Removal of the Aileron Servo-Control Servovalve

TASK 27-14-51-000-003-A
Removal of the Aileron Servo-Control Servovalve

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: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

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.

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 4M (13 FT)
No specific	AR	CONTAINER 1 L (1/4 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
575KB, 675KB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-23-00-860-001-A	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
Aileron Servo-Control Servovalve

3. Job Set-up
Subtask 27-14-51-941-055-A

A. Safety Precautions
(1) Put the SAFETY BARRIER(S) in position.
(2) Put a WARNING NOTICE(S) in the cockpit to tell persons not to pressurize the Green or the Blue hydraulic systems.
(3) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).

Subtask 27-14-51-860-056-A

B. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Disconnect the Isolation Coupling of the Power Transfer Unit (PTU) (Ref. AMM TASK 29-23-00-860-001).
(2) Make sure that the Green and the Blue hydraulic systems are depressurized (Ref. AMM TASK 29-10-00-864-001) (Ref. AMM TASK 29-10-00-864-003).
(3) Depressurize the Green and the Blue hydraulic system reservoirs (Ref. AMM TASK 29-14-00-614-001).

Subtask 27-14-51-865-056-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B11
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B06
** ON A/C ALL
105VU	FLIGHT CONTROLS/ELAC2/STBY SPLY	16CE2	A02
105VU	FLT CTL/ELAC1/STBY SPLY	16CE1	A01
121VU	FLIGHT CONTROLS/ELAC2/NORM/SPLY	15CE2	R20

Subtask 27-14-51-010-052-A

D. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT) in position below the applicable zone 575(675).
(2) Remove the applicable access panel:

for the left wing, panel 575KB
for the right wing, panel 675KB.

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 27-14-51-020-052-A

A. Removal of the Aileron Servo-Control Servovalve

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(1) Put a CONTAINER 1 L (1/4 USGAL) under the applicable servovalve (3).
(2) Remove and discard the lockwire from the screws (1).
(3) Remove the screws (1) and the washers (2).
(4) Carefully disengage and remove the servovalve (3) from the electrical connector (6) and the aileron servo control.
(5) Remove and discard the packings (4) and (5).
(6) Put the COVER - PROTECTION on the aileron servo-control servovalve interface.

[Rev.10 from 2021] 2026.03.31 23:47:36 UTC