Installation of the Cowl Latches [CFMI]

TASK 78-36-41-400-040-A
Installation of the Cowl 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	ACCESS PLATFORM 1M(3 FT)
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 44 and 36 lbf.in (0.50 and 0.41 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2245)	finish paint EA4 blue 5991

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 462AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
10	COTTER PIN	AIPC 78-36-41-01-080
20	COTTER PIN	AIPC 78-36-41-01-080

E. Referenced Information

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

3. Job Set-up
Subtask 78-36-41-860-053-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 78-36-41-010-075-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the right thrust reverser cowl door is open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
452AR
(b) FOR [1000EM2] (ENGINE-2)
462AR

Subtask 78-36-41-040-066-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 78-36-41-420-053-A ** ON A/C NOT FOR ALL

A. Installation of the Cowl Latches

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

(1) Install the forward and middle latches:
(a) Install the latches.
(b) Install the axes and nuts.
(c) Tighten until clearance between nut and structure is from 0.05 mm (0.002 in.) to 0.23 mm (0.01 in.).
(d) Secure with new AIPC 78-36-41-01-080 COTTER PIN (20) or AIPC 78-36-41-01-080 COTTER PIN (10).
(2) Install the aft latch:
(a) Position the latch on the door.

PRE SB RA32078-38

(b) Install the axe and nut.
(c) Tighten until clearance between nut and structure is from 0.05 mm (0.002 in.) to 0.23 mm (0.01 in.).
(d) Secure with new AIPC 78-36-41-01-080 COTTER PIN (10) .
(e) Install the access door and secure with bolt.
(f) TORQUE bolt to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

.

POST SB RA32078-38

(g) Install the pin.
(h) Install the bracket and secure with bolt.
(i) TORQUE bolt to between 40 and 30 lbf.in (0.45 and 0.34 m.daN )

.

END SB RA32078-38

5. Close-up
Subtask 78-36-41-410-060-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right thrust reverser cowl door (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
452AR
(b) FOR [1000EM2] (ENGINE-2)
462AR

Subtask 78-36-41-440-056-A ** ON A/C NOT FOR ALL

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

Subtask 78-36-41-410-061-A ** ON A/C NOT FOR ALL

C. Close Access
(1) 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
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.02 06:38:12 UTC