Functional Check of Thrust Reverser Latch Tension [PW11]

TASK 78-32-35-720-801-A
Functional Check of Thrust Reverser Latch Tension

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

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

WARNING: WEAR APPLICABLE PERSONAL PROTECTIVE EQUIPMENT (PPE) WHEN YOU DO THIS TASK. BEFORE YOU USE PPE, READ, UNDERSTAND AND OBEY ALL INSTRUCTIONS FOR ITS USE. THESE INSTRUCTIONS INCLUDE INSTRUCTIONS FROM THE MANUFACTURER, YOUR EMPLOYER AND GOVERNMENT REGULATIONS. YOU CAN GET INJURED IF YOU DO NOT USE PPE. GET INSTRUCTIONS FROM YOUR EMPLOYER ON WHICH PPE IS NECESSARY.

ZONE: 400

1. Reason for the Job
Refer to the MPD TASK: 783200-W5
FUNCTIONAL CHECK OF THRUST REVERSER LATCH TENSION.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	AIR SOURCE - REGULATED, FILTERED, DRY
No specific	1	GAGE 45 DAN (100 LBF) - PUSH-PULL

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Thrust Reverser Latch Test

3. Job Set-up
Subtask 78-32-35-941-053-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 78-32-35-010-055-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 78-32-35-040-053-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805).

4. Procedure

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

Subtask 78-32-35-720-051-A ** ON A/C NOT FOR ALL

A. Functional Test of the Thrust Reverser Latches
(1) Open the thrust reverser latch and pull the latch handle to the fully open position.
(2) Removal of the sand and dust particles from the latch:

WARNING: USE A PROTECTIVE EYE SHIELD OR GOGGLES WHEN YOU USE COMPRESSED AIR. IF YOU GET HIGH-PRESSURE AIR OR PARTICLES IN YOUR EYES, IN YOUR MOUTH OR ON YOUR SKIN, INJURY CAN OCCUR.

CAUTION: IF THERE IS SAND AND/OR DUST ON THE LATCHES, REMOVE THE CONTAMINATION WITH DRY, COMPRESSED AIR BEFORE YOU ADJUST THE LATCHES. SAND AND DUST IN THE LATCHES CAN CAUSE DAMAGE.

(a) If necessary, blow dry with the AIR SOURCE - REGULATED, FILTERED, DRY to remove the sand and dust particles from the latch.
(3) Measure the closing force for each latch as follows:
(a) Make sure that the other latches are closed.
(b) Put the GAGE 45 DAN (100 LBF) - PUSH-PULL at the tool hole located 0.5 in. (12.70 mm) from the edge of the latch handle.

Thrust Reverser Latch Test ** ON A/C NOT FOR ALL

CAUTION: MAKE SURE THAT THE LATCHES CLOSE WITH A FORCE OF NO MORE THAN 50 LBF (22.6 KGF). IF THE FORCE IS TOO HIGH, DAMAGE TO THE EQUIPMENT CAN OCCUR.

(c) Measure the force necessary to close each latch with the GAGE 45 DAN (100 LBF) - PUSH-PULL. Make sure that the GAGE 45 DAN (100 LBF) - PUSH-PULL is perpendicular to the latch handle when you measure the force to close the latch.
1 Make sure that the force necessary to close each latch is between 30 lbf (13.34 daN) and 36 lbf (16.01 daN). Measure the force on latches in the sequence that follows:

Thrust Reverser Latch Test ** ON A/C NOT FOR ALL

NOTE: Make sure that the other latches are closed before you measure the next latch.

a Measure the force to close the L1A latch.
b Measure the force to close the L1B latch.
c Measure the force to close the L2 latch.
d Measure the force to close the L3 latch.
e Measure the force to close the L4 latch.
f Measure the force to close the L5 latch.
(d) If the force is not between 30 lbf (13.34 daN) and 36 lbf (16.01 daN) on a latch, adjust the latch force as follows:
1 Turn the star wheel on the latch to adjust the closing force to between 30 lbf (13.34 daN) and 36 lbf (16.01 daN).
2 Do the Step 4.A.(3) again for each latch to make sure that the latch adjustment did not make another latch to be out of adjustment.
(4) Close the BLS latch and other open latches, if necessary. Make sure all latches are closed (Ref. AMM TASK 78-36-00-410-802).

5. Close-up
Subtask 78-32-35-440-052-A ** ON A/C NOT FOR ALL

A. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 78-32-35-410-053-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) Remove the access platform(s).
(3) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:33:04 UTC