Removal of the Thrust Reverser Pressure Relief Door (452DR, 462DR) [IAE]

TASK 78-32-80-000-010-A
Removal of the Thrust Reverser Pressure Relief Door (452DR, 462DR)

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	1	BAR LENGTH 60 CM (2 FT) BREAKER
No specific	AR	WARNING NOTICE(S)
IAE1N20023	1	ADAPTER-TORQUE TOOL

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 452DR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 462DR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
Pressure Relief Door (Pre SB 78-0195)
Pressure Relief Door (Post SB 78-0195)

3. Job Set-up
Subtask 78-32-80-941-050-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 78-32-80-010-050-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-80-040-050-A ** ON A/C NOT FOR ALL

C. Deactivate the thrust reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 78-32-80-010-051-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser pressure relief door.

Pressure Relief Door (Pre SB 78-0195) ** ON A/C NOT FOR ALL

(1) FOR [1000EM1] (ENGINE-1)
452DR
(2) FOR [1000EM2] (ENGINE-2)
462DR
(3) Install the IAE1N20023 ADAPTER-TORQUE TOOL on a BAR LENGTH 60 CM (2 FT) BREAKER.
(4) Put the IAE1N20023 ADAPTER-TORQUE TOOL into the latch bolt slot (10), (2 places) of the pressure relief door (9).

NOTE: The IAE1N20023 ADAPTER-TORQUE TOOL must rest evenly in the latch bolt slot (10).

(5) Apply a force to the wrench until the latch bolt releases and open the pressure relief door.

4. Procedure
Subtask 78-32-80-020-050-A ** ON A/C NOT FOR ALL

A. Remove the thrust reverser pressure relief door 452DR (462DR)

Pre SB 78-0195

Pressure Relief Door (Pre SB 78-0195) ** ON A/C NOT FOR ALL

(1) Remove the nut (5), the washers (3), the bolts (2) and the lanyard assembly (4), from the pressure relief door (9) and the right thrust reverser half (1).
(2) Remove the cotter pins (8), the washers (7) and the pins (6) which attach the pressure relief door to the right thrust reverser half (1).
(3) Remove the pressure relief door (9).
(4) Discard the cotter pins (8).

Post SB 78-0195

Pressure Relief Door (Post SB 78-0195) ** ON A/C NOT FOR ALL

(5) Remove the cotter pins (8), the washers (7) and the pins (6) which attach the pressure relief door to the right thrust reverser half (1).
(6) Remove the pressure relief door (9).
(7) Discard the cotter pins (8).

[Rev.10 from 2021] 2026.04.01 13:12:20 UTC