DOC AIRBUS | TSM A320FLoss of the RA1 and RA2 Data to the TCAS
TASK 34-43-00-810-819-A
Loss of the RA1 and RA2 Data to the TCAS
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 34-43-00-740-080-A 4. Fault Isolation
Subtask 34-43-00-810-069-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:33:13 UTC
Loss of the RA1 and RA2 Data to the TCAS
1. Possible Causes
- CMPTR-TCAS [1SG]
- XCVR-RA, 1 [2SA1]
- XCVR-RA, 2 [2SA2]
wiring of the RADIO ALTITUDE 1 bus from the TCAS computer (1SG) to the radio altimeter transceiver 1 (2SA1) wiring of the RADIO ALTITUDE 2 bus from the TCAS computer (1SG) to the radio altimeter transceiver 2 (2SA2)
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 34-42-00-740-002 | BITE Test of the Radio Altimeter |
| AMM 34-42-33-000-001 | Removal of the Radio Altimeter Transceiver |
| AMM 34-42-33-400-001 | Installation of the Radio Altimeter Transceiver |
| 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 |
Subtask 34-43-00-740-080-A 4. Fault Isolation
Subtask 34-43-00-810-069-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance messages RA1(1SA1)/TCAS(1SG) and RA2(1SA2)/TCAS(1SG):
Subtask 34-43-00-810-069-B ** ON A/C NOT FOR ALL - do the BITE test of the radio altimeter AMM 34-42-00-740-002.
- Do the trouble shooting procedure related to the maintenance message.
- replace the CMPTR-TCAS [1SG] AMM 34-43-34-000-001 and AMM 34-43-34-400-001.
- replace the XCVR-RA, 1 [2SA1] and the XCVR-RA, 2 [2SA2] AMM 34-42-33-000-001 and AMM 34-42-33-400-001.
- do a check and repair the
wiring of the RADIO ALTITUDE 1 bus from the TCAS computer (1SG) to the radio altimeter transceiver 1 (2SA1) - do a check and repair the
wiring of the RADIO ALTITUDE 2 bus from the TCAS computer (1SG) to the radio altimeter transceiver 2 (2SA2)
ASM 344301.
A. If the test gives the maintenance message RA1(1SA1) + RA2(1SA2)/TCAS (1SG):
Subtask 34-43-00-740-081-A - do the BITE test of the radio altimeter AMM 34-42-00-740-002.
- Do the trouble shooting procedure related to the maintenance message.
- replace the CMPTR-TCAS [1SG] AMM 34-43-34-000-001 and AMM 34-43-34-400-001.
- replace the XCVR-RA, 1 [2SA1] and the XCVR-RA, 2 [2SA2] AMM 34-42-33-000-001 and AMM 34-42-33-400-001.
- do a check and repair the
wiring of the RADIO ALTITUDE 1 bus from the TCAS computer (1SG) to the radio altimeter transceiver 1 (2SA1) - do a check and repair the
wiring of the RADIO ALTITUDE 2 bus from the TCAS computer (1SG) to the radio altimeter transceiver 2 (2SA2)
ASM 344301.
B. Do the test given in Para. 3.