DOC AIRBUS | TSM A320FLoss of the Reception of the ADIRU 1 Bus by One FAC or One FMGC
TASK 22-66-00-810-856-A
Loss of the Reception of the ADIRU 1 Bus by One FAC or One FMGC
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 22-66-00-865-073-A
Subtask 22-66-00-810-118-A
[Rev.8 from Aug 2018]
2026.04.04 04:25:20 UTC
Loss of the Reception of the ADIRU 1 Bus by One FAC or One FMGC
1. Possible Causes
- rejection of ADR parameters due to excessive offset
- FAC-1 [1CC1]
wiring of the ADC ADIRS OWN and the IRS ADIRS OWN bus from the FAC 1 (1CC1) to the first terminal block - FAC-2 [1CC2]
wiring of the ADC ADIRS OPP and the IRS ADIRS OPP bus from the FAC 2 (1CC2) to the first terminal block - FMGC-1 [1CA1]
wiring of the ADC ADIRS OWN and the IRS ADIRS OWN bus from the FMGC 1 (1CA1) to the first terminal block - FMGC-2 [1CA2]
wiring of the ADC ADIRS OPP and the IRS ADIRS OPP bus from the FMGC 2 (1CA2) to the first terminal block
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 34-11-00-810-861-A | Different Angle of Attack Value on the three ADIRUs |
| AMM 22-66-34-000-002 | Removal of the FAC |
| AMM 22-66-34-400-002 | Installation of the FAC |
| ASM 226901 | |
| AMM 22-83-34-000-001 | Removal of the FMGC |
| AMM 22-83-34-400-001 | Installation of the FMGC |
| ASM 228601 | |
| AMM 22-91-00-710-001 | Ground Scanning of the AFS |
| AMM 34-13-00-720-009 | Functional Test of the Altitude and Airspeed Data (A/C without RVSM capability on ADIRU 3) |
Subtask 22-66-00-865-073-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 22-66-00-710-160-A 4. Fault Isolation| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | NAV PROBES/ADIRU 1/AND AOA 1/26VAC | 5FP1 | F07 |
| 49VU | NAV PROBES/ADIRU1/115VAC | 4FP1 | F06 |
| 105VU | ADIRS/ADIRU1/28VDC | 6FP1 | C02 |
Subtask 22-66-00-810-118-A
A. If the test gives the maintenance message AFS: ADIRU1 (ISSUED BY: FAC1):
Subtask 22-66-00-810-119-A - do the Functional Check of Altitude/Airspeed Data AMM 34-13-00-720-009 to check if there is rejection of ADR parameters due to excessive offset :
- replace the FAC-1 [1CC1] AMM 22-66-34-000-002 and AMM 22-66-34-400-002.
- do the monitoring of the AOA sensors (Ref. TSM TASK 34-11-00-810-861).
- do a check and repair the
wiring of the ADC ADIRS OWN and the IRS ADIRS OWN bus from the FAC 1 (1CC1) to the first terminal block ASM 226901.
B. If the test gives the maintenance message AFS: ADIRU1 (ISSUED BY: FAC2):
Subtask 22-66-00-810-120-A - do the Functional Check of Altitude/Airspeed Data AMM 34-13-00-720-009 to check if there is rejection of ADR parameters due to excessive offset :
- replace the FAC-2 [1CC2] AMM 22-66-34-000-002 and AMM 22-66-34-400-002.
- do the monitoring of the AOA sensors (Ref. TSM TASK 34-11-00-810-861).
- do a check and repair the
wiring of the ADC ADIRS OPP and the IRS ADIRS OPP bus from the FAC 2 (1CC2) to the first terminal block ASM 226901.
C. If the test gives the maintenance message AFS: ADIRU1 (ISSUED BY: FG1):
Subtask 22-66-00-810-121-A - do the Functional Check of the Altitude/Airspeed Data AMM 34-13-00-720-009.
- replace the FMGC-1 [1CA1] AMM 22-83-34-000-001 and AMM 22-83-34-400-001.
- do a check and repair the
wiring of the ADC ADIRS OWN and the IRS ADIRS OWN bus from the FMGC 1 (1CA1) to the first terminal block ASM 228601.
D. If the test gives the maintenance message AFS: ADIRU1 (ISSUED BY: FG2):
Subtask 22-66-00-710-161-A - do the Functional Check of the Altitude/Airspeed Data AMM 34-13-00-720-009.
- replace the FMGC-2 [1CA2] AMM 22-83-34-000-001 and AMM 22-83-34-400-001.
- do a check and repair the
wiring of the ADC ADIRS OPP and the IRS ADIRS OPP bus from the FMGC 2 (1CA2) to the first terminal block ASM 228601.
E. Do the test given in Para. 3.