Removal of the Solenoid Valves of the Flap Wing-Tip Brake (WTB)

TASK 27-51-51-000-002-A
Removal of the Solenoid Valves of the Flap Wing-Tip Brake (WTB)

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.

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

CAUTION: BE CAREFUL WHEN YOU DO MAINTENANCE TASKS ON THE WING TRAILING EDGE:

DO NOT CAUSE DAMAGE TO THE ELECTRICAL CABLE RACEWAYS.
DO NOT CAUSE DAMAGE TO THE ELECTRICAL CABLE INSTALLATIONS.
MAKE SURE THAT THE ELECTRICAL CABLES ARE INSTALLED CORRECTLY. INCORRECT INSTALLATION CAN CAUSE DAMAGE.

FIN: 33CV
FIN: 34CV

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D27604000000	1	COLLAR-SAFETY, SPOILER
98D27604004000	1	COLLAR SAFETY SPOILER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [33CV] (WING TIP BRAKE)
575DB, 575EB
FOR [34CV] (WING TIP BRAKE)
675DB, 675EB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 27-50-00-866-008-A	Extension of the Flaps on the Ground
TASK 27-50-00-866-008-A-01	Extension of the Flaps/Slats on the Ground
TASK 27-60-00-866-002-A	Extension-Retraction of the Spoilers for Maintenance
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
Solenoid valve - Flap WTB
FOR [33CV] (WING TIP BRAKE)
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
FOR [34CV] (WING TIP BRAKE)
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System

3. Job Set-up
Subtask 27-51-51-941-058-A

A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Put the WARNING NOTICE(S) in the cockpit to tell persons not to pressurize the hydraulic systems.
(3) Put a WARNING NOTICE(S) in position to tell persons not to operate the flight controls.

Subtask 27-51-51-860-051-A

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Extend the flaps fully (Ref. AMM TASK 27-50-00-866-008).
(3) Install the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION on the flap/slat control lever.
(4) Remove the safety collar from the circuit breakers 10CV and 12CV.

Subtask 27-51-51-865-053-A

C. Open, safety and tag 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/WTB/FLP/SYS2	12CV	P20
121VU	FLIGHT CONTROLS/FLP/CTL AND/MONG/SYS2	8CV	Q21
122VU	FLIGHT CONTROLS/WTB/FLP/SYS1	10CV	S07

Subtask 27-51-51-864-053-A

D. Depressurize the Hydraulic Systems
(1) Depressurize the applicable hydraulic systems:
(a) FOR [33CV] (WING TIP BRAKE)
depressurize the Yellow and the Blue hydraulic systems (Ref. AMM TASK 29-10-00-864-002) (Ref. AMM TASK 29-10-00-864-003)
(b) FOR [34CV] (WING TIP BRAKE)
depressurize the Green and the Blue hydraulic systems (Ref. AMM TASK 29-10-00-864-001) (Ref. AMM TASK 29-10-00-864-003).
(2) Depressurize the applicable hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-001):
(a) FOR [33CV] (WING TIP BRAKE)
depressurize the Yellow and the Blue hydraulic reservoirs
(b) FOR [34CV] (WING TIP BRAKE)
depressurize the Green and the Blue hydraulic reservoirs.

Subtask 27-51-51-010-053-A

E. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT) in position:

for the left wing, below zone 580
for the right wing, below zone 680.

(2) Remove the access panels:
(a) FOR [33CV] (WING TIP BRAKE)
remove 575DB 575EB
(b) FOR [34CV] (WING TIP BRAKE)
remove 675DB 675EB.
(3) Put the No. 3 spoiler into the 'M' (Maintenance) position (Ref. AMM TASK 27-60-00-866-002).
(4) Put the 98D27604000000 COLLAR-SAFETY, SPOILER or 98D27604004000 COLLAR SAFETY SPOILER on the piston rod of the servo-control.

4. Procedure

CAUTION: BE CAREFUL WHEN YOU DO MAINTENANCE TASKS ON THE WING TRAILING EDGE:

DO NOT CAUSE DAMAGE TO THE ELECTRICAL CABLE RACEWAYS.
DO NOT CAUSE DAMAGE TO THE ELECTRICAL CABLE INSTALLATIONS.
MAKE SURE THAT THE ELECTRICAL CABLES ARE INSTALLED CORRECTLY. INCORRECT INSTALLATION CAN CAUSE DAMAGE.

Subtask 27-51-51-020-051-B

A. Removal of the Solenoid Valve
(1) Remove the screws (9).
(2) Use one of the screws (9) in the hole (8) to help you to remove the solenoid valve (7).
(3) Remove the screw (9) from the hole (8).
(4) Remove and discard the O-rings (1), (3), (5) and (6), and the back-up rings (2) and (4).
(5) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.03.31 23:52:56 UTC