Examine the Thrust Reverser C-Duct Locking Actuator for Hydraulic Fluid Leakage [IAE]

TASK 78-32-43-200-010-A
Examine the Thrust Reverser C-Duct Locking Actuator for Hydraulic Fluid Leakage

1. Reason for the Job
This TASK supplies hydraulic fluid leakage limits for the left and right c-duct locking actuator. Leakage can occur from the forward end cap/jack head interface or rod end seals. A small amount of leakage is acceptable for a limited continued service.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-31-00-710-041-A	Operational Test of the Thrust Reverser System with the CFDS
TASK 78-31-00-710-041-A-02	Operational test of the Thrust Reverser without the CFDS and Engine Running
TASK 78-31-00-710-041-A	Operational Test of the Thrust Reverser System with the CFDS
TASK 78-31-00-710-041-A-02	Operational test of the Thrust Reverser without the CFDS and Engine Running
Illustration of the Locking Actuator Access Panel

3. Job Set-up
Subtask 78-32-43-010-053-A ** ON A/C NOT FOR ALL

A. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 78-32-43-040-052-A ** ON A/C NOT FOR ALL

B. Deactivate the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 78-32-43-010-054-A ** ON A/C NOT FOR ALL

C. Remove the translating sleeve actuator access panel.

Illustration of the Locking Actuator Access Panel ** ON A/C NOT FOR ALL

(1) FOR [1000EM1] (ENGINE-1)
451CL 452CR
(2) FOR [1000EM2] (ENGINE-2)
461CL 462CR.

Subtask 78-32-43-110-050-A ** ON A/C NOT FOR ALL

D. Use a clean Textile-Lint free Cotton - (Material No.14SBA1) to rub the actuators clean.

Subtask 78-32-43-440-051-A ** ON A/C NOT FOR ALL

E. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012)

4. Procedure
Subtask 78-32-43-010-055-A ** ON A/C NOT FOR ALL

A. Extend and retract the translating sleeve for one minute with the power on (Ref. AMM TASK 78-31-00-710-041)

Subtask 78-32-43-040-053-A ** ON A/C NOT FOR ALL

B. Deactivate the Thrust Reverser

(1) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 78-32-43-210-052-A ** ON A/C NOT FOR ALL

C. Check for Leaks using the Following Limits

	FOR NORMAL OPERATION	FOR DISPATCH TO AVOID DELAY
Static Seals	None	2 Drops per 10 minutes
Rod seal (system pressurized)	1 Drop per minute	30 Drops per minute
Rod seal(in operation)	1 Drop per cycle	2 Drops per cycle

5. Close-up
Subtask 78-32-43-410-054-A ** ON A/C NOT FOR ALL

A. Install the actuator access panels

Illustration of the Locking Actuator Access Panel ** ON A/C NOT FOR ALL

(1) FOR [1000EM1] (ENGINE-1)
451CL 452CR
(2) FOR [1000EM2] (ENGINE-2)
461CL 462CR.

Subtask 78-32-43-410-055-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 cowls (Ref. AMM TASK 71-13-00-410-010).
(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 78-32-43-710-053-A ** ON A/C NOT FOR ALL

C. Operational Test
(1) Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-041).

NOTE: As an alternative procedure, you can do the operational test without the CFDS (Ref. AMM TASK 78-31-00-710-041).

[Rev.10 from 2021] 2026.04.01 03:28:31 UTC