DOC AIRBUS | TSM A320FLoss of the Reception of the ADIRU 3 Bus by One FAC or One FMGC
TASK 22-66-00-810-858-A
Loss of the Reception of the ADIRU 3 Bus by One FAC or One FMGC
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 22-66-00-865-075-A
Subtask 22-66-00-810-126-A
[Rev.8 from Aug 2018]
2026.04.04 04:25:21 UTC
Loss of the Reception of the ADIRU 3 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 3 and the IRS ADIRS 3 bus from the FAC 1 (1CC1) to the first terminal block - FAC-2 [1CC2]
wiring of the ADC ADIRS 3 and the IRS ADIRS 3 bus from the FAC 2 (1CC2) to the first terminal block - FMGC-1 [1CA1]
wiring of the ADC ADIRS 3 and the IRS ADIRS 3 bus from the FMGC 1 (1CA1) to the first terminal block - FMGC-2 [1CA2]
wiring of the ADC ADIRS 3 and the IRS ADIRS 3 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 22-66-00-865-075-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 22-66-00-710-164-A 4. Fault Isolation| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | NAV PROBES/ADIRU3/PWR/SWTG | 8FP | F09 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | NAV PROBES/ADIRU3/PWR/SWTG | 8FP | F08 |
| ** ON A/C ALL | |||
| 121VU | ADIRS/ADIRU/3PWR/SWTG | 9FP | N09 |
| 121VU | ADIRS/ADIRU/3/26VAC AND AOA | 5FP3 | N07 |
| 121VU | ADIRS/ADIRU/3/115VAC | 4FP3 | N05 |
| 121VU | ADIRS/ADIRU/3/28VDC | 6FP3 | N03 |
Subtask 22-66-00-810-126-A
A. If the test gives the maintenance message AFS: ADIRU3 (ISSUED BY: FAC1):
Subtask 22-66-00-810-127-A - do the Functional Check of the 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 3 and the IRS ADIRS 3 bus from the FAC 1 (1CC1) to the first terminal block ASM 226901.
B. If the test gives the maintenance message AFS: ADIRU3 (ISSUED BY: FAC2):
Subtask 22-66-00-810-128-A - do the Functional Check of the 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 3 and the IRS ADIRS 3 bus from the FAC 2 (1CC2) to the first terminal block ASM 226901.
C. If the test gives the maintenance message AFS: ADIRU3 (ISSUED BY: FG1):
Subtask 22-66-00-810-129-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 3 and the IRS ADIRS 3 bus from the FMGC 1 (1CA1) to the first terminal block ASM 228601.
D. If the test gives the maintenance message AFS: ADIRU3 (ISSUED BY: FG2):
Subtask 22-66-00-710-165-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 3 and the IRS ADIRS 3 bus from the FMGC 2 (1CA2) to the first terminal block ASM 228601.
E. Do the test given in Para. 3.