DOC AIRBUS | TSM A320FLoss of the TCAS Output Bus Detected by the DMC3
TASK 31-63-81-810-865-A
Loss of the TCAS Output Bus Detected by the DMC3
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 31-63-81-865-051-A
Subtask 31-63-81-810-122-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:30:59 UTC
Loss of the TCAS Output Bus Detected by the DMC3
1. Possible Causes
- CMPTR-TCAS [1SG]
- wiring
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 31-60-00-740-002 | Perform Electronic Instrument System (EIS) Input Test |
| AMM 31-60-00-740-007 | GROUND SCANNING Test of the DMC |
| ASM 344301 | |
| AMM 34-43-34-000-001 | Removal of the TCAS Computer |
| AMM 34-43-34-400-001 | Installation of the TCAS Computer |
Subtask 31-63-81-865-051-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 31-63-81-740-178-A ** ON A/C NOT FOR ALL Subtask 31-63-81-740-178-C ** ON A/C NOT FOR ALL 4. Fault Isolation| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | COM NAV/TCAS | 4SG | K10 |
Subtask 31-63-81-810-122-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message:
DMC3: NO TCAS DATA
Subtask 31-63-81-810-122-C ** ON A/C NOT FOR ALL DMC3: NO TCAS DATA
- replace the CMPTR-TCAS [1SG] AMM 34-43-34-000-001 and AMM 34-43-34-400-001.
- do a check and repair the wiring from TCAS computer (1SG) pins AE/7C, 7D to the first terminal block ASM 344301.
A. If the test gives the maintenance message:
TCAS(1SG)/DMC3(1WT3)
Subtask 31-63-81-740-179-A TCAS(1SG)/DMC3(1WT3)
- replace the CMPTR-TCAS [1SG] AMM 34-43-34-000-001 and AMM 34-43-34-400-001.
- do a check and repair the wiring from TCAS computer (1SG) pins AE/7C, 7D to the first terminal block ASM 344301.
B. Do the test given in Para. 3.B.