Test the Release Load Setting of the Thrust Reverser Pressure Relief Door Latches [IAE]

TASK 78-32-80-700-010-A
Test the Release Load Setting of the Thrust Reverser Pressure Relief Door Latches

ZONE: 400
FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Refer to the MPD TASK: 783201-I9
FUNCTIONAL CHECK OF PRESSURE RELIEF DOOR LATCH TENSION.
This task supplies the data to test the release load setting of the thrust reverser pressure relief door latches.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 79 and 74 lbf.in (0.89 and 0.84 m.daN )
IAE1N20023	1	ADAPTER-TORQUE TOOL

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-23-11-911-012-A	The Procedure to Use Torque Wrenches and Power Tools
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing 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
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-31-00-710-041-A	Operational Test of the Thrust Reverser System with the CFDS
TASK 78-31-00-710-041-A-02	Operational test of the Thrust Reverser without the CFDS and Engine Running
TASK 78-32-80-000-010-A	Removal of the Thrust Reverser Pressure Relief Door (452DR, 462DR)
TASK 78-32-80-400-010-A	Installation of the Thrust Reverser Pressure Relief Door (452DR, 462DR)
Pressure Relief Door Latch Test

3. Job Set-up
Subtask 78-32-80-941-051-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 78-32-80-010-053-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 78-32-80-040-052-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust:

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)

4. Procedure
Subtask 78-32-80-720-050-A ** ON A/C NOT FOR ALL

A. Test the release load setting of the latch
(1) The correct latch release loads are between 157 lbf (69.84 daN) and 167 lbf (74.29 daN). Calculate the torque values necessary to release the latch with the torque wrench and IAE1N20023 ADAPTER-TORQUE TOOL, from the latch release loads, with the following formula:

(L)

0.53P -------

L + 1.5

where: P = latch release load

L = torque wrench length

Example:

Latch release load = 157 to 167 lbf

Torque wrench length = 12 in.

(12)

0.53 x 157 -------

12+1.5

(12)

0.53 x 167 -------

12+1.5

83.21 x 0.8888889 = 73.964445 which can be read as 74 lbf.in (0.84 m.daN).
88.51 x 0.8888889 = 78.675556 which can be read as 79 lbf.in (0.89 m.daN).
Thus, when you use a 12 in. (304,8 mm) torque wrench, the torque value indication on the torque wrench when the latch releases must be between to between 79 and 74 lbf.in (0.89 and 0.84 m.daN )

NOTE: This example is for a 12 in. (304.8 mm) long torque wrench. Use the formula shown above to calculate the range of torque values necessary to release the latch when you use a torque wrench that is other than 12 in. (304.8 mm) long.

(2) Make sure that the latch and the contact surfaces are clean.
(3) Close and latch the thrust reverser pressure relief door.
(4) Install the IAE1N20023 ADAPTER-TORQUE TOOL, on the torque wrench.
(5) Put the IAE1N20023 ADAPTER-TORQUE TOOL, in to the slot of the latch bolt. The torque adapter must rest evenly on the latch bolt

Pressure Relief Door Latch Test ** ON A/C NOT FOR ALL

(6) Apply a force to the torque wrench until the latch releases. Make sure that you apply the force at 90 degrees to the torque wrench handle (Ref. AMM TASK 70-23-11-911-012)
(7) Check that the torque value indication on the torque wrench is in the range of the torque values calculated in step (1) when the latch releases. If the latch does not release or releases at a value that is not in the range of necessary torque values, replace the defective pressure relief door (Ref. AMM TASK 78-32-80-000-010) and (Ref. AMM TASK 78-32-80-400-010).

5. Close-up
Subtask 78-32-80-440-051-A ** ON A/C NOT FOR ALL

A. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 78-32-80-410-052-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(3) Remove the WARNING NOTICE(S).

Subtask 78-32-80-710-051-A ** ON A/C NOT FOR ALL

C. Operational Test
(1) Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-041).

NOTE: As an alternative procedure, you can do the operational test without the CFDS (Ref. AMM TASK 78-31-00-710-041).

[Rev.10 from 2021] 2026.04.01 12:55:59 UTC