Functional Test of the Normal Braking System after Removal/Installation of one Normal Servovalve

TASK 32-42-00-720-005-A
Functional Test of the Normal Braking System after Removal/Installation of one Normal 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.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.

WARNING: PRESSURIZE ONLY THE HYDRAULIC SYSTEM(S) THAT IS (ARE) NECESSARY FOR THE TASK. ISOLATE THE OTHER HYDRAULIC SYSTEM(S) BEFORE YOU SUPPLY HYDRAULIC POWER TO THE AIRCRAFT.

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

1. Reason for the Job
To make sure that:

The related Normal servovalve operates correctly after its removal/ installation.

If you replace more than one Normal servovalve at the same time and on a same landing gear, do the functional test of the tachometers (Ref TASK. 32-42-00-720-002) to make sure that no wiring cross connection occurred.
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)

B. 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 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 29-23-00-863-001-A	Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 29-23-00-864-001-A	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
TASK 32-00-00-481-001-A	Installation of the Safety Devices on the Landing Gears
TASK 32-46-00-740-002-A	BITE Test of the BSCU - Ground Scanning
TASK 34-10-00-860-004-A	Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-01	Automatic Inertial Reference (IR) Alignment-Procedure
TASK 34-10-00-860-004-A-02	Inertial Reference (IR) Alignment-Procedure to do a Check of the Links between each Flight Management and Guidance Computer (FMGC) and the three Air Data/Inertial Reference Units (ADIRUs)
TASK 34-10-00-860-005-A	ADIRS Stop Procedure
TASK 32-46-00-00-02	BRAKES AND STEERING - BITE - DESCRIPTION AND OPERATION
Illustration of the BSCU System Data page

3. Job Set-up
Subtask 32-42-00-941-070-A

A. Safety Precautions
(1) Make sure that the wheel chocks are in position.
(2) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(3) Make sure that the ground safety locks are installed on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(4) On the panel 400VU:

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

Subtask 32-42-00-860-098-A

B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Pressurize the Green hydraulic system (Ref. AMM TASK 29-23-00-863-001).
(3) On the panel 402VU, make sure that the A/SKID & N/WS switch is at ON.
(4) Do the IR alignment procedure (Ref. AMM TASK 34-10-00-860-004).
(5) Put the parking brake control-switch in the OFF position.

Subtask 32-42-00-865-073-A

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	L/G/Y BRK/PRESS/IND	61GG	C10
** ON A/C NOT FOR ALL
49VU	ABCU &/Y BRK/PRESS IND	61GG	C10
** 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

4. Procedure
Subtask 32-42-00-480-052-B

A. Preparation for Test

Illustration of the BSCU System Data page

(1) Do the BITE Test of the BSCU (Ground Scanning) (Ref. AMM TASK 32-46-00-740-002).

Make sure that there is no fault message related to the Normal pressure transducers.

(2) On BSCU CHAN/SYS 1(2) page, push the line key adjacent to the SPECIFIC DATA indication.
(3) On BSCU CHAN 1(2)/SPECIFIC DATA page, push the line key adjacent to the SYSTEM DATA page.

Subtask 32-42-00-720-054-B

B. Do this test:

Illustration of the BSCU System Data page

ACTION	RESULT
1.Open the circuit breakers 1GG, 3GG. Then close the circuit breakers 1GG first, then 3GG to make sure that you put the BSCU CHAN 1 in the active mode.
2.On the Captain or First Officer side: Fully push the two brake pedals.
3.On the MCDU, on System data page 1/3 given at step 4.A. (Ref. AMM D/O 32-46-00-00): Push the line key adjacent to the REFRESH indication. Read the hydraulic pressure value of the related Normal pressure transducer (related to the normal servovalve that you replaced).	The hydraulic pressure value of the related Normal pressure transducer (related to the Normal servovalve that you replaced) is equal to 175 -10 bar or +10 bar (2538 -145 psi or +145 psi).
4.Slowly release the two brake pedals.
5.On the MCDU, push the line key adjacent to the REFRESH indication.	The hydraulic pressure value of the related Normal pressure transducer (related to the Normal servovalve that you replaced) is less than 6 bar (87 psi).
6.Open circuit breakers 1GG. Then close it to make sure that you put BSCU CHAN 2 in the active mode.
7.Do again the steps 2 to 5 with BSCU CHAN 2 in the active mode	Same results as for BSCU CHAN 1 in the active mode.

Subtask 32-42-00-860-099-A

C. Aircraft Maintenance Configuration
(1) Put the PARKING BRK control-switch in the ON position.
(2) Depressurize the Green hydraulic system (Ref. AMM TASK 29-23-00-864-001).
(3) Do the ADIRS stop procedure (Ref. AMM TASK 34-10-00-860-005).
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

5. Close-up
Subtask 32-42-00-942-065-A

A. Removal of Equipment
(1) Remove the WARNING NOTICE(S).
(2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(3) Put the aircraft back to the serviceable condition.

[Rev.10 from 2021] 2026.04.01 12:31:55 UTC