DOC AIRBUS | TSM A320FLoss of the ATC1 and ATC2 Data to the TCAS
TASK 34-43-00-810-822-A
Loss of the ATC1 and ATC2 Data to the TCAS
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 34-43-00-740-086-A 4. Fault Isolation
Subtask 34-43-00-810-072-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:33:13 UTC
Loss of the ATC1 and ATC2 Data to the TCAS
1. Possible Causes
- CTL UNIT-ATC/TCAS [3SH]
- CMPTR-TCAS [1SG]
- XPDR-ATC/MODE S, 1 [1SH1]
- XPDR-ATC/MODE S, 2 [1SH2]
wiring of the XT COORD-1 bus from the ATC/Mode S transponder 1 (1SH1) to the TCAS computer (1SG) wiring of the XT COORD-2 bus from the ATC/Mode S transponder 2 (1SH2) to the TCAS computer (1SG)
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 34-43-00-740-001 | BITE Test of the TCAS |
| ASM 344301 | |
| AMM 34-43-34-000-001 | Removal of the TCAS Computer |
| AMM 34-43-34-400-001 | Installation of the TCAS Computer |
| AMM 34-52-00-740-004 | BITE Test of the ATC |
| AMM 34-52-12-000-001 | Removal of the ATC/TCAS Control Unit |
| AMM 34-52-12-400-001 | Installation of the ATC/TCAS Control Unit |
| AMM 34-52-33-000-001 | Removal of the ATC/Mode S Transponder |
| AMM 34-52-33-400-001 | Installation of the ATC/Mode S Transponder |
Subtask 34-43-00-740-086-A 4. Fault Isolation
Subtask 34-43-00-810-072-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance messages ATC1 (1SH1)/TCAS (1SG) and ATC2 (1SH2)/TCAS (1SG):
Subtask 34-43-00-810-072-B ** ON A/C NOT FOR ALL - do the BITE test of the ATC AMM 34-52-00-740-004.
- Do the trouble shooting procedure related to the maintenance message.
- replace the CTL UNIT-ATC/TCAS [3SH] AMM 34-52-12-000-001 and AMM 34-52-12-400-001.
- replace the CMPTR-TCAS [1SG] AMM 34-43-34-000-001 and AMM 34-43-34-400-001.
- replace the XPDR-ATC/MODE S, 1 [1SH1] and the XPDR-ATC/MODE S, 2 [1SH2] AMM 34-52-33-000-001 and AMM 34-52-33-400-001.
- do a check and repair the
wiring of the XT COORD-1 bus from the ATC/Mode S transponder 1 (1SH1) to the TCAS computer (1SG) : pins AA/5G, 5H to pins AE/14F, 14G - do a check and repair the
wiring of the XT COORD-2 bus from the ATC/Mode S transponder 2 (1SH2) to the TCAS computer (1SG) : pins AA/5G, 5H to pins AE/14H, 14J
ASM 344301.
A. If the test gives the maintenance message ATC1(1SH1) + ATC2(1SH2)/TCAS(1SG):
Subtask 34-43-00-740-087-A - do the BITE test of the ATC AMM 34-52-00-740-004.
- Do the trouble shooting procedure related to the maintenance message.
- replace the CTL UNIT-ATC/TCAS [3SH] AMM 34-52-12-000-001 and AMM 34-52-12-000-001.
- replace the CMPTR-TCAS [1SG] AMM 34-43-34-000-001 and AMM 34-43-34-400-001.
- replace the XPDR-ATC/MODE S, 1 [1SH1] and the XPDR-ATC/MODE S, 2 [1SH2] AMM 34-52-33-000-001 and AMM 34-52-33-400-001.
- do a check and repair the
wiring of the XT COORD-1 bus from the ATC/Mode S transponder 1 (1SH1) to the TCAS computer (1SG) : pins AA/5G, 5H to pins AE/14F, 14G - do a check and repair the
wiring of the XT COORD-2 bus from the ATC/Mode S transponder 2 (1SH2) to the TCAS computer (1SG) : pins AA/5G, 5H to pins AE/14H, 14J
ASM 344301.
B. Do the test given in Para. 3.