Installation of the Filters of the Valve Blocks

TASK 27-54-53-400-003-A
Installation of the Filters of the Valve Blocks

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

NOTE: The installation procedure for the filter of the valve block 24CV is specified. The installation procedure for the filter of the valve block 23CV is almost the same. If there are differences in the procedures they are specified.

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	ACCESS PLATFORM 3M (10 FT)
No specific	1	CONTAINER - HYDRAULIC FLUID RESISTANT
No specific	1	WARNING NOTICE(S)
No specific	Torque wrench: range to between 4.5 and 4.0 m.daN (33.19 and 29.50 lbf.ft )
98D27803000000	1	LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
No specific	lockwire, corrosion-resistant steel dia. 0.6 mm (0.24 in.)

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	O-RING	AIPC 27-84-53-01-060

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-12-29-611-002-A	Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
TASK 27-00-00-080-002-A	Removal of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
TASK 27-00-00-480-002-A	Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
TASK 27-54-00-710-001-A	Operational Test of the Flap System
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
Filter

3. Job Set-up
Subtask 27-54-53-860-060-A

A. Aircraft Maintenance Configuration
(1) Make sure that the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION is installed (Ref. AMM TASK 27-00-00-480-002) on the slat/flap control lever.
(2) Make sure that the ACCESS PLATFORM 3M (10 FT) is in position at the main gear main door opening.
(3) Make sure that the Green and Yellow hydraulic systems are depressurized and put them in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(4) Make sure that the reservoirs of the Green and the Yellow hydraulic systems are depressurized (Ref. AMM TASK 29-14-00-614-001).
(5) Make sure that the WARNING NOTICE(S) is in position to tell persons not to pressurize the hydraulic systems.
(6) Put a CONTAINER - HYDRAULIC FLUID RESISTANT in position below the Power Control Unit (PCU) (1).

Subtask 27-54-53-865-057-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B07
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B02
** ON A/C ALL
121VU	FLIGHT CONTROLS/FLP/CTL AND/MONG/SYS2	8CV	Q21

4. Procedure
Subtask 27-54-53-420-052-A

A. Installation of the Filter
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the AIPC 27-84-53-01-060 O-RING (2) and to the threads of the filter (3).
(4) Install the new O-ring (2) on the filter (3).
(5) Install the filter (3) complete with the O-ring (2) in the valve block (1).
(6) TORQUE the filter (3) to between 4.5 and 4.0 m.daN (33.19 and 29.50 lbf.ft )

.
(7) Safety the filter (3) with the lockwire, corrosion-resistant steel dia. 0.6 mm (0.24 in.).

Subtask 27-54-53-860-062-A

B. Preparation for the Test
(1) Pressurize the reservoirs of the Green and the Yellow hydraulic systems (Ref. AMM TASK 29-14-00-614-002).
(2) Make sure that the level of the fluid in the relevant hydraulic reservoir is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
(3) Remove the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION (Ref. AMM TASK 27-00-00-080-002) from the slat/flap control lever.
(4) Make sure that the work area is clean and clear of tools and other items.
(5) Remove the WARNING NOTICE(S).

Subtask 27-54-53-865-058-A

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B07
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B02
** ON A/C ALL
121VU	FLIGHT CONTROLS/FLP/CTL AND/MONG/SYS2	8CV	Q21

Subtask 27-54-53-710-052-A

D. Test
(1) Do the operational test of the flap system (Ref. AMM TASK 27-54-00-710-001).
(2) Examine the filter (3) and make sure that there are no leaks.

5. Close-up
Subtask 27-54-53-860-061-A

A. Put the aircraft back to the serviceable condition.
(1) Make sure that the level of the fluid in the relevant hydraulic reservoir is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
(2) Remove the container from below the valve block (1).
(3) Remove the access platform(s).

Subtask 27-54-53-410-052-A

B. Close the main doors of the main gear (Ref. AMM TASK 32-12-00-410-001).

[Rev.10 from 2021] 2026.03.31 23:54:26 UTC