Filling and Bleeding of the Low Pressure Control System of the Alternate Braking

TASK 32-43-00-612-001-A
Filling and Bleeding of the Low Pressure Control System of the Alternate Braking

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.

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

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. Reason for the Job
You must do this procedure to fill the system or after you remove equipment from it.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	AR	VALVE - FILLING
No specific	AR	WARNING NOTICE(S)
98A29001001001	1	UNIT FILLING-AIRCRAFT BRAKE SYSTEM

B. Consumable Materials

REFERENCE	DESIGNATION
No specific	lockwire corrosion resistant steel 0.8 (0.03 in) dia

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
811

D. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-10-00-863-002-A	Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-24-00-863-001-A	Pressurize the Yellow Hydraulic System with the Electric Pump
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
Low Pressure Control System of the Alternate Braking with Anti Skid - Filling and Bleeding
Bleed Valves of the Alternate-Braking Distribution Dual-Valve

3. Job Set-up
Subtask 32-43-00-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the panel 400VU, make sure that the landing-gear normal control-lever is set to DOWN.
(2) On the panel 110VU, make sure that the PARK BRK control switch is set to OFF.
(3) Make sure that the Green and the Yellow hydraulic systems are depressurized (Ref. AMM TASK 29-00-00-864-001).

Subtask 32-43-00-941-052-A ** ON A/C NOT FOR ALL

B. Safety Precaution
(1) Put the WARNING NOTICE(S) in position to tell persons not to operate:

the landing-gear normal control-lever,
the PARK BRK control switch,
the brake pedals,
and not to pressurize the Green and the Yellow hydraulic systems.

Subtask 32-43-00-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the main doors of the main gear (Ref. AMM TASK 32-12-00-010-001).
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE below the access door 811.
(3) Open the access door 811.

Subtask 32-43-00-480-050-A ** ON A/C NOT FOR ALL

CAUTION: BEFORE YOU START THE FILLING/BLEEDING PROCEDURE, WAIT FOUR HOURS. THIS IS NECESSARY TO MAKE SURE THAT THERE IS NO AIR IN THE HYDRAULIC FLUID OF THE RESERVOIR FILLING UNIT.

D. Preparation for Replenishment

Low Pressure Control System of the Alternate Braking with Anti Skid - Filling and Bleeding ** ON A/C NOT FOR ALL

Bleed Valves of the Alternate-Braking Distribution Dual-Valve ** ON A/C NOT FOR ALL

(1) On the reservoir 2624GM:
(a) Disconnect the drain hose (aircraft system) from the bleed valve.
(b) Connect a transparent hose on the bleed valve to collect the hydraulic and monitor the presence of air bubbles during the filling operation.
(c) Put the other end of the hose into a CONTAINER 5 L (1.32 USGAL).
(d) Cut, remove and discard the lockwire, then open the bleed valve.
(2) On the alternate-brake distribution dual-valve (2577GM):
(a) Remove the plugs (2) and (3) of the bleed valves (unions J and K).
(b) Remove and discard the lockwire.
(c) Release the screws (1) and (4) approximately 5 turns to open the bleed valves on the unions J and K.
(3) Install a VALVE - FILLING on each of the bleed valves.
(4) Connect the 98A29001001001 UNIT FILLING-AIRCRAFT BRAKE SYSTEM to the filling valves installed on the bleed valves of the alternate-brake distribution dual-valve (2577GM).

NOTE: Fill all the lines of the filling unit. Make sure that there are no air bubbles in the connection.

4. Procedure
Subtask 32-43-00-611-051-A ** ON A/C NOT FOR ALL

A. Bleeding and Replenishment of the Alternate Brake Control Reservoir
(1) Depressurize the brake Yellow-pressure accumulator 2582GM (Ref. AMM TASK 29-10-00-864-002).
(2) Open the VALVE - FILLING on the bleed valves (unions J and K) of the alternate-brake distribution dual-valve (2577GM). Fill until the fluid flows with no air bubbles from the bleed valve of reservoir 2624GM. The supply pressure must not be more than 4 bar (58.0151 psi).
(3) Close the VALVE - FILLING on the left bleed valve (union J). Use the VALVE - FILLING on the right bleed valve (union K) to continue the filling operation. Monitor the fluid flow.
When the fluid flows with no air bubbles, open the VALVE - FILLING on the left bleed valve (union J).
(4) Close the VALVE - FILLING on the right bleed valve (union K). Use the VALVE - FILLING on the left bleed valve (union J) to continue the filling operation. Monitor the fluid flow.
When the fluid flows with no air bubbles, close the VALVE - FILLING on the left bleed valve (union J).
(5) At this step the reservoir 2624GM is full (the reservoir piston is on its stop). Let the fluid flow through the bleed valve on the reservoir 2624GM. Close the bleed valve when the piston end is aligned with the green band (normal level).
(6) Close the bleed valves (unions J and K) of the alternate-brake distribution dual-valve (2577GM).

Subtask 32-43-00-863-054-A ** ON A/C NOT FOR ALL

B. Test
(1) Pressurize the Yellow Hydraulic system (Ref. AMM TASK 29-10-00-863-002) or (Ref. AMM TASK 29-24-00-863-001).
(2) Do this test:

ACTION	RESULT
1.Push the left pedal on the Captain or First Officer side.	Make sure that : All the pistons are retracted on the brake units of the right main gear. The pistons related to the Yellow hydraulic system on the brake units of the left main gear extend slowly. On the panel 400VU : Make sure that the brake Yellow pressure triple indicator 60GG shows pressure value on LH side.
2.Slowly release the left pedal.	Make sure that the pistons slowly retract on the two brakes of the left main gear.
3.Push the right pedal on the Captain or First Officer side.	Make sure that : All the pistons are retracted on the brake units of the left main gear The pistons related to the Yellow hydraulic system on the brake units of the right main gear extend slowly. On the panel 400VU : Make sure that the brake Yellow pressure triple indicator 60GG shows pressure value on RH side.
4.Slowly release the right pedal.	Make sure that the pistons slowly retract on the two brakes of the right main gear.

5. Close-up
Subtask 32-43-00-860-061-A ** ON A/C NOT FOR ALL

A. Put the system in normal configuration
(1) Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-864-002).
(2) Disconnect the supply lines from the alternate-brake distribution dual-valves (2577GM).
(3) Safety the bleed valves with lockwire corrosion resistant steel 0.8 (0.03 in) dia.
(4) Install the plugs (2) and (3) on the bleed valves.
(5) Disconnect the transparent hose from the reservoir 2624GM and connect the drain hose (aircraft system) on the bleed valve.

Subtask 32-43-00-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Close the access door 811.
(2) Close the main doors of the main gears (Ref. AMM TASK 32-12-00-410-001).

Subtask 32-43-00-942-052-A ** ON A/C NOT FOR ALL

C. Removal of Equipment
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).
(3) Make sure that the work area is clean and clear of tools and other items.

[Rev.10 from 2021] 2026.04.01 00:48:34 UTC