Adjustment of the Thrust Reverser Cowl Latch Tension [CFML]

TASK 78-36-41-820-802-A
Adjustment of the Thrust Reverser Cowl Latch Tension

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

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	GAGE - PUSH-PULL
No specific	1	INSPECTION CREEPER
No specific	1	SCREWDRIVER - FLAT HEAD
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - HEXAGONAL

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
TASK 78-36-46-010-801-A	Opening of the Thrust Reverser Latch Access Doors
TASK 78-36-46-410-801-A	Closing of the Thrust Reverser Latch Access Doors
Adjustment of the Thrust Reverser Latch Tension

3. Job Set-up
Subtask 78-36-41-941-068-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 78-36-41-010-083-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 78-36-41-040-070-A

C. Deactivation of the Thrust Reverser System 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 nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 78-36-41-010-084-A

D. Get Access
(1) Put the INSPECTION CREEPER in position.
(2) Open the 6 o'clock rear and forward latch access doors (Ref. AMM TASK 78-36-46-010-801).

4. Procedure
Subtask 78-36-41-820-059-A

CAUTION: DO NOT MEASURE THE FORCE WHEN THE LATCH HANDLE IS FULLY CLOSED. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EQUIPMENT CAN OCCUR.

A. Adjustment of the Thrust Reverser Latch Tension

NOTE: Make sure that all the latches are fully closed.

(1) Adjustment of the latch L2 (1) tension:

NOTE: This procedure is given for latch L2. It is also applicable for latch L1, latch L3-1, latch L3-2, LACC-1 and LACC-2.

(a) Open latch L2 (1).
(b) Install the GAGE - PUSH-PULL (2) on the latch L2 handle (3) tip.
(c) Measure the force necessary to close latch L2 (1) with the GAGE - PUSH-PULL (2).
1 The force necessary to close latch L2 (1) must be between 11 daN (24.73 lbf) and 15 daN (33.72 lbf).
2 If the force is not within the limits, do the adjustment procedure from step 4.A.(1).(d).
(d) Open latch L2 (1).
(e) Push back the keeper (4) to disengage the anti-rotation device (5) from the tension nut (6).
(f) Tighten or loosen the tension nut (6) with a WRENCH - HEXAGONAL (10) to increase or decrease the latch L2 (1) tension.
(g) Release the keeper (4) to engage the anti-rotation device (5) with the tension nut (6).
(h) Install the GAGE - PUSH-PULL (2) on the latch L2 handle (3) tip.
(i) Measure the force necessary to close latch L2 (1) with the GAGE - PUSH-PULL (2).
1 If the force is not within the limits, repeat the procedure steps 4.A.(1).(d) thru 4.A.(1).(i).
(2) Adjustment of the latch L4-1 (7) tension:

NOTE: This procedure is given for latch L4-1. It is also applicable for latch L4-2.

(a) Open latch L4-1 (7).
(b) Install the GAGE - PUSH-PULL (2) on the hole of the latch L4-1 handle (8) tip.
(c) Measure the force necessary to close latch L4-1 (7) with the GAGE - PUSH-PULL (2).
1 The force necessary to close latch L4-1 (7) must be between 11 daN (24.73 lbf) and 15 daN (33.72 lbf).
2 If the force is not within the limits, do the procedure from step 4.A.(2).(d).
(d) Open latch L4-1 (7).
(e) Turn the adjustable take-up (9) to increase or decrease the latch L4-1 (7) tension with a SCREWDRIVER - FLAT HEAD (11).
(f) Install the GAGE - PUSH-PULL on the latch L4-1 handle (8) tip.
(g) Measure the force to close latch L4-1 (7) with the GAGE - PUSH-PULL (2).

NOTE: If the force is not within the limits, repeat the procedure steps 4.A.(2).(d) thru 4.A.(2).(i).

5. Close-up
Subtask 78-36-41-410-074-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the 6 o'clock rear and forward latch access doors (Ref. AMM TASK 78-36-46-410-801).
(3) Remove the INSPECTION CREEPER.

Subtask 78-36-41-440-064-A

B. Do the reactivation of the thrust reverser after nacelle maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 78-36-41-410-075-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:58:02 UTC