Removal of the Solenoid Valves of the Power Control Unit (Slat)

TASK 27-84-53-000-002-A
Removal of the Solenoid Valves of the Power Control Unit (Slat)

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 removal procedure for the retract solenoid valve of the valve block 25CV is given. The removal procedure for the extend solenoid valve, the brake solenoid valve and the solenoid valves of the valve block 26CV are almost the same. The differences in the procedures are given.

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)- ADJUSTABLE
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D27803000000	1	LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION

B. Referenced Information

REFERENCE	DESIGNATION
TASK 27-00-00-480-002-A	Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
TASK 27-80-00-866-005-A	Retracting the Slats on the Ground
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 32-12-00-010-001-A	Open the Main Gear Doors for Access
Solenoid Valve

3. Job Set-up
Subtask 27-84-53-866-051-A

A. Retraction of the Slats
(1) Retract the slats to the 0 degree position (Ref. AMM TASK 27-80-00-866-005).
(2) Install the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION (Ref. AMM TASK 27-00-00-480-002) on the slat/flap control lever.

Subtask 27-84-53-865-053-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1	5CV	B06
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/SLT/CTL AND MONG/SYS1	5CV	B01
** ON A/C ALL
121VU	FLIGHT CONTROLS/SLT/CTL/SYS2	7CV	R21

Subtask 27-84-53-010-051-A

C. Open the main doors of the main gear (Ref. AMM TASK 32-12-00-010-001).

Subtask 27-84-53-860-051-A

D. Aircraft Maintenance Configuration
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the opening of the main door of the main gear.
(2) Make sure that the Green and the Blue hydraulic systems are depressurized and put them in the maintenance configuration. (Ref. AMM TASK 29-00-00-864-001).
(3) Depressurize the reservoirs of the Green and the Blue hydraulic systems (Ref. AMM TASK 29-14-00-614-001).
(4) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the hydraulic systems.
(5) Put a CONTAINER 5 L (1.32 USGAL) in position below the valve block (12).

4. Procedure
Subtask 27-84-53-020-051-B

A. Removal of the Solenoid Valve

CAUTION: DO NOT INSTALL THE REMOVED SOLENOID VALVES WITH THE PARTNUMBER 903A0000-01 ON THE WING TIP BRAKE. THIS CAN CAUSE MALFUNCTION OF THE WING TIP BRAKE.

(1) Remove the bolts (4).
(2) Install one of the bolts (4) in hole "A" in the solenoid valve (1).
(3) Use this bolt and carefully remove the solenoid valve (1) from the valve block (12).
(4) Remove the bolt (4) from the hole in the solenoid valve (1).
(5) Remove and discard the O-rings (9),(10),(15),(16) and the back-up rings (7),(6) from the solenoid valve (1).

[Rev.10 from 2021] 2026.03.31 23:57:45 UTC