Intermittent Electrical Failure of Normal Brake Servovalves 15GG #amp# 17GG

TASK 32-42-00-810-957-A
Intermittent Electrical Failure of Normal Brake Servovalves 15GG & 17GG

1. Possible Causes

WHEEL-MLG, 1 [2651GM]
WHEEL-MLG, 2 [2649GM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-860-009	Procedure to Get Access to the SYSTEM REPORT/TEST/L/G Page
AMM 32-41-11-000-006	Removal of the MLG Wheel
AMM 32-41-11-400-006	Installation of the MLG Wheel
AMM 32-46-00-02-
AMM 32-46-00-740-005	BITE Test of BSCU - Normal Braking TEST

3. Fault Confirmation
Subtask 32-42-00-810-262-A ** ON A/C NOT FOR ALL

A. Test

NOTE: This task is applicable to conditions in which the BRAKES CH/SYS X FAULT and/or BRAKES NORM BRK FAULT ECAM warnings come on intermittently.

(1) Do the BITE test of the normal braking system AMM 32-46-00-740-005.
(2) Get access to the SYSTEM REPORT/TEST/L/G page AMM 31-32-00-860-009.

ACTION	RESULT
Push the line key adjacent to the BSCU1 or BSCU2 indication.	The BSCU1 or BSCU2 page comes into view.
Push the line key adjacent to the TROUBLE SHOOT DATA indication.	The TROUBLE SHOOTING DATA page comes into view.

(3) If the TSD gives a fault code:
(a) Do the related trouble shooting procedure.
(4) If the TSD gives no fault code:
(a) Read the PREVIOUS LEGS REPORT of the BSCU on the MCDU main page AMM 32-46-00-02-.
1 Do a check of the last ten flight entries in the aircraft logbook:

If there is a fault code 33 or 34 that occurred during the flight operational phases 3, 4 or 8, and
If the normal brake servovalve current is of 2.0 mA on the TSD -Internal fault detail page 1/2 of the PREVIOUS LEGS REPORT (Figure Ref. SD 32-46-00-14000-00-B), go to the Para Fault Isolation.
If there is no fault code 33 or 34 on BSCU CH/SYS 1 or BSCU CH/SYS 2, no action is necessary.

4. Fault Isolation
Subtask 32-42-00-740-214-A ** ON A/C NOT FOR ALL

A. Replace the WHEEL-MLG, 1 [2651GM] and WHEEL-MLG, 2 [2649GM] , AMM 32-41-11-000-006 and AMM 32-41-11-400-006.

NOTE: An unbalance of the wheels on the same MLG can increase vibrations at the normal brake servovalves and cause fault codes 33 and 34.

[Rev.8 from Aug 2018] 2026.04.04 04:40:16 UTC