Adjustment of the Thrust Reverser Half Door Latches [CFMB]

TASK 78-36-41-820-042-A
Adjustment of the Thrust Reverser Half Door Latches

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.

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	DYNAMOMETER 14 TO 19 DAN ( 30.27 TO 41.09 LBF) - PUSH
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 40 and 30 lbf.in (0.45 and 0.34 m.daN )
No specific	Torque wrench: range to between 45 and 35 lbf.in (0.51 and 0.40 m.daN )
No specific	Torque wrench: range to between 99 and 81 lbf.in (1.12 and 0.92 m.daN )

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 78-36-42-820-002-A	Adjustment of the LH or R/H Thrust Reverser "J" Ring on Wing
Thrust Reverser Half Door Latches

3. Job Set-up
Subtask 78-36-41-941-053-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 78-36-41-010-056-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 78-36-41-040-053-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 78-36-41-820-051-A ** ON A/C NOT FOR ALL

A. Adjustment of the Thrust Reverser Half Door Latches
(1) Open the four half door latches.
(2) At the two forward latches, remove the screws and the locking washers.
(3) Loosen the tension nuts.
(4) At the center latch, remove the screw and the locking washer.
(5) Loosen the tension nut.
(6) At the aft latch, remove the screw and the locking washer.
(7) Loosen the tension nut.
(8) Make sure the latch hooks are fully engaged in each stirrup. Do not close the latch handles.
(9) TORQUE each tension nut, in sequence from front to rear to between 99 and 81 lbf.in (1.12 and 0.92 m.daN )

.
(10) After the last tension nut has been torqued, do step (9) again.
(11) Do a check.

CAUTION: ALL LOCATING PINS MUST BE IN FULL CONTACT WITH BUSHINGS OR DAMAGE COULD OCCUR TO REVERSER.

(a) Do a check of the centering pins and bushings located on both sides of the door latches.
1 Make sure the surface of the wrenching flat of each centering pin fully touches the surface of each bushing. There should be no space between the surface of the centering pin and the bushing.
2 If the surface of the wrenching flat on the centering pin is not fully against the bushing at each location, do a torque of the latch tension nuts. (refer to step (9) above).
3 If one or two of the centering pins on the forward latch fitting is (are) not in full contact with the bushing, then examine the interface between the C-duct and the engine and adjust the thrust reverser J-ring (Ref. AMM TASK 78-36-42-820-002).
(12) At the forward latches, put the locking washers on the tension nuts and install the screws.
(13) At the center latch, put the locking washer on the tension nut and install the screw.
(14) At the aft latch, put the locking washer on the tension nut and install the screw.
(15) TORQUE the screws to between 40 and 30 lbf.in (0.45 and 0.34 m.daN )

.
(16) Close and lock the thrust reverser half door latches (four locations).

Subtask 78-36-41-820-060-A ** ON A/C NOT FOR ALL

B. Alternate Adjustment of the Thrust Reverser Latches
(1) Open the forward latch.
(2) Remove the screws that attach the locking washers.
(3) Remove the locking washers.
(4) Hand tighten the latch tension nut and put it in a position which permits the installation of the locking washer.
(5) Measure the force on the latch handle tip with the DYNAMOMETER 14 TO 19 DAN ( 30.27 TO 41.09 LBF) - PUSH which is necessary to lock it.
(6) Make sure that the force is between 31.5 lbf (14.01 daN) and 42.7 lbf (18.99 daN).
(7) If the recorded force is not within tolerances turn the latch tension nut to obtain the force indicated.

NOTE: Each one twelfth of a turn of the tension nut will keep the set position of the nut needed for the installation of the locking washer.

(8) Install the locking washer and screw which attach the latch tension nut.
(9) Torque the screw to between 45 and 35 lbf.in (0.51 and 0.40 m.daN )

.
(10) Adjust the three other latches with same procedures as in step 1 through step 9.
(11) Do a check of each latch from the front to the rear.
(12) Make sure that the applied force on the latch handle tip is between 31.5 lbf (14.01 daN) and 42.7 lbf (18.99 daN).

5. Close-up
Subtask 78-36-41-440-053-A ** ON A/C NOT FOR ALL

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

Subtask 78-36-41-410-056-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 03:26:34 UTC