Installation of the Normal-Brake Servovalve Manifold Assembly

TASK 32-42-16-400-001-A
Installation of the Normal-Brake Servovalve Manifold Assembly

WARNING: MAKE SURE THAT THE SAFETY DEVICES AND THE WARNING NOTICES ARE IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.8 and 1.6 m.daN (13.27 and 11.80 lbf.ft )
No specific	Torque wrench: range to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )
No specific	Torque wrench: range to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06AEA1)	Polysulfide Sealant-Low Adhesion Brushable -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
9	TAB WASHERS	AIPC 32-11-11-85-020
9	TAB WASHERS	AIPC 32-11-85-85-020

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 29-10-00-864-001-A	Depressurize the Green 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 29-23-00-860-002-A	Connection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 32-00-00-081-001-A	Removal of the Safety Devices from the Landing Gears
TASK 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
TASK 32-11-43-400-002-A	Installation of the 1M and 2M Harnesses on the MLG Leg
TASK 32-42-00-710-001-A	Operational Check of the Normal Braking System
TASK 32-42-00-710-003-A	Operational Check of Antiskid Inhibition
TASK 32-42-00-720-002-A	Functional Test of the Tachometers and the Anti-Skid System with the Normal Braking System ON
TASK 32-42-00-870-001-A	Bleeding of the Normal Braking at the Brake Units
TASK 32-42-21-400-001-A	Installation of the Normal-Brake Pressure Transducer
TASK 32-42-36-400-001-A	Installation of the Normal Brake Safety-Valve
TASK 32-42-48-400-001-A	Installation 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 32-42-16-941-051-A

A. Safety Precautions
(1) Make sure that the SAFETY BARRIER(S)S are 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 6GA is in the DOWN position
make sure that the WARNING NOTICE(S) is in position in the cockpit to tell persons not to operate the landing gear.

(4) Make sure that WARNING NOTICE(S)S are in position to tell persons not to pressurize the Green hydraulic system.

Subtask 32-42-16-860-052-A

B. Aircraft Maintenance Configuration
(1) Make sure the Green hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-001).
(2) Make sure that the Green hydraulic reservoir is depressurized (Ref. AMM TASK 29-14-00-614-001).
(3) Make sure that the access platform is in position below the applicable normal-brake servovalve-manifold assembly.
(4) Make sure the isolation coupling of the PTU is disconnected (Ref. AMM TASK 29-23-00-860-001).

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

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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

4. Procedure
Subtask 32-42-16-420-050-C

A. Preparation for Installation

Normal-Brake Servovalve-Manifold Assembly - Location and Detail

(1) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) and Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean the component interface and/or the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) If you install a new manifold assembly (19), new safety valves (3) and new servovalves (7) and (12):

Remove the PLUG - BLANKING and install the pressure transducers (17) and (18) (Ref. AMM TASK 32-42-21-400-001).

(5) If you install a new manifold assembly (19) only, remove the PLUG - BLANKING and install these items:

The pressure transducers (17) and (18) (Ref. AMM TASK 32-42-21-400-001)
The safety valves (3) (Ref. AMM TASK 32-42-36-400-001)
The servovalves (7) and (12) (Ref. AMM TASK 32-42-48-400-001).

Subtask 32-42-16-420-051-C ** ON A/C NOT FOR ALL

B. Installation of the Normal-Brake Servovalve-Manifold Assembly

Normal-Brake Servovalve-Manifold Assembly - Location and Detail ** ON A/C NOT FOR ALL

(1) Remove the PLUG - BLANKING from the hydraulic line end-fittings and the CAP - BLANKING from the electrical connectors.
(2) Make sure that the hydraulic line end-fittings are serviceable.
(3) Apply Polysulfide Sealant-Low Adhesion Brushable - (Material No.06AEA1) to the interfaces of the manifold assembly (19) and the MLG mounting lugs.

NOTE: You must install the manifold assembly (19) on the MLG mounting lugs when the sealant is wet.

(4) Hold the manifold assembly (19) in position on the MLG mounting lugs.
(5) Install the items that follow:

The brackets (8) and (16)
The new AIPC 32-11-11-85-020 TAB WASHERS (9)
The bolts (10).

(6) TORQUE the bolts (10) to between 1.8 and 1.6 m.daN (13.27 and 11.80 lbf.ft )

.
(7) Safety the bolts (10) with the tab washers (9).
(8) Install the electrical harnesses on the brackets (8) and (16) (Ref. AMM TASK 32-11-43-400-002).
(9) Examine the electrical harnesses for correct routing and installation.
(10) Connect the hydraulic unions (1) and (2).
(11) TORQUE the hydraulic union (1) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(12) TORQUE the hydraulic union (2) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

.
(13) Connect the hydraulic unions (4) and (5) as follows:

Normal-Brake Servovalve-Manifold Assembly - Location and Detail ** ON A/C NOT FOR ALL

(a) Connect the hydraulic unions (4) and (5) to their related hydraulic ports.
(b) Make sure that the hydraulic ports are correctly connected to their related wheel brakes.
(c) Examine the hydraulic lines and the flexible pipes for correct routing

NOTE: This will prevent an incorrect connection of the hydraulic lines downstream of the manifold assembly (19).

(d) TORQUE the hydraulic unions (4) and (5) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(14) Examine the routings of the hydraulic lines for correct installation. Make sure that the hydraulic lines do not touch the MLG leg or each other.
(15) Paint a red line across the hydraulic unions that you have torqued (Ref. AMM TASK 20-23-22-910-001).
(16) Refer to the tables to connect the electrical connectors (6), (11), (13) and (14):

Normal-Brake Servovalve-Manifold Assembly - Location and Detail ** ON A/C NOT FOR ALL

CAUTION: MAKE SURE THAT THE SERVO-VALVE AND PRESSURE-TRANSDUCER ELECTRICAL CONNECTORS ARE CORRECTLY CONNECTED TO THEIR RELATED EQUIPMENT. IF THE ELECTRICAL CONNECTORS ARE INCORRECTLY CONNECTED, DAMAGE TO THE BRAKE ANTI-SKID SYSTEM WILL OCCUR.

(a) Identify and connect each of the electrical connectors (6) and (11) to their related servovalves (7) and (12).
(b) Identify and connect each of the electrical connectors (13) and (14) to their related pressure transducers (17) and (18).

Subtask 32-42-16-420-051-F ** ON A/C NOT FOR ALL

B. Installation of the Normal-Brake Servovalve-Manifold Assembly
(1) Remove the PLUG - BLANKING from the hydraulic line end-fittings and the CAP - BLANKING from the electrical connectors.
(2) Make sure that the hydraulic line end-fittings are serviceable.
(3) Apply Polysulfide Sealant-Low Adhesion Brushable - (Material No.06AEA1) to the interfaces of the manifold assembly (19) and the mounting lugs of the MLG leg assembly.

NOTE: You must install the manifold assembly (19) on the MLG mounting lugs when the sealant is wet.

(4) Hold the manifold assembly (19) in position on the MLG mounting lugs.
(5) Install the items that follow:

The brackets (8) and (16)
The new AIPC 32-11-85-85-020 TAB WASHERS (9) or AIPC 32-11-11-85-020 TAB WASHERS (9)
The bolts (10).

(6) TORQUE the bolts (10) to between 1.8 and 1.6 m.daN (13.27 and 11.80 lbf.ft )

.
(12) TORQUE the hydraulic union (2) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

.
(13) Connect the hydraulic unions (4) and (5) as follows:

Normal-Brake Servovalve-Manifold Assembly - Location and Detail ** ON A/C NOT FOR ALL

NOTE: This will prevent an incorrect connection of the hydraulic lines downstream of the manifold assembly (19).

(d) TORQUE the hydraulic unions (4) and (5) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

Normal-Brake Servovalve-Manifold Assembly - Location and Detail ** ON A/C NOT FOR ALL

(a) Identify and connect each of the electrical connector (6) and (11) to their related servovalves (7) and (12).
(b) Identify and connect each of the electrical connector (13) and (14) to their related pressure transducers (17) and (18).

Subtask 32-42-16-420-051-G ** ON A/C NOT FOR ALL

NOTE: You must install the manifold assembly (19) on the MLG mounting lugs when the sealant is wet.

(4) Hold the manifold assembly (19) in position on the MLG mounting lugs.
(5) Install the items that follow:

The brackets (8) and (16)
The new AIPC 32-11-11-85-020 TAB WASHERS (9) or AIPC 32-11-85-85-020 TAB WASHERS (9)
The bolts (10).

(6) TORQUE the bolts (10) to between 1.8 and 1.6 m.daN (13.27 and 11.80 lbf.ft )

.
(7) Safety the bolts (10) with the tab washers (9).
(8) Install the electrical harnesses on the brackets (8) and (16) (Ref. AMM TASK 32-11-43-400-002).
(9) Examine the electrical harnesses for correct routing and installation.
(10) Connect the hydraulic unions (1) and (2).
(11) TORQUE the hydraulic unions (1) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(12) TORQUE the hydraulic union (2) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

.
(13) Connect the hydraulic unions (4) and (5) as follows:

Normal-Brake Servovalve-Manifold Assembly - Location and Detail ** ON A/C NOT FOR ALL

NOTE: This will prevent an incorrect connection of the hydraulic lines downstream of the manifold assembly (19).

(d) TORQUE the hydraulic unions (4) and (5) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

Normal-Brake Servovalve-Manifold Assembly - Location and Detail ** ON A/C NOT FOR ALL

Subtask 32-42-16-865-052-A

C. Remove the safety clip(s) and the tag(s) and close 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 32-42-16-870-050-A

D. Preparation for Test
(1) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).
(2) Do the bleeding of the normal brake system (Ref. AMM TASK 32-42-00-870-001).
(3) Make sure that the work area is clean and clear of tools and other items.

Subtask 32-42-16-710-050-A

E. Test
(1) Do an operational test of the normal brake system (Ref. AMM TASK 32-42-00-710-001).
(2) Do an operational test of the anti-skid inhibition (Ref. AMM TASK 32-42-00-710-003).
(3) Make sure that there are no leaks from the normal-brake servovalve-manifold assembly and the hydraulic unions.

Subtask 32-42-16-720-050-A

F. Functional Test
(1) Do a functional test of one of the two tachometers on the MLG on which the normal-brake servovalve-manifold assembly is installed (Ref. AMM TASK 32-42-00-720-002).

5. Close-up
Subtask 32-42-16-942-051-A

A. Removal of Equipment
(1) Remove the SAFETY BARRIER(S).
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).
(4) Remove the ground safety locks from the landing gears (Ref. AMM TASK 32-00-00-081-001).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:47:50 UTC