Inspection of the Thrust Reverser Half Door Latches [CFMB]

TASK 78-36-41-820-043-A
Inspection of the Thrust Reverser Half Door Latches

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	AR	GAGE 25 DAN (50 LBF) - PUSH
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-41-820-042-A	Adjustment of the Thrust Reverser Half Door Latches
Thrust Reverser Half Door Latches

3. Job Set-up
Subtask 78-36-41-941-054-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 78-36-41-010-057-A ** ON A/C NOT FOR ALL

B. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 78-36-41-040-054-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

4. Procedure
Subtask 78-36-41-820-052-A ** ON A/C NOT FOR ALL

A. Inspection of the thrust reverser half door latches

NOTE: This procedure should only be used to check the thrust reverser half door latch adjustment and not used to adjust the half door latches.

(1) Release the forward latch. The other three latches are to stay locked.
(2) Place the GAGE 25 DAN (50 LBF) - PUSH on the tip of the latch handle.
(3) Push the push gage to close the forward latch. Read the maximum force indication on the push gage dial.
(4) The force required to close the latch must be between 31.4 lbf (13.97 daN) to 42.7 lbf (19 daN).
(5) Do a check of each latch from the front to the rear. Refer to steps (1) through (4).
(6) If the force required to close a latch is not satisfactory, adjust the latch (Ref. AMM TASK 78-36-41-820-042).

5. Close-up
Subtask 78-36-41-440-054-A ** ON A/C NOT FOR ALL

A. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 78-36-41-410-057-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 cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:26:35 UTC