Adjustment of the Thrust Reverser Latches [PW11]

TASK 78-32-35-820-801-A
Adjustment of the Thrust Reverser Latches

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: ALWAYS USE APPLICABLE GLOVES TO TOUCH HOT PARTS. HOT PARTS CAN CAUSE INJURY TO PERSONS.

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
FIN: 3050KM ** ON A/C NOT FOR ALL
FIN: 3051KM ** ON A/C NOT FOR ALL
FIN: 3052KM ** ON A/C NOT FOR ALL
FIN: 3053KM ** ON A/C NOT FOR ALL
FIN: 3054KM ** ON A/C NOT FOR ALL
FIN: 3055KM ** 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	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, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
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 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Thrust Reverser Latches - Adjustment

3. Job Set-up
Subtask 78-32-35-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 78-32-35-941-054-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-35-010-056-A ** ON A/C NOT FOR ALL

C. 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.

Subtask 78-32-35-040-054-A ** ON A/C NOT FOR ALL

D. Deactivation of the Thrust Reverser for Maintenance

WARNING: MAKE SURE THAT YOU DO THE DEACTIVATION OF THE THRUST REVERSER BEFORE YOU DO MAINTENANCE WORK ON OR AROUND THE THRUST REVERSER. IF YOU DO NOT DO THIS PROCEDURE, THERE IS A RISK OF UNWANTED OPERATION AND THUS OF INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.

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

4. Procedure

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

Subtask 78-32-35-820-050-A ** ON A/C NOT FOR ALL

A. Adjustment of the Thrust Reverser Latches
(1) Make sure that the thrust reverser doors are closed (Ref. AMM TASK 78-36-00-410-802).
(2) Clean the thrust reverser latches.

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, use the AIR SOURCE - REGULATED, FILTERED, DRY to remove the sand and dust particles from the latches.
(3) Open and close each thrust reverser latch from forward to aft. Put a GAGE 45 DAN (100 LBF) - PUSH-PULL at the tool hole located 0.5 in. (12.7 mm) from the edge of the latch handle and measure the force necessary to close each latch. Make sure that the force necessary to close each latch is between 30 lbf (13.3 daN) and 36 lbf (16.0 daN).

NOTE: 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.

(4) If the force to close a latch is not between 30 lbf (13.3 daN) and 36 lbf (16.0 daN), adjust the star wheel on the latch until the force is in the correct range.
(a) Open the applicable latch (Ref. AMM TASK 78-36-00-010-802):
1 FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
2 FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL
(b) Turn the star wheel on the latch that is not in the correct range to increase or decrease the force to close the latch.
(c) Close the applicable latch (Ref. AMM TASK 78-36-00-410-802):
1 FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL
2 FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL
(d) Do Steps 4.A.(3) thru 4.A.(4) again.
(5) Make sure that the thrust reverser doors are closed (Ref. AMM TASK 78-36-00-410-802).

5. Close-up
Subtask 78-32-35-440-053-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 78-32-35-410-054-A ** ON A/C NOT FOR ALL

B. Close Access
(1) 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.
(2) Remove the WARNING NOTICE(S).

Subtask 78-32-35-860-051-A ** ON A/C NOT FOR ALL

C. Put the aircraft back to its initial configuration.
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 03:33:05 UTC