Installation of the Latch Fitting and Latch Back Plate [CFMB]

TASK 78-32-41-400-003-A
Installation of the Latch Fitting and Latch Back Plate

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

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	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 80 and 70 lbf.in (0.90 and 0.79 m.daN )
No specific	Torque wrench: range to between 173 and 130 lbf.in (1.95 and 1.47 m.daN )
HIX3005	1	SAFETY SLEEVE - PIVOTING DOOR ACTUATOR

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2104)	molykote G rapid
(Material No.CP2245)	finish paint EA4 blue 5991
(Material No.06LCG9)	Non Hardening Jointing Putty-Medium Temp. Area - -

C. Work Zones and Access Panels

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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
10	COTTER PIN	AIPC 78-32-41-01-140

E. 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 78-31-00-710-042-A	Operational Test of the Thrust Reverser System
TASK 78-31-00-710-043-A-01	Operational Test of the Thrust Reverser without CFDS - Engine Running
TASK 78-31-00-710-043-A	Operational Test of the Thrust Reverser without CFDS - Engine Not Running
TASK 78-31-00-710-043-A-01	Operational Test of the Thrust Reverser without CFDS - Engine Running
TASK 78-32-41-080-001-A	Removal of the Safety Sleeve from Blocker Door Actuator
TASK 78-32-41-820-001-A	Alignment of the Blocker Door
TASK 78-32-41-860-002-A	Manual Stowing of the Blocker Door
Latch Fitting and Latch Back Plate

3. Job Set-up
Subtask 78-32-41-860-055-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 78-32-41-010-064-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-41-040-063-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 78-32-41-420-052-A ** ON A/C NOT FOR ALL

CAUTION: DO NOT PUSH ON THE STOW SWITCH LEVER WHEN BLOCKER DOOR IS OPENED OR DAMAGE COULD OCCUR.

A. Installation of the Latch Fitting and Latch Back Plate

NOTE: Apply a witness line of finish paint EA4 blue 5991 (Material No.CP2245) on all nuts and connections when you have done the check of their torques.

(1) Apply a thin layer of Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) on the back of the latch back plate.
(2) Attach the latch back plate to the blocker door with the screws, the washers and the nuts.
(3) TORQUE the screws to between 80 and 70 lbf.in (0.90 and 0.79 m.daN )

.
(4) Install the roller:

CAUTION: MAKE SURE NOT TO APPLY LUBRICANT ON THREADS OF BOLT OR TORQUE WILL BE CHANGED. SEIZING OF ROLLER COULD OCCUR AND DAMAGE OF BLOCKER DOOR LATCH COULD RESULT.

(a) Apply a thin layer of molykote G rapid (Material No.CP2104) on shank of the bolt.
(b) Install the roller on the latch fitting between the lugs.
(c) Install the roller bolt, the washer and the nut.
(d) TORQUE the nut to between 173 and 130 lbf.in (1.95 and 1.47 m.daN )

.
(5) Install a new AIPC 78-32-41-01-140 COTTER PIN (10).
(6) Attach the latch fitting to the latch back plate with the bolts, the washers and the nuts.
(7) TORQUE the bolts to between 80 and 70 lbf.in (0.90 and 0.79 m.daN )

NOTE: Make sure that there is no lubricant on the roller and the roller turns freely.

(8) Remove the HIX3005 SAFETY SLEEVE - PIVOTING DOOR ACTUATOR from the blocker door actuator without making thrust reverser operational (Ref. AMM TASK 78-32-41-080-001).
(9) Install the upper blocker door:

CAUTION: BLOCKER DOOR LATCH MUST BE OPENED WHEN YOU CLOSE THE BLOCKER DOOR OR DAMAGE CAN OCCUR.

(a) Manually move the blocker door to the closed position (Ref. AMM TASK 78-32-41-860-002).
(10) Make sure that the blocker door is correctly aligned (Ref. AMM TASK 78-32-41-820-001).

5. Close-up
Subtask 78-32-41-440-057-A ** ON A/C NOT FOR ALL

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

Subtask 78-32-41-410-058-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 access platform(s).
(4) Remove the WARNING NOTICE(S).

Subtask 78-32-41-710-057-A ** ON A/C NOT FOR ALL

C. Do an operational test:
(1) Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-042).

NOTE: As an alternative procedure you can do this operational test without the CFDS:

first method with engine not running (Ref. AMM TASK 78-31-00-710-043)
second method with engine running (Ref. AMM TASK 78-31-00-710-043).

[Rev.10 from 2021] 2026.04.01 03:26:05 UTC