Removal of the Normal Brake Servovalve

TASK 32-42-48-000-001-A
Removal of the Normal Brake 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.

FIN: 15GG
FIN: 16GG
FIN: 17GG
FIN: 18GG

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	AR	CAP - BLANKING
No specific	1	CONTAINER 3 L(3/4 USGAL)
No specific	1	COVER - PROTECTION
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A	Depressurize the Yellow 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)
TASK 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
Normal-Brake Servovalve

3. Job Set-up
Subtask 32-42-48-941-050-A

A. Safety Precautions
(1) Put the SAFETY BARRIER(S) in position.
(2) Make sure that the safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On the panel 400VU:

make sure that the landing-gear control-lever 6GA is in the DOWN position
put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear.

(4) Put WARNING NOTICE(S) on the ground service connection to tell persons not to pressurize the Green hydraulic system.

Subtask 32-42-48-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33

Subtask 32-42-48-860-053-A

C. Aircraft Maintenance Configuration
(1) Disconnect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-001).
(2) Depressurize the Yellow and Green hydraulic systems (Ref. AMM TASK 29-10-00-864-001) and (Ref. AMM TASK 29-10-00-864-002).
(3) Depressurize the applicable hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-001).

Subtask 32-42-48-010-050-A

D. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT) below the applicable servovalve, at zone 730 or 740.
(2) Put a CONTAINER 3 L(3/4 USGAL) below the servovalve.

4. Procedure
Subtask 32-42-48-020-051-A

A. Removal of the Normal Brake Servovalve

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.

(1) If you are to remove the servovalve 15GG(16GG), disconnect the electrical connector (4) from the servovalve 17GG(18GG).
(2) Disconnect the electrical connector (4) from the servovalve that is to be removed.
(3) Put a CAP - BLANKING on the disconnected electrical connectors.
(4) Remove the bolts (5) and the servovalve (1).
(5) Remove and discard the seals (3) and the rings (2).
(6) Put a PLUG - BLANKING on the disconnected line ends.
(7) Put a COVER - PROTECTION on the normal brake manifold to prevent damage and to keep it clean.

[Rev.10 from 2021] 2026.04.01 00:48:13 UTC