Removal of the Dual-Valve Alternate Brake-Distribution

TASK 32-43-14-000-001-A
Removal of the Dual-Valve Alternate Brake-Distribution

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: OBEY THE HYDRAULIC SAFETY PROCEDURES. WORK ON THE HYDRAULIC SYSTEMS CAN BE DANGEROUS.

FIN: 2577GM ** ON A/C NOT FOR ALL

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 2M (6 FT)
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	1	HOSE - BLEED
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
811

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-910-002-A	Safety Procedures of the 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 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-44-11-200-001-A	Functional Check of Parking/Emergency Brake Accumulator by Reading the Charge Pressure on the Accumulator Gauge
Hydraulic Reservoir 2624GM
Dual-Valve 2577GM Alternate Brake-Distribution

3. Job Set-up
Subtask 32-43-14-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(2) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(3) Push the pressure release button on the pressure relief valve 3067GM to depressurize the alternate brake system.
(4) Disconnect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-001).
(5) Make sure that the pressure on the gage 2585GM decreases to the fill pressure of the accumulator 2582GM (Ref. AMM TASK 32-44-11-200-001).

Subtask 32-43-14-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the right MLG door (Ref. AMM TASK 32-12-00-010-001).
(2) Put an ACCESS PLATFORM 2M (6 FT) in position at the access door 811.
(3) Open the access door 811.

Subtask 32-43-14-941-050-A ** ON A/C NOT FOR ALL

C. Safety Precautions
(1) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:

On the panel 40VU in the cockpit
On the ground service panel of the Yellow hydraulic system.

Subtask 32-43-14-865-050-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR 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
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
121VU	HYDRAULIC/Y HYD/PUMP ENG2/MONG	3700GD	Q37
121VU	HYDRAULIC/Y HYD/PUMP ENG2/CTL	3701GD	Q36
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 32-43-14-680-050-A ** ON A/C NOT FOR ALL

E. Drain the Alternate Brake Reservoir (2624GM)

Hydraulic Reservoir 2624GM ** ON A/C NOT FOR ALL

(1) Put a CONTAINER 5 L (1.32 USGAL) near the alternate brake reservoir (2624GM).
(2) Remove the plug (33) and the packing (32) from the valve (31).
(3) Turn the knob fully counterclockwise to make sure that the striker is fully rearward. Install the FILLER ADAPTOR TMHDI43-32-00 or equivalent on the valve (31).
(4) Connect a HOSE - BLEED on the filler adaptor and put the other end in the container.
(5) Use the knob on the filler adaptor to move the striker forward to bleed the alternate brake reservoir (2624GM).

NOTE: You must do this operation with a smooth movement to prevent damage to the valve mechanism.

(6) When the alternate brake reservoir is bled, turn the knob fully counterclockwise to move the striker rearward.
(7) Remove the bleed hose, the filler adaptor and the container.
(8) Make sure that the parts retained from the removed component are clean and in the correct condition.
(9) Install the packing (32) and the plug (33) on the valve (31).

4. Procedure
Subtask 32-43-14-020-051-B ** ON A/C NOT FOR ALL

A. Removal of the Dual-Valve (2577GM)
(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Put the ACCESS PLATFORM 2M (6 FT) in position in the opening of the landing gear door.
(3) Put the CONTAINER 5 L (1.32 USGAL) below the dual valve (25) to collect the hydraulic fluid leakage.
(4) Disconnect the elbow assemblies (1) from the dual valve (25).
(5) Disconnect the elbow assembly (26) from the union (9).
(6) Disconnect the hydraulic pipe (4) from the union (3).
(7) Disconnect the hydraulic pipe (7) from the union (6).
(8) Disconnect the hydraulic pipes (10) from the unions (9).
(9) Disconnect the drain hose (15) as follows:
(a) Remove the nut (11), the washer (12), the bolt (17) and the clamps (16).
(b) Remove the nut (18), the washer (19), the clamp (20), the spacer (21) and the bolt (22).
(c) If necessary remove the clamp (14) and the plug (13).
(10) Remove the bolts (23) and the washers (24) and carefully remove the dual valve (25) from the aircraft.
(11) Put the PLUG-BLANKING in each disconnected line end.
(12) If necessary:
(a) Remove and retain the unions (3) and (6) from the removed dual valve (25).
(b) Remove and discard the packings (2) and (5).
(c) Remove and retain the unions (9) from the removed dual valve (25).
(d) Remove and discard the packings (8).
(e) Put blanking plugs on the removed dual valve (25).

[Rev.10 from 2021] 2026.04.01 00:48:50 UTC