Failure of the BRK ALTN Selector Valve closed position

TASK 32-43-00-810-823-A
Failure of the BRK ALTN Selector Valve closed position

1. Possible Causes

SEL VALVE-ALTN BRK [99GG]
ABCU [95GG]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-43-00-710-002	Operational Check to start the Functional Test of the Alternate Braking Automatically (flight simulated)
ASM 324303
AMM 32-43-34-000-001	Removal of the Alternate Braking Control Unit (ABCU)
AMM 32-43-51-000-001	Removal of the Alternate Braking Selector Valve
AMM 32-43-51-400-001	Installation of the Alternate Braking Selector Valve
TSM TASK 32-42-00-03	NORMAL BRAKING - TASK SUPPORTING DATA

3. Fault Confirmation
Subtask 32-43-00-740-064-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational check to start the functional test of the Alternate Braking automatically (flight simulated) AMM 32-43-00-710-002.
(2) Read the TROUBLE SHOOTING DATA of the BSCU on the MCDU 32-42-00-03 TSM TASK 32-42-00-03.
(3) Print the TROUBLE SHOOTING DATA of the BSCU.

4. Fault Isolation
Subtask 32-43-00-810-072-A ** ON A/C NOT FOR ALL

A. If the operational check gives the maintenance message BRK ALTN SELECTOR VALVE (99GG)/ABCU (95GG) with the fault code 1511:
(1) Do a check of the Alternate Pressure Transducer Left (APTL) and Alternate Pressure Transducer Right (APTR) pressure values 32-42-00-03 TSM TASK 32-42-00-03 printed in step 3.A.(3).
(2) If the Alternate Pressure Transducer Left (APTL) and the Alternate Pressure Transducer Right (APTR) values are less than 30 bar (435.1131 psi).

replace the SEL VALVE-ALTN BRK [99GG] AMM 32-43-51-000-001 AMM 32-43-51-400-001

(3) If the fault continues:

replace the ABCU [95GG] AMM 32-43-34-000-001

(4) If the fault continues:

Do a check and repair the wiring between the ABCU and the ALTN SELECTOR VALVE (99GG) ASM 324303.

Subtask 32-43-00-740-065-A ** ON A/C NOT FOR ALL

B. Do the test given in Para.3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:31:41 UTC