Deactivation of the Thrust Reverser System Non-Return Valve [IAE]

TASK 78-31-00-040-040-A
Deactivation of the Thrust Reverser System Non-Return Valve

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

1. Reason for the Job

NOTE: This deactivation task is not related to an AFM-CDL/MMEL item

This procedure supplies the data to deactivate (by pass) the thrust reverser system non-return valve for maintenance of the thrust reverser system.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
413AL
FOR [1000EM2] (ENGINE-2)
423AL

C. Referenced Information

REFERENCE	DESIGNATION
Thrust Reverser System Non-Return Valve

3. Job Set-up
Subtask 78-31-00-941-051-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).
(4) Put the ACCESS PLATFORM 2M (6 FT) in position.

Subtask 78-31-00-010-055-A ** ON A/C NOT FOR ALL

B. Remove the pylon access panels
(1) FOR [1000EM1] (ENGINE-1)
413AL.
(2) FOR [1000EM2] (ENGINE-2)
423AL.

4. Procedure
Subtask 78-31-00-040-051-A ** ON A/C NOT FOR ALL

A. Put the thrust reverser system non-return valve in the bypass position.

Thrust Reverser System Non-Return Valve ** ON A/C NOT FOR ALL

(1) Remove the lockwire from the lever (2) of the valve (1).
(2) Put the lever (2) in line with the longitudinal axis of the valve.

[Rev.10 from 2021] 2026.04.01 03:27:26 UTC