DOC AIRBUS | TSM A320FLoss of the signals from the left tachometers to the BSCU
TASK 32-42-00-810-942-A
Loss of the signals from the left tachometers to the BSCU
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 32-42-00-720-082-A 4. Fault Isolation
Subtask 32-42-00-810-228-A
[Rev.8 from Aug 2018]
2026.04.04 04:31:39 UTC
Loss of the signals from the left tachometers to the BSCU
1. Possible Causes
wiring from the left tachometers to the BSCU (10GG) - BSCU [10GG]
- TACHOMETER-WHEEL 1 [19GG]
- TACHOMETER-WHEEL 2 [21GG]
- DRIVE ASSY-TACHOMETER,WHEEL 1 [2681GM]
- DRIVE ASSY-TACHOMETER,WHEEL 2 [2680GM]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 32-42-00-720-002 | Functional Test of the Tachometers and the Anti-Skid System with the Normal Braking System ON |
| AMM 32-42-34-000-001 | Removal of the Braking/Steering Control Unit (BSCU) |
| AMM 32-42-34-400-001 | Installation of the Braking/Steering Control Unit (BSCU) |
| AMM 32-42-57-000-001 | Removal of the Tachometer |
| AMM 32-42-57-400-001 | Installation of the Tachometer |
| AMM 32-42-68-000-003 | Removal of the MLG Tachometer-Drive |
| AMM 32-42-68-400-003 | Installation of the MLG Tachometer-Drive |
Subtask 32-42-00-720-082-A 4. Fault Isolation
Subtask 32-42-00-810-228-A
A. If the test confirms the fault:
Subtask 32-42-00-720-083-A - Do a check and repair the
wiring from the left tachometers to the BSCU (10GG)
- replace the BSCU [10GG] AMM 32-42-34-000-001 AMM 32-42-34-400-001
- replace the TACHOMETER-WHEEL 1 [19GG] and TACHOMETER-WHEEL 2 [21GG] AMM 32-42-57-000-001 AMM 32-42-57-400-001
- replace the DRIVE ASSY-TACHOMETER,WHEEL 1 [2681GM] and DRIVE ASSY-TACHOMETER,WHEEL 2 [2680GM] AMM 32-42-68-000-003 AMM 32-42-68-400-003
B. Do the test given in Para.3.A.