DOC AIRBUS | TSM A320FLoss of Alternate Braking on one Landing Gear (HYD Failure)
TASK 32-43-00-810-813-A
Loss of Alternate Braking on one Landing Gear (HYD Failure)
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 32-43-00-710-058-A ** ON A/C NOT FOR ALL
Subtask 32-43-00-810-062-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:31:41 UTC
Loss of Alternate Braking on one Landing Gear (HYD Failure)
1. Possible Causes
- hydraulic line
- DUAL VALVE-ALTN BRK DISTR [2577GM]
- DUAL SHUTTLE VALVE-BRK YELLOW PRESS [2578GM]
- related self-sealing couplings
- alternate brake pistons
- BRAKE-WHEEL 1 [2643GM]
- BRAKE-WHEEL 2 [2641GM]
- BRAKE-WHEEL 3 [2644GM]
- BRAKE-WHEEL 4 [2642GM]
- MANIFOLD-ALTN BRK, L [2853GM]
- MANIFOLD-ALTN BRK, R [2852GM]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 32-42-27-000-001 | Removal of the Brake |
| AMM 32-42-27-400-001 | Installation of the Brake |
| AMM 32-43-00-710-001 | Operational Check of Alternate Braking System |
| AMM 32-43-14-000-001 | Removal of the Dual-Valve Alternate Brake-Distribution |
| AMM 32-43-14-400-001 | Installation of the Dual-Valve Alternate Brake-Distribution |
| AMM 32-43-32-600-001 | Reactivation of the Alternate-Brake Manifold Safety-Valve |
| AMM 32-45-16-000-001 | Removal of the Dual Shuttle Valve |
| AMM 32-45-16-400-001 | Installation of the Dual Shuttle Valve |
Subtask 32-43-00-710-058-A ** ON A/C NOT FOR ALL
A. Test
(1) Do the operational test of alternate braking with anti-skid AMM 32-43-00-710-001.
(2) Make sure that there is no pressure to the related side on the triple indicator.
Subtask 32-43-00-710-058-B ** ON A/C NOT FOR ALL (1) Do the operational test of alternate braking with anti-skid AMM 32-43-00-710-001.
(2) Make sure that there is no pressure to the related side on the triple indicator.
A. Test
(1) Do the Operational Check to start the Functional Test of the Alternate Braking Automatically (flight simulated) .
4. Fault Isolation(1) Do the Operational Check to start the Functional Test of the Alternate Braking Automatically (flight simulated) .
Subtask 32-43-00-810-062-A ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
Subtask 32-43-00-810-062-B ** ON A/C NOT FOR ALL - do a check and repair if necessary the leak of the hydraulic line between the alternate-brake distribution dual-valve (2577GM) and the brake Yellow dual shuttle-valve (2578GM).
- replace the DUAL VALVE-ALTN BRK DISTR [2577GM] AMM 32-43-14-000-001 and AMM 32-43-14-400-001.
- replace the DUAL SHUTTLE VALVE-BRK YELLOW PRESS [2578GM] AMM 32-45-16-000-001 and AMM 32-45-16-400-001.
A. If the operational check gives maintenance message related to alternate braking system:
- Do the trouble shooting procedure related to the mainternance message.
- do a check of the connection of the related self-sealing couplings.
- correctly adjust the related self-sealing couplings .
- do a check for leaks on the alternate brake pistons of the related wheels .
- replace the related BRAKE-WHEEL 1 [2643GM] or BRAKE-WHEEL 2 [2641GM] ; BRAKE-WHEEL 3 [2644GM] or BRAKE-WHEEL 4 [2642GM] AMM 32-42-27-000-001 AMM 32-42-27-400-001
- do a check for leaks on the hydraulic line between the MANIFOLD-ALTN BRK, L [2853GM] or MANIFOLD-ALTN BRK, R [2852GM] and the related brakes unit (wheel 1,2) or (wheel 3,4).
- repair the leaks and reactivate the safety valve on the related MANIFOLD-ALTN BRK, L [2853GM] or MANIFOLD-ALTN BRK, R [2852GM] AMM 32-43-32-600-001.