DOC AIRBUS | TSM A320FLoss of the ATC1 Data Detected by the ATSU
TASK 46-21-00-810-850-A
Loss of the ATC1 Data Detected by the ATSU
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 46-21-00-740-144-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 46-21-00-810-099-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:34:21 UTC
Loss of the ATC1 Data Detected by the ATSU
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| 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 |
| AMM 46-21-00-740-001 | BITE Test of the ATIMS |
| ASM 462105 | |
| AMM 46-21-34-000-001 | Removal of the Air Traffic Service Unit (ATSU) |
| AMM 46-21-34-400-001 | Installation of the Air Traffic Service Unit (ATSU) |
Subtask 46-21-00-740-144-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 46-21-00-810-099-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message XPDR1(1SH1)/ATSU1(1TX1):
Subtask 46-21-00-740-145-A ** ON A/C NOT FOR ALL - replace the XPDR-ATC/MODE S, 1 [1SH1] AMM 34-52-33-000-001 and AMM 34-52-33-400-001.
- replace the ATSU [1TX1] AMM 46-21-34-000-001 and AMM 46-21-34-400-001.
- remove the XPDR-ATC/MODE S, 1 and the ATSU
- do a check and repair the
wiring of the XPDR-ATC/MODE S, 1 INPUT BUS : from pins AA/5G,5H of the XPDR-ATC/MODE S, 1 to pins AA/4A,4B of the ATSU ASM 462105 - install the XPDR-ATC/MODE S, 1 and the ATSU.
B. Do the test given in Para. 3.