DOC AIRBUS | TSM A320FLoss of GPS Data on the ADIRU1
TASK 34-58-00-810-825-A
Loss of GPS Data on the ADIRU1
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 34-58-00-740-098-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 34-58-00-810-074-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:33:34 UTC
Loss of GPS Data on the ADIRU1
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 31-32-00-869-002 | Procedure for the Class 3 Fault Reading |
| AMM 34-14-00-740-001 | Interface Test of the IR |
| AMM 34-36-31-000-001 | Removal of the ILS Receiver |
| AMM 34-36-31-400-001 | Installation of the ILS Receiver |
| AMM 34-58-31-000-001 | Removal of the GPSSU |
| AMM 34-58-31-400-001 | Installation of the GPSSU |
Subtask 34-58-00-740-098-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 34-58-00-810-074-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message GPSSU1 (1SN1) + GPSSU2 (1SN2):
Subtask 34-58-00-810-074-B ** ON A/C NOT FOR ALL - read the CFDIU CLASS 3 FAULTS for ATA 341400 and SOURCE IR1 AMM 31-32-00-869-002.
- Refer to the related trouble shooting procedure.
- replace the
[1SN1] and [1SN2] AMM 34-58-31-000-001 and AMM 34-58-31-400-001.
A. If the test gives the maintenance message GPSSU1 (1SN1) + GPSSU2 (1SN2):
Subtask 34-58-00-740-099-A ** ON A/C NOT FOR ALL - read the CFDIU CLASS 3 FAULTS for ATA 341400 and SOURCE IR1 AMM 31-32-00-869-002.
NOTE: In this case the GPSSU message is for the GPS part of the related MMR.
(1) If the CLASS 3 FAULTS report gives one or two of these maintenance messages GPSSU1 (1SN1)/ADIRU1 (1FP1) and GPSSU2 (1SN2)/ADIRU1 (1FP1): - refer to the related trouble shooting procedure.
- replace the MMR-1 [40RT1] and MMR-2 [40RT2] AMM 34-36-31-000-001 and AMM 34-36-31-400-001.
B. Do the test given in Para. 3.