Installation of the Brake

TASK 32-42-27-400-001-A
Installation of the Brake

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: 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.

ZONE: 731
ZONE: 741
FIN: 2641GM
FIN: 2642GM
FIN: 2643GM
FIN: 2644GM

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	CRANE 100KG (220 LB)
No specific	1	EXTENSION
No specific	AR	SAFETY BARRIER(S)
No specific	1	SOCKET STANDARD
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 22 and 20 m.daN (162.24 and 147.49 lbf.ft )
No specific	Torque wrench: range to between 24 and 22 m.daN (176.99 and 162.24 lbf.ft )
1324A	1	HANDLING TOOL
98D32403005001	1	ADAPTOR - BRAKE UNIT NUT
98D32403006200	1	CONE-PROTECTIVE
98D32403007200	1	PROTECTOR, WHEEL AXLE
F27220000	1	HOISTING DEVICE
F46754-1000	1	PROTECTOR
J47779	1	PROTECTIVE CONE
M46292	1	ADAPTOR
Q47323-1	1	GUIDE CONE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03LBB1)	Grease-Thread Anti-seize Graphited and Petrolatum -
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
731	L.H MAIN GEAR
741	R.H MAIN GEAR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-21-11-911-001-A	Tightening Torques for Standard Threaded Fasteners
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 32-00-00-081-001-A	Removal of the Safety Devices from the Landing Gears
TASK 32-11-12-000-001-A	Removal of the MLG Hydraulic Dressings
TASK 32-11-12-400-001-A	Installation of the MLG Hydraulic Dressings
TASK 32-11-12-960-801-A	Replacement of the Quick-Release Coupling
TASK 32-41-11-400-006-A	Installation of the MLG Wheel
TASK 32-42-00-870-001-A	Bleeding of the Normal Braking at the Brake Units
TASK 32-42-27-000-001-A	Removal of the Brake
TASK 32-42-27-000-004-A	Removal of the Brake Hydraulic Self-Sealing Coupling
TASK 32-42-27-210-003-A	Functional Check of Brake Heat Pack for Wear by Use of the Wear Indicator (Parking Brake Applied)
TASK 32-42-27-400-001-A	Installation of the Brake
TASK 32-42-27-400-004-A	Installation of the Brake Hydraulic Self-Sealing Coupling
TASK 32-43-00-870-002-A	Bleeding of the High Pressure Alternate Braking System
TASK 32-47-00-710-001-A	Operational Test of the Brake Temperature System
TASK 32-47-15-400-001-A	Installation of the Brake Temperature Sensor
ESPM 205550
Brake Unit ** ON A/C NOT FOR ALL
Brake Unit ** ON A/C NOT FOR ALL
Brake Unit ** ON A/C NOT FOR ALL
Brake Unit ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 32-42-27-941-061-A

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 32-42-27-860-060-A

B. Aircraft Maintenance Configuration
(1) Make sure that the wheel chocks are in position for the wheels that are on the ground.
(2) Make sure that the Green and Yellow hydraulic systems are depressurized (Ref. AMM TASK 29-00-00-864-001).
(3) On the panel 110VU, make sure that the PARK BRK control switch is set to OFF.
(4) Make sure that the tool that you installed during the removal of the brake is in position:

J47779 PROTECTIVE CONE, or
F46754-1000 PROTECTOR, or
98D32403006200 CONE-PROTECTIVE, or
Q47323-1 GUIDE CONE, or
98D32403007200 PROTECTOR, WHEEL AXLE.

Subtask 32-42-27-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRK/TEMP/DET/UNIT	1GW	M37
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 32-42-27-640-050-A

A. Preparation for Installation
(1) Clean the axle protective sleeve (5) and the studs (11) with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .
(2) Do a visual inspection of the axle protective sleeve (5) to make sure that it is in the correct condition.
(3) Lightly lubricate the studs (11), bolts (12) and nuts (8) with Grease-Thread Anti-seize Graphited and Petrolatum - (Material No.03LBB1) .
(4) If you removed the brake unit but you did not send it to the overhaul facility, do the steps that follow:
(a) Do a test of the locking function of the nuts (8) and the bolts (12):
1 Tighten the nuts (8) with your hand:
a If the shanks of the bolts (12) are flush with the ends of the nuts (8), or come out of the nuts (8):

Replace the nuts (8) and tighten them with your hand.

(b) If you replaced the nuts (8) in step (a):
1 Do the test of the locking function of the nuts (8) and the bolts (12) again:
a If the shanks of the bolts (12) are flush with the ends of the nuts (8), or come out of the nuts (8):

Send the brake unit with all the nuts (8), bolts (12) and washers (7) to the overhaul facility for inspection, refer to the manufacturer CMM.

(5) If necessary, install the brake temperature sensor retained at removal of the brake unit (Ref. AMM TASK 32-47-15-400-001).

Subtask 32-42-27-420-054-A ** ON A/C NOT FOR ALL

B. Installation of the Brake
(1) Before you install the brake unit, examine the brake flange bushings to make sure that they are correctly attached.
(2) Install the brake unit (1) on the wheel axle (6) with the CRANE 100KG (220 LB) and the F27220000 HOISTING DEVICE or 1324A HANDLING TOOL.
(3) Install the washers (7) and nuts (8) on the bolts (12).
(4) Make sure that the studs (11) are in the correct position in the axle (6).
(5) TORQUE the nuts (8):
(a) Calculate the torque wrench setting for the adaptor you will use, to get a torque value to between 22 and 20 m.daN (162.24 and 147.49 lbf.ft )

at the nut (Ref. AMM TASK 20-21-11-911-001). Use a M46292 ADAPTOR or a 98D32403005001 ADAPTOR - BRAKE UNIT NUT or a SOCKET STANDARD with an EXTENSION.
(b) TORQUE the nuts (8) to between 22 and 20 m.daN (162.24 and 147.49 lbf.ft )

NOTE: The specified torque value is the torque that you must apply to the nut and not the torque wrench setting.

(6) Remove the J47779 PROTECTIVE CONE from the wheel axle.
(7) Make sure that the retaining ring (4) of the axle protective sleeve (5) is in the correct position.

Subtask 32-42-27-420-054-F ** ON A/C NOT FOR ALL

B. Installation of the Brake
(1) Before you install the brake unit, examine the brake flange bushings to make sure that they are correctly attached.
(2) Install the brake unit (1) on the wheel axle (6) with the CRANE 100KG (220 LB) and the 1324A HANDLING TOOL.
(3) Install the washers (7) and nuts (8) on the bolts (12).
(4) Make sure that the studs (11) are in the correct position in the axle (6).
(5) TORQUE the nuts (8):
(a) Calculate the torque wrench setting for the adaptor you will use, to get a torque value to between 24 and 22 m.daN (176.99 and 162.24 lbf.ft )

NOTE: The specified torque value is the torque that you must apply to the nut and not the torque wrench setting.

(6) Remove the Q47323-1 GUIDE CONE or the 98D32403007200 PROTECTOR, WHEEL AXLE from the wheel axle.
(7) Make sure that the retaining ring (4) of the axle protective sleeve (5) is in the correct position.

Subtask 32-42-27-420-057-A

C. Connection of the Hydraulic Quick-Release Couplings
(1) Remove the blanking plugs from the hydraulic quick-release couplings (2) and (14) and from the brake-unit self-sealing couplings (3) and (13).
(2) Connect the hydraulic quick-release couplings as follows:
(a) Make sure that the lockwires installed between the hydraulic quick-release couplings (2) and (14) and their brake hoses are in the correct condition.
(b) If the lockwire(s) is (are) loose or broken:

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 Cut, remove and discard the lockwire(s).
2 Remove the hydraulic quick-release couplings (2) and (14) from their brake hoses.
3 Do a visual inspection of the hydraulic quick-release couplings (2) and (14) and the mating surfaces of the brake hoses for damage:

If there is no damage, install the brake hose(s) again on the hydraulic quick-release coupling(s) (2) and/or (14) and torque the hydraulic quick-release coupling(s) (2) and/or (14) (Ref. AMM TASK 32-11-12-960-801).
If there is damage on the hydraulic quick-release coupling(s) (2) and/or (14) and/or on the brake hose(s), replace the two parts.

Replace the hydraulic quick-release coupling(s) (2) and/or (14) (Ref. AMM TASK 32-11-12-960-801).
(c) Connect the hydraulic quick-release couplings (2) and (14) to the brake-unit self-sealing couplings (3) and (13).

Subtask 32-42-27-420-055-C

D. End of the installation
(1) Remove the blanking caps from the electrical connector (9) and the receptacle (10).
(2) Clean the electrical connector (9) and the receptacle (10) ESPM 205550.
(3) Connect the electrical connector (9) to the receptacle (10) and fold back the end of the sleeve (15) on the connector (9) to cover it fully.

Subtask 32-42-27-870-050-A

E. 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 bleeding procedure of the normal braking at the brake units (Ref. AMM TASK 32-42-00-870-001).
(2) Do the bleeding procedure of the high-pressure alternate braking-system (Ref. AMM TASK 32-43-00-870-002).
(3) During the bleeding procedure of the normal and alternate braking systems, do a leak check of the hydraulic quick-release couplings (2) and (14) and the brake-unit self-sealing couplings (3) and (13).
If you find leaks on the hydraulic connection(s) and/or on the brake unit(s) (1), go to Para. 4.F.

Subtask 32-42-27-790-050-A ** ON A/C NOT FOR ALL

F. Leak Repair
(1) If you find leaks between the hydraulic quick-release coupling(s) (2) and/or (14) and the union(s) of the brake hose(s):
(a) Release the brake pressure and depressurize the brake hydraulic system (Ref. AMM TASK 29-00-00-864-001).
(b) Remove the lockwire(s):

1 Cut, remove and discard the lockwire(s) between the hydraulic quick-release coupling(s) (2) and/or (14) and the union(s) of the brake hose(s).
(c) Disconnect the union(s) of the brake hose(s) from the hydraulic quick-release coupling(s) (2) and/or (14).
Do a visual inspection of these two parts for signs of wear or damage on the internal mating surfaces.

CAUTION: HOLD THE QUICK-RELEASE COUPLING WHEN YOU TORQUE THE HOSE ASSEMBLY AND MAKE SURE IT DOES NOT TURN. DAMAGE TO THE QUICK-RELEASE COUPLING CAN OCCUR IF IT TURNS.

1 If there is damage on the hydraulic quick-release coupling(s) (2) and/or (14) and/or on the brake hose(s), replace the two parts:

Replace the hydraulic quick-release coupling(s) (2) and/or (14) (Ref. AMM TASK 32-11-12-960-801).
Replace the applicable brake hose(s) (Ref. AMM TASK 32-11-12-000-001) and (Ref. AMM TASK 32-11-12-400-001).

CAUTION: HOLD THE QUICK-RELEASE COUPLING WHEN YOU TORQUE THE HOSE ASSEMBLY AND MAKE SURE IT DOES NOT TURN. DAMAGE TO THE QUICK-RELEASE COUPLING CAN OCCUR IF IT TURNS.

2 If there is no damage, make sure that the two parts are clean and install the brake hose(s) again on the hydraulic quick-release coupling(s) (2) and/or (14).

TORQUE the hydraulic quick-release coupling(s) (2) and/or (14) to the union(s) of the brake hose(s) in accordance with (Ref. AMM TASK 32-11-12-960-801).
Safety the union(s) of the brake hose(s) to the hydraulic quick-release coupling(s) (2) and/or (14) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.

(d) Do the bleeding procedure of the normal braking at the brake units (Ref. AMM TASK 32-42-00-870-001).
(e) Do the bleeding procedure of the high-pressure alternate braking-system (Ref. AMM TASK 32-43-00-870-002).
(2) If you find leaks between the brake-unit self-sealing coupling(s) (3) and/or (13) and the brake unit(s) (1):
(a) Release the brake pressure and depressurize the brake hydraulic system (Ref. AMM TASK 29-00-00-864-001).
(b) Disconnect the hydraulic quick-release coupling(s) (2) and/or (14).

CAUTION: TO REMOVE THE HYDRAULIC QUICK-RELEASE COUPLING FROM THE BRAKE UNIT, TURN THE LOCKING COLLAR BEFORE YOU PULL IT AWAY. IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.

1 Disconnect the hydraulic quick-release coupling(s) (2) and/or (14) from the brake-unit self-sealing coupling(s) (3) and/or (13).
(c) Remove the lockwire(s):

1 Cut, remove and discard the lockwire(s) from the brake-unit self-sealing coupling(s) (3) and/or (13).
(d) Remove the brake-unit self-sealing coupling(s) (3) and/or (13) from the brake unit(s) (1) (Ref. AMM TASK 32-42-27-000-004)
Do a visual inspection of these two parts for signs of wear or damage on the internal mating surfaces.
1 If there is damage on the brake-unit self-sealing coupling(s) (3) and/or (13) and/or on the brake unit (1), replace the two parts:

2 If there is no damage, make sure that the two parts are clean and install the brake-unit self-sealing coupling(s) (3) and/or (13) again (Ref. AMM TASK 32-42-27-400-004).
(e) Install the hydraulic quick-release coupling(s) (2) and/or (14) on the brake-unit self-sealing coupling(s) (3) and/or (13).

Subtask 32-42-27-790-050-B ** ON A/C NOT FOR ALL

CAUTION: HOLD THE QUICK-RELEASE COUPLING WHEN YOU TORQUE THE HOSE ASSEMBLY AND MAKE SURE IT DOES NOT TURN. DAMAGE TO THE QUICK-RELEASE COUPLING CAN OCCUR IF IT TURNS.

1 If there is damage on the hydraulic quick-release coupling(s) (2) and/or (14) and/or on the brake hose(s), replace the two parts:

Replace the hydraulic quick-release coupling(s) (2) and/or (14) (Ref. AMM TASK 32-11-12-960-801).
Replace the applicable brake hose(s) (Ref. AMM TASK 32-11-12-000-001) and (Ref. AMM TASK 32-11-12-400-001).

CAUTION: HOLD THE QUICK-RELEASE COUPLING WHEN YOU TORQUE THE HOSE ASSEMBLY AND MAKE SURE IT DOES NOT TURN. DAMAGE TO THE QUICK-RELEASE COUPLING CAN OCCUR IF IT TURNS.

2 If there is no damage, make sure that the two parts are clean and install the brake hose(s) again on the hydraulic quick-release coupling(s) (2) and/or (14).

TORQUE the hydraulic quick-release coupling(s) (2) and/or (14) to the union(s) of the brake hose(s) in accordance with (Ref. AMM TASK 32-11-12-960-801).
Safety the union(s) of the brake hose(s) to the hydraulic quick-release coupling(s) (2) and/or (14) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.

1 Disconnect the hydraulic quick-release coupling(s) (2) and/or (14) from the brake-unit self-sealing coupling(s) (3) and/or (13).
(c) Replace the brake unit(s) (Ref. AMM TASK 32-42-27-000-001) and (Ref. AMM TASK 32-42-27-400-001).

Subtask 32-42-27-865-052-A

G. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/BRK/TEMP/DET/UNIT	1GW	M37
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 32-42-27-420-059-A

H. Install the wheel (Ref. AMM TASK 32-41-11-400-006).

Subtask 32-42-27-710-050-A

I. Test
(1) As the operational tests of the Normal and Alternate braking system necessary after removal/installation of the brake unit are already done in the bleeding procedure, do only an operational test of the brake temperature system (Ref. AMM TASK 32-47-00-710-001).
(2) Make sure that the wear indicators are in the correct condition (Ref. AMM TASK 32-42-27-210-003).

5. Close-up
Subtask 32-42-27-942-050-A

A. Put the aircraft back to its initial configuration.
(1) On the parking brake panel 110VU, set the PARK BRAKE control switch to ON.
(2) Remove the safety devices from the landing gears (Ref. AMM TASK 32-00-00-081-001).
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Remove the WARNING NOTICE(S).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 00:47:59 UTC