Unlocking of the Right Lower Actuator (Synchronized Manual Locking Actuator) [CFML]

TASK 78-31-43-440-802-A
Unlocking of the Right Lower Actuator (Synchronized Manual Locking Actuator)

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.

1. Reason for the Job
A. This procedure gives the instructions to unlock the right lower actuator. This actuator is also known as the synchronized manual locking actuator.
B. When the synchronized manual locking actuator is locked, the translating cowl cannot move manually or hydraulically. You can lock the synchronized manual locking actuator as a safety precaution before you do maintenance.
C. The locking procedure is only done during maintenance. When maintenance is complete, you must do the unlocking procedure. Never permit flight with a synchronized manual locking actuator in the locked condition.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
Locking-Unlocking of the Right Lower Actuator (Synchronized Manual Locking Actuator)

3. Job Set-up
Subtask 78-31-43-941-053-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 78-31-43-010-056-A

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

4. Procedure
Subtask 78-31-43-440-051-A

A. Unlocking of the Right Lower Actuator (Synchronized Manual Locking Actuator)

Locking-Unlocking of the Right Lower Actuator (Synchronized Manual Locking Actuator)

WARNING: DO NOT PUT YOUR FINGERS BETWEEN THE YELLOW LOCK HANDLE AND THE BODY OF THE SYNCHRONIZED MANUAL LOCKING ACTUATOR. THE LOCK HANDLE CAN MOVE BACK SUDDENLY AND CAUSE AN INJURY.

(1) Carefully push the yellow lock handle (2) into position against the body of the right lower actuator (1). Keep you fingers on the outboard side of the lock handle.

5. Close-up
Subtask 78-31-43-440-053-A

A. Do the reactivation of the thrust reverser system after nacelle maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 78-31-43-410-052-A

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 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:35:14 UTC