Deactivation of the Cowl Opening Actuator [CFMB]

TASK 78-36-00-040-801-B
Deactivation of the Cowl Opening Actuator

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
CDL 78-01
THRUST REVERSER OPENING ACTUATOR
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	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 120 and 100 lbf.in (1.36 and 1.13 m.daN )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 27-80-00-866-005-A	Retracting the Slats on the Ground
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 78-36-00-010-804-B	Opening of the Thrust Reverser Doors with One or More Door Opening Actuator(s) Defective
TASK 78-36-00-410-804-B	Closing of the Thrust Reverser Doors with One or More Door Opening Actuator(s) Defective
TASK 78-36-51-000-041-A	Removal of the Thrust Reverser Half Door Opening Actuator
Capping of the Disconnected Inner Supply Pipe of the Cowl Opening Actuator System

3. Job Set-up
Subtask 78-36-00-941-061-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) On 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) in position to tell persons not to energize FADEC 1(2).

Subtask 78-36-00-010-094-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 78-36-00-866-052-A ** ON A/C NOT FOR ALL

C. Retraction of the Wing Slats

CAUTION: RETRACT WING SLATS BEFORE OPENING THRUST REVERSER OR DAMAGE CAN OCCUR.

(1) Retract the wing slats (Ref. AMM TASK 27-80-00-866-005) and put a WARNING NOTICE(S) in position.

Subtask 78-36-00-040-070-A ** ON A/C NOT FOR ALL

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

Subtask 78-36-00-010-095-A ** ON A/C NOT FOR ALL

E. Open the thrust reverser doors with one or more door opening actuator(s) defective (Ref. AMM TASK 78-36-00-010-804):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

4. Procedure
Subtask 78-36-00-040-071-A ** ON A/C NOT FOR ALL

A. Deactivation of the Cowl Opening Actuator

Capping of the Disconnected Inner Supply Pipe of the Cowl Opening Actuator System ** ON A/C NOT FOR ALL

CAUTION: COVER THE CORE ENGINE COMPRESSOR CASE WITH A PROTECTIVE COVER TO MAKE SURE THAT HYDRAULIC FLUID DOES NOT LEAK ONTO THE COMPRESSOR CASE.

(1) Install COVER - PROTECTION over the compressor cases of the core.
(2) Remove the cowl opening actuator (Ref. AMM TASK 78-36-51-000-041).
(3) Cap the disconnected inner supply pipe with flareless tube cap (MS21914-4J).
(4) TORQUE the tube cap (MS21914-4J) to between 120 and 100 lbf.in (1.36 and 1.13 m.daN )

.
(5) Remove the COVER - PROTECTION.

5. Close-up
Subtask 78-36-00-410-079-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 thrust reverser cowl doors with one or more door opening actuator(s) defective (Ref. AMM TASK 78-36-00-410-804):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 78-36-00-440-063-A ** ON A/C NOT FOR ALL

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

Subtask 78-36-00-410-080-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Remove the access platform(s).
(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).
(4) Make an entry in the logbook to tell that you did the cowl-opening actuator- deactivation procedure.

[Rev.10 from 2021] 2026.04.01 03:26:25 UTC