Removal of the Engine Oil Low Pressure Switch [CFML]

TASK 79-34-15-000-802-A
Removal of the Engine Oil Low Pressure Switch

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.

FIN: 5000KS

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	CAP - PROTECTION
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-70-00-910-804-A	Electrical Standard Practices
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
Engine Oil Low Pressure Switch

3. Job Set-up
Subtask 79-34-15-941-055-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 79-34-15-010-057-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

4. Procedure
Subtask 79-34-15-020-054-A

A. Removal of the Engine Oil Low Pressure Switch (oil LP switch)
(1) Remove the harness of the electrical connector (6) from the support bracket (1).
(2) Disconnect the electrical connector (6) from the receptacle on the oil LP switch (5) (Ref. AMM TASK 70-70-00-910-804).
(3) Disconnect the coupling nut of the tube (3) from the oil LP switch (5).
(4) Remove the four bolts (4) that attach the oil LP switch (5) to the mount bracket (2).
(5) Remove the oil LP switch (5) from the engine.
(6) Install the COVER - PROTECTION and the CAP - PROTECTION on all the open ports, open tubes, open hoses and the disconnected connectors.

[Rev.10 from 2021] 2026.04.01 03:43:33 UTC