1) Cut the lockwire and remove the insulation housing (40) from the switch (10).
(2) Cut the lockwire and remove the boots (45) and (50) from the fittings on the hoses.
(3) Disconnect the electrical connector 4001ENA (5) from the oil filter differential pressure switch (10). Use PLIERS - CONNECTOR, JAW, SOFT only if necessary. Install a COVER - PROTECTION on connector.
(4) Put CONTAINER 1 L (1/4 USGAL) below the switch, disconnect the hoses and let the oil drain.
(5) Remove the reducer (15), the union (20), and the packings (25) from the switch (10). Discard the packings.
(6) Remove the bolts (30) and the washers (35). Remove the switch (10), thermo barrier (60) and bracket (55) from the mounting bracket.
(7) Install COVER - PROTECTION on the switch, the hose couplings and, the fittings.
END OF POST SB RA32079-8

[Rev.10 from 2021] 2026.04.01 03:38:43 UTC