Brake Emergency Application or Overheat

TASK 05-50-00-810-825-A
Brake Emergency Application or Overheat

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 32-42-00-810-925-A	Trapped pressure in a brake on NORM or ALTN braking system, or brake dragging
AMM 05-51-16-200-001	Inspection After Brake Emergency Application or Overheat
AMM 10-11-00-555-015	Procedure for the Installation of Wheel Chocks on Aircraft
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 32-42-00-720-002	Functional Test of the Tachometers and the Anti-Skid System with the Normal Braking System ON
ASM 324202
AMM 32-42-57-000-001	Removal of the Tachometer
AMM 32-42-57-400-001	Installation of the Tachometer

3. Fault Confirmation
Subtask 05-50-00-710-074-A

A. Not Applicable

4. Fault Isolation
Subtask 05-50-00-810-080-A

A. After a Brake Emergency Application or Overheat

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.

CAUTION: DURING THE FUNCTIONAL TEST OF THE TACHOMETERS, MAKE SURE THAT THE OPERATION OF THE BRAKE PISTONS IS CORRECT AND AGREES WITH EACH STEP GIVEN IN THIS TEST: INCORRECT OPERATION OF THE BRAKE PISTONS CAN BE CAUSED BY A BAD OR A CROSSED CONNECTION OF THE TACHOMETERS DURING INSTALLATION, AND CAN CAUSE UNSATISFACTORY BRAKING AND/OR A TIRE BURST DURING AIRCRAFT OPERATION.

(1) On the POST FLIGHT REPORT, do a check for a message related to the braking system.
If there is a message, do the trouble shooting procedure related to the message.
(2) Do the inspection of the aircraft after brake emergency application or overheat AMM 05-51-16-200-001.
(a) If brake overheat occurs on one wheel only, on a right and/or left MLG, do the steps A.(3) and A.(4).
(b) If brake overheat occurs on two wheels on a right and/or left MLG, do the step A.(3) only.
(3) Make sure that there is no trapped pressure in the wheel with a damaged brake.
(a) Make sure that the wheel chocks are in position AMM 10-11-00-555-015.
(b) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(c) On the panel 110VU, make sure that the PARK BRK control switch is at OFF.
(d) Do a check of the position of the brake unit pistons. If some brake pistons are extended, do this procedure: (Ref. TSM TASK 32-42-00-810-925).
(4) Do the functional test of the tachometers AMM 32-42-00-720-002.

If the test is not OK, go to para. 4.B. and 4.C.

Subtask 05-50-00-810-081-A

B. If the functional test of the tachometer is not OK
(1) Do a check of the connection of the normal-brake servovalve wiring
Make sure that there is no wiring cross connection on the normal brake servovalves (on the same landing gear) between:

15GG and 17GG for the left MLG
16GG and 18GG for the right MLG

(a) If there is a wiring cross connection:

disconnect the electrical connectors of the normal brake servovalves and connect them correctly.

(b) If there is no wiring cross connection:

do the step B. (2)

(2) Do a check of the tachometer wiring connection
(a) Remove one tachometer AMM 32-42-57-000-001 and do a visual inspection of its electrical wiring.
Make sure that there is no wiring cross connection between the tachometers.
1 If there is a wiring cross connection:

remove the other tachometer and connect them correctly AMM 32-42-57-000-001.
install the tachometers AMM 32-42-57-400-001.

2 If there is no wiring cross connection:

install the tachometer AMM 32-42-57-400-001.
do the step B. (3)

(3) Do a check of the wiring connection to the BSCU
If the tachometer test results are not satisfactory with no wiring cross connection on the normal brake servovalves and on the tachometers:

make sure that there is no cross connection between:
the connectors of the normal-brake servovalves (15GG), (16GG), (17GG), (18GG) and the connectors of the BSCU (10GG) ASM 324202
the connectors of the tachometers (19GG), (20GG), (21GG), (22GG) and the connectors of the BSCU (10GG) ASM 324202

Subtask 05-50-00-810-082-A

C. Test Confirmation
Do the functional test of the tachometer of the damaged wheel to make sure that there is no wiring cross connection AMM 32-42-00-720-002.

5. Close-up
Subtask 05-50-00-860-051-A

A. Put the aircraft back to its initial configuration.
(1) On the panel 110VU, set the PARK BRK control switch to ON.
(2) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.8 from Aug 2018] 2026.04.04 04:24:35 UTC