Installation of the Brake Hydraulic Self-Sealing Coupling

TASK 32-42-27-400-004-A
Installation of the Brake Hydraulic Self-Sealing Coupling

WARNING: LET THE BRAKES AND THE WHEELS BECOME COOL BEFORE YOU GO NEAR THE LANDING GEAR. DO NOT APPLY A LIQUID OR GAS DIRECTLY ON A HOT WHEEL OR BRAKE UNIT. THIS CAN CAUSE A TIRE EXPLOSION AND/OR A WHEEL RIM BURST.

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

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	COVER - PROTECTION
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 16.5 and 13.5 lbf.ft (2.24 and 1.83 m.daN )
No specific	Torque wrench: range to between 1.98 and 1.62 m.daN (14.60 and 11.95 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	PREFORMED PACKING	AIPC 32-42-27-01-100
3	PREFORMED PACKING	AIPC 32-42-27-01-131
3	PREFORMED PACKING	AIPC 32-42-27-03-060
3	PREFORMED PACKING	AIPC 32-42-27-03-110
3	PREFORMED PACKING	AIPC 32-42-27-03-131

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 32-42-00-870-001-A	Bleeding of the Normal Braking at the Brake Units
TASK 32-43-00-870-002-A	Bleeding of the High Pressure Alternate Braking System
Brake Hydraulic-Self Sealing Coupling

3. Job Set-up
Subtask 32-42-27-941-071-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that the SAFETY BARRIER(S) are in position.
(2) Make sure that the WARNING NOTICE(S) is (are) in position:

on the ground service panel to tell persons not to pressurize the Green and Yellow hydraulic systems,
on the panel 40VU, to tell persons not to pressurize the Green and Yellow hydraulic systems.

Subtask 32-42-27-860-074-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the wheel chocks are in position.
(2) On the panel 110VU, make sure that the PARK BRK control switch is set to OFF.
(3) Make sure that there is a WARNING NOTICE(S) to tell persons not to operate the brake pedals.
(4) On the panel 110VU, make sure that there is a WARNING NOTICE(S) on the PARK BRK control switch (73GG) to tell persons not to operate the parking brake system.
(5) Make sure that the Green and Yellow hydraulic systems are depressurized (Ref. AMM TASK 29-00-00-864-001).

Subtask 32-42-27-865-066-A ** ON A/C NOT FOR ALL

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/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/PARK BRK/CTL/STBY	71GG	N37
121VU	HYDRAULIC/PARK BRK/CTL/NORM	70GG	N36

4. Procedure
Subtask 32-42-27-420-056-A ** ON A/C NOT FOR ALL

A. Installation of the Brake Hydraulic Self-Sealing Coupling
(1) Remove the PLUG - BLANKING from the related inlet port of the hydraulic crown (4).
(2) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the related brake hydraulic self-sealing coupling (2) and on the new preformed packing (3).
(3) Install the new AIPC 32-42-27-01-131 PREFORMED PACKING (3) or AIPC 32-42-27-01-100 PREFORMED PACKING (3) or AIPC 32-42-27-03-110 PREFORMED PACKING (3) on the related brake hydraulic self-sealing coupling (2).
(4) Install the brake hydraulic self-sealing coupling (2) on the related inlet port of the brake hydraulic crown (4).
(5) TORQUE the brake hydraulic self-sealing coupling (2) to between 1.98 and 1.62 m.daN (14.60 and 11.95 lbf.ft )

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.

(6) Safety the brake hydraulic self-sealing coupling (2) to the brake hydraulic crown with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(7) Remove the COVER - PROTECTION from the hydraulic line quick-disconnect (1).
(8) Connect the related hydraulic line quick-disconnect (1) to the brake hydraulic self-sealing coupling (2).

Subtask 32-42-27-420-056-B ** ON A/C NOT FOR ALL

A. Installation of the Brake Hydraulic Self-Sealing Coupling
(1) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the related brake hydraulic self-sealing coupling (2) and on the new preformed packing (3).
(2) Install the new AIPC 32-42-27-01-131 PREFORMED PACKING (3) or AIPC 32-42-27-01-100 PREFORMED PACKING (3) on the related brake hydraulic self-sealing coupling (2).
(3) Install the brake hydraulic self-sealing coupling (2) on the related inlet port of the brake hydraulic crown (4).
(4) TORQUE the brake hydraulic self-sealing coupling (2) to between 16.5 and 13.5 lbf.ft (2.24 and 1.83 m.daN )

.
(5) Safety the brake hydraulic self-sealing coupling (2) to the brake hydraulic crown with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(6) Connect the related hydraulic line quick-disconnect (1) to the brake hydraulic self-sealing coupling (2).

Subtask 32-42-27-420-056-E ** ON A/C NOT FOR ALL

A. Installation of the Brake Hydraulic Self-Sealing Coupling
(1) Remove the PLUG - BLANKING from the related inlet port of the hydraulic crown (4).
(2) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the related brake hydraulic self-sealing coupling (2) and on the new preformed packing (3).
(3) Install the new AIPC 32-42-27-03-060 PREFORMED PACKING (3) or AIPC 32-42-27-03-131 PREFORMED PACKING (3) or AIPC 32-42-27-03-110 PREFORMED PACKING (3) on the related brake hydraulic self-sealing coupling (2).
(4) Install the brake hydraulic self-sealing coupling (2) on the related inlet port of the brake hydraulic crown (4).
(5) TORQUE the brake hydraulic self-sealing coupling (2) to between 1.98 and 1.62 m.daN (14.60 and 11.95 lbf.ft )

Subtask 32-42-27-870-052-A ** ON A/C NOT FOR ALL

B. Bleed the Brake Unit:

CAUTION: THE BLEEDING PROCEDURE OF THE BRAKE UNIT CALLS FOR OPERATIONAL TEST OF THE NORMAL AND ALTERNATE BRAKING SYSTEM. DURING THESE TESTS CHECK HYDRAULIC CONNECTIONS AND BRAKE UNIT FOR LEAKAGE.

(1) Do the procedure(s) (Ref. AMM TASK 32-42-00-870-001) and/or (Ref. AMM TASK 32-43-00-870-002).

Subtask 32-42-27-865-067-A ** ON A/C NOT FOR ALL

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

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/PARK BRK/CTL/STBY	71GG	N37
121VU	HYDRAULIC/PARK BRK/CTL/NORM	70GG	N36

Subtask 32-42-27-710-052-A ** ON A/C NOT FOR ALL

D. Test
(1) You did the operational tests of the Normal and Alternate braking systems after removal/installation of the brake hydraulic self-sealing couplings at the end of the bleeding procedures.
No other tests are necessary.

5. Close-up
Subtask 32-42-27-942-061-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 12:31:53 UTC