Removal of the Anti Leak Valve [CFML]

TASK 79-21-05-000-805-A
Removal of the Anti Leak Valve

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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 400
FIN: 4013EM

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	1	SCREWDRIVER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-79-610-802-A	Draining of the Accessory Gearbox (AGB)
TASK 12-13-79-610-803-A	Draining of the Lubrication Unit
TASK 12-13-79-610-808-A	Draining of the Oil Tank
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
Anti Leak Valve

3. Job Set-up
Subtask 79-21-05-941-064-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 a 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 the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 79-21-05-010-061-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 79-21-05-020-057-A

A. Removal of the Anti leak Valve

WARNING: BEFORE YOU START THE PROCEDURE, PUT A WIDE DRIP PAN ON THE GROUND TO COLLECT THE OIL THAT CAN FLOW DURING THE OPERATION. OIL ON THE FLOOR CAN CAUSE YOU TO SLIP AND FALL.

(1) Drain the oil tank (Ref. AMM TASK 12-13-79-610-808).
(2) Drain the lubrication unit (Ref. AMM TASK 12-13-79-610-803).
(3) Drain the accessory gearbox (Ref. AMM TASK 12-13-79-610-802).

WARNING: USE PERSONAL PROTECTION EQUIPMENT. USE THE ENGINE OIL IN A WELL-VENTILATED AREA. ENGINE OIL IS TOXIC.

(4) Remove the four bolts (3) from the oil tube (1).
(5) Disconnect the oil tube (1) from the lubrication unit (2).
(6) Remove and discard the gasket (4) from the oil tube (1).
(7) Removal of the anti leak valve (6):
(a) Use a SCREWDRIVER to pull out the first end of the retaining ring (5).
(b) Twist the retaining ring (5) until it is released from the groove of the lubrication unit (2) and discard it.
(c) Remove the anti leak valve (6).
(d) Remove and discard the O-ring (7).
(8) Install the CAP - PROTECTION and COVER - PROTECTION on all the open ports, open tubes and open hoses.

[Rev.10 from 2021] 2026.04.01 03:42:59 UTC