Inspection/Check of the Thrust Reverser Cowl Opening Actuator [CFML]

TASK 78-36-51-200-801-A
Inspection/Check of the Thrust Reverser Cowl Opening 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.

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

ZONE: 400

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ABRASIVE STONE
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	BRUSH - BRISTLED, SOFT
No specific	1	CLOTH-CROCUS
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CPNCL01525)	dry cleaning solvent (MIL-PRF-680)
(Material No.CPNCL01717)	Alodine 1200S

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

D. 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 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
TASK 78-36-51-000-802-A	Removal of the Thrust Reverser Cowl Opening System
TASK 78-36-51-400-802-A	Installation of the Thrust Reverser Cowl Opening System
Thrust Reverser Cowl Opening Actuator

3. Job Set-up
Subtask 78-36-51-941-059-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) Put a WARNING NOTICE(S) 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) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 78-36-51-010-066-A

B. Get Access
(1) Open the fan cowl doors (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) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 78-36-51-040-061-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 78-36-51-010-067-A

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

4. Procedure
Subtask 78-36-51-210-052-A

A. General Visual Inspection of the Thrust Reverser Cowl Opening Actuator
(1) Examine the surfaces of the bonded or anodized parts for wear through base metal.
(2) Examine for the loose press fit bearings and pins.
(3) Examine the sealing surfaces and flanges for nicks, dents and scratches.
(4) Examine the openings for corrosion and unwanted particles.
(5) Examine for signs of leakage.

NOTE: An external leakage is not allowed, but a wet surface not sufficient to cause a drop (except at the shaft seals) is permitted.

(6) Do the visual inspection as mentioned below:
(a) Do checks with a bright light and 5X or more than 5X magnification.

Subtask 78-36-51-210-053-A

B. Checks of the Thrust Reverser Cowl Opening Actuator
(1) Check the specified component parts as per the requirements recorded in the table of the check procedures below:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Visual inspection of the cylinder subassembly (1)	Check the non-sealing surfaces for nicks, burrs and scratches.	Repair or replace the cowl opening system actuator, if damaged (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).
Visual inspection of the inner piston gland (2)	Check the non-sealing surfaces for nicks, burrs and scratches.	Repair or replace the cowl opening system actuator, if damaged (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).
Visual inspection of the accumulator spring retainer (3)	Check the non-sealing surfaces for nicks, burrs and scratches.	Repair or replace the cowl opening system actuator, if damaged (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).
Visual inspection of the outer piston gland (4)	Check the non-sealing surfaces for nicks, burrs and scratches.	Repair or replace the cowl opening system actuator, if damaged (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).
Visual inspection of the inner piston (5)	No damage is permitted on the sealing surfaces.	Replace the cowl opening system actuator, if damaged (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).
	Check the non-sealing surfaces for nicks, burrs and scratches.	Repair or replace the cowl opening system actuator, if damaged (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).
Visual inspection of the outer piston (6)	No damage is permitted on the sealing surfaces.	Replace the cowl opening system actuator, if damaged (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).
	Check the non-sealing surfaces for nicks, burrs and scratches.	Repair or replace the cowl opening system actuator, if damaged (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).
Visual inspection of the rod end subassembly (7)	Check the body for nicks, burrs and scratches.	Repair or replace the cowl opening system actuator, if damaged (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).
Visual inspection of the cable assembly (8)	Check for nicks, cuts, burrs or abrasion.	Replace the cowl opening system actuator, if damaged (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).
Visual inspection of the bonding strap (9)	Check for nicks, cuts, burrs or abrasion.	Replace the cowl opening system actuator, if damaged (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).
Visual inspection of the name plate (10)	Make sure that : The name plate (10) is safely attached. You can read the data on the name plate (10). The name plate (10) contains the correct data.	Replace the cowl opening system actuator, if damaged or missing (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).
Visual inspection of amendment plate (11)	Make sure that : The amendment plate (11) is safely attached. You can read the data on the amendment plate (11). The amendment plate (11) contains the correct data.	Replace the cowl opening system actuator, if damaged or missing (Ref. AMM TASK 78-36-51-000-802) and (Ref. AMM TASK 78-36-51-400-802).

Subtask 78-36-51-350-050-A

C. Repair the damage of the thrust reverser cowl opening actuator.
(1) Repair the nicks, burrs and scratches:

NOTE: This step must be applied to the external surfaces and to the other surfaces which are not seal surfaces.

(a) The burrs must be removed. The raised metal need not be removed completely, but is acceptable if there is a smooth blend to the adjacent shapes.
(b) The nicks and the scratches are permitted on the surfaces that are not seal surfaces if:

The depth of the nicks and the scratches does not decrease the thickness of the surface by more than five percent of the full thickness or 0.25 mm (0.01 in.).
The adjacent burrs are removed.

(c) Repair the small damage that you find on the external surfaces with an ABRASIVE STONE.
1 Polish the damaged areas with the 4/0 CLOTH-CROCUS (specification ANSI-B74.18) or an equivalent.
(d) Fully clean the part with a part cleaning BRUSH - BRISTLED, SOFT and a CPNCL01525dry cleaning solvent (MIL-PRF-680) to remove the remaining contamination from the repair operations. For the aluminum surfaces, apply the Alodine 1200S (Material No.CPNCL01717) on the local area.

5. Close-up
Subtask 78-36-51-410-061-A

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 (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 78-36-51-440-055-A

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

Subtask 78-36-51-410-062-A

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

[Rev.10 from 2021] 2026.04.01 03:37:19 UTC