Brake Fan Inoperative on One Brake

TASK 32-48-00-810-801-A
Brake Fan Inoperative on One Brake

1. Possible Causes

impeller
MOTOR ASSY-BRK FAN,WHEEL AXLE 1 [7GS]
MOTOR ASSY-BRK FAN,WHEEL AXLE 2 [9GS]
MOTOR ASSY-BRK FAN,WHEEL AXLE 3 [8GS]
MOTOR ASSY-BRK FAN,WHEEL AXLE 4 [10GS]
wiring from the brake-fan motor assy pin A/1, 2, 3 to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-48-00-710-001	Functional Test of The Brake Cooling System
ASM 324801
AMM 32-48-51-000-002	Removal of the Impeller Assy
AMM 32-48-51-000-005	Removal of the Fan Assy
AMM 32-48-51-400-002	Installation of the Impeller Assy
AMM 32-48-51-400-005	Installation of the Fan Assy

3. Fault Confirmation
Subtask 32-48-00-710-050-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of the brake cooling system AMM 32-48-00-710-001.
(2) Make sure that the fan does not operate on the related brake.

4. Fault Isolation
Subtask 32-48-00-810-050-A ** ON A/C NOT FOR ALL

A. If the test confirms the fault:

Do a check of the related impeller

(1) If the impeller is not OK:

Replace the impeller AMM 32-48-51-000-002 and AMM 32-48-51-400-002.

(2) If the impeller is OK and if the fault continues:

Replace the related fan:
MOTOR ASSY-BRK FAN,WHEEL AXLE 1 [7GS] or MOTOR ASSY-BRK FAN,WHEEL AXLE 2 [9GS] or MOTOR ASSY-BRK FAN,WHEEL AXLE 3 [8GS] or MOTOR ASSY-BRK FAN,WHEEL AXLE 4 [10GS] AMM 32-48-51-000-005 and AMM 32-48-51-400-005.

(3) If the fault continues:

Do a check and repair the wiring related to the defective fan:
Repair the wiring from the brake-fan motor assy pin A/1, 2, 3 to the first terminal block ASM 324801.

Subtask 32-48-00-710-051-A ** ON A/C NOT FOR ALL

B. Test
Do the test given in Para. 3.A.(1).

[Rev.8 from Aug 2018] 2026.04.04 04:40:17 UTC