Removal of the Normal-Brake Servovalve Manifold Assembly

TASK 32-42-16-000-001-A
Removal of the Normal-Brake Servovalve Manifold Assembly

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.

ZONE: 731
ZONE: 741
FIN: 2612GM
FIN: 2613GM

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 5 L (1.32 USGAL)
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. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
731	L.H MAIN GEAR
741	R.H MAIN GEAR

C. Referenced Information

REFERENCE	DESIGNATION
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 29-23-00-860-001-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
TASK 32-11-43-000-001-A	Removal of the 1M and 2M Harnesses from the MLG Leg
TASK 32-42-21-000-001-A	Removal of the Normal-Brake Pressure Transducer
TASK 32-42-36-000-001-A	Removal of the Normal Brake Safety-Valve
TASK 32-42-48-000-001-A	Removal of the Normal Brake Servovalve
Normal-Brake Servovalve-Manifold Assembly - Location and Detail
Normal-Brake Servovalve-Manifold Assembly - Location and Detail

3. Job Set-up
Subtask 32-42-16-941-050-A

A. Safety Precautions
(1) Put the SAFETY BARRIER(S) in position.
(2) Make sure that the ground safety locks are installed 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 is in the DOWN position
Put a WARNING NOTICE(S) in position in the cockpit to tell persons not to operate the landing gear.

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

Subtask 32-42-16-865-050-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 32-42-16-860-051-A

C. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Make sure that the Green hydraulic system is depressurized (Ref. AMM TASK 29-00-00-864-001).
(2) Depressurize the Green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).

Subtask 32-42-16-010-050-A

D. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT) below the applicable normal-brake servovalve-manifold assembly:
(a) FOR [2613GM] (MANIFOLD-NORM BRK SERVOVALVE,L)
below zone 731
(b) FOR [2612GM] (MANIFOLD-NORM BRK SERVOVALVE,R)
below zone 741.
(2) Disconnect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-001).

4. Procedure
Subtask 32-42-16-020-050-C

A. Removal of the Normal-Brake Servovalve-Manifold Assembly

Normal-Brake Servovalve-Manifold Assembly - Location and Detail

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

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) Make a mark on the electrical connectors (6), (11), (13) and (14) to identify their related installed locations. This will help you during installation.
(2) Disconnect the electrical connectors (6), (11), (13) and (14).
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Put a CONTAINER 5 L (1.32 USGAL) below the applicable manifold assembly (19).
(5) Disconnect the hydraulic unions (1), (2), (4) and (5).
(6) Put the PLUG-BLANKING in each disconnected line end.
(7) Remove the electrical harnesses from the brackets (8) and (16) (Ref. AMM TASK 32-11-43-000-001).
(8) Hold the manifold assembly (19) and the brackets (8) and (16).
(9) Disengage the tab washers (9) and remove the bolts (10). Remove and discard the tab washers (9).
(10) Remove the brackets (8) and (16).
(11) Remove the manifold assembly (19) from the MLG mounting lugs.
(12) If you have to replace the manifold (19), the safety valves (3) and the servovalves (7) and (12):

Remove the pressure transducers (17) and (18) (Ref. AMM TASK 32-42-21-000-001).

(13) If you have to replace the manifold (19) only, remove these items:

The pressure transducers (17) and (18) (Ref. AMM TASK 32-42-21-000-001)
The safety valves (3) (Ref. AMM TASK 32-42-36-000-001)
The servovalves (7) and (12) (Ref. AMM TASK 32-42-48-000-001).

[Rev.10 from 2021] 2026.04.01 00:47:49 UTC