Installation of the Park Brake - Pressure Switch

TASK 32-45-17-400-001-A
Installation of the Park Brake - Pressure Switch

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: 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.

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

FIN: 86GG ** 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 2 L (0.53 USGAL)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 7.95 and 7.85 m.daN (58.63 and 57.89 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
11	PACKING	AIPC 32-45-03-03-340

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
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 29-23-00-860-002-A	Connection 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 32-12-00-410-001-A	Close the Main Gear Doors after Access
TASK 32-43-00-710-001-A	Operational Check of Alternate Braking System
TASK 32-43-00-870-002-A	Bleeding of the High Pressure Alternate Braking System
TASK 32-45-00-710-001-A	Operational Check of the Parking Brake System
TASK 51-75-13-916-002-A	Repair to a layer of Corrosion Preventive Compound
Park Brake-Pressure Switch

3. Job Set-up
Subtask 32-45-17-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the PTU isolation coupling is disconnected (Ref. AMM TASK 29-23-00-860-001).
(3) Make sure that the Yellow hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-002).
(4) Make sure that the reservoir of the Yellow hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).
(5) Make sure that the right MLG door is open (Ref. AMM TASK 32-12-00-010-001).
(6) Make sure that the CONTAINER 2 L (0.53 USGAL) is in position below the pressure switch (4).
(7) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position.

Subtask 32-45-17-865-051-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	L/G/Y BRK/PRESS/IND	61GG	C10
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
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 32-45-17-941-051-A ** ON A/C NOT FOR ALL

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

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

4. Procedure
Subtask 32-45-17-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Park Brake-Pressure Switch 86GG
(1) Remove the PLUG-BLANKING from each disconnected line end.
(2) Make sure that the hydraulic line end-fittings are serviceable.
(3) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(4) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the new packing (11) and to the threads of the park brake-pressure switch (4).
(5) Install the new AIPC 32-45-03-03-340 PACKING (11) on the park brake-pressure switch (4).
(6) Install the park brake-pressure switch (4) in the union (1).
(7) TORQUE the park brake-pressure switch (4) to between 7.95 and 7.85 m.daN (58.63 and 57.89 lbf.ft )

.
(8) Put the bonding strap (8) in position on the clamp (9) and install the:

washer (7), bolt (6), washer (3) and the nut (2) (Ref. AMM TASK 20-28-00-912-802).

(9) Remove the CAP-BLANKING from each electrical connector and receptacle.
(10) Make sure that all the electrical connections are clean and in the correct condition.

CAUTION: MAKE SURE THAT THE BONDING STRAP(S) IS(ARE) CONNECTED BEFORE YOU CONNECT THE ELECTRICAL CONNECTOR(S).

(11) Install the electrical connector (5).

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.

(12) Safety the park brake-pressure switch (4) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy - (10).

Subtask 32-45-17-860-052-A ** ON A/C NOT FOR ALL

B. Preparation for Test
(1) Remove the WARNING NOTICE(S).
(2) Connect the PTU isolation coupling (Ref. AMM TASK 29-23-00-860-002).

Subtask 32-45-17-865-052-A ** ON A/C NOT FOR ALL

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
49VU	L/G/Y BRK/PRESS/IND	61GG	C10
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
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 32-45-17-870-050-A ** ON A/C NOT FOR ALL

D. Bleeding of the Braking System
(1) Bleed the high-pressure alternate braking system (Ref. AMM TASK 32-43-00-870-002).

Subtask 32-45-17-710-050-A ** ON A/C NOT FOR ALL

E. Test
(1) Do the operational check of the parking brake system (Ref. AMM TASK 32-45-00-710-001).
(2) Do the operational check of the alternate braking with anti skid (Ref. AMM TASK 32-43-00-710-001).
(3) Make sure that there is no hydraulic fluid leakage from the dual shuttle valve 2578GM and the pressure switch (1).

5. Close-up
Subtask 32-45-17-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Apply corrosion protection to the heads of the bolts, the connectors and the adjacent areas of the pressure switch (Ref. AMM TASK 51-75-13-916-002).
(2) Remove the CONTAINER.
(3) Remove the access platform(s).
(4) Make sure that the work area is clean and clear of tools and other items.
(5) Close the right MLG door (Ref. AMM TASK 32-12-00-410-001).
(6) If necessary fill the reservoir of the Yellow hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001).
(7) De-energize the ground service network (Ref. AMM TASK 24-42-00-862-001).
(8) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 12:32:19 UTC