# SDR AALA2018091869003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 14, 2018
- Submitted: September 18, 2018
- Operation: Air carrier
- Aircraft: N275AY
- Make and model: Airbus A330-323
- Registry model: [Airbus A330-323](https://openairdocs.org/model/airbus-a330-323) (OpenAirDocs)
- Aircraft serial: 370
- Aircraft time: 79,395 hours, 11,242 cycles
- System (JASC): [3441 · Inertial Guidance System](https://openairdocs.org/jasc/3441)
- Part: Adiru
- Part number: 46502003030316
- Part serial: 3278
- Condition: Faulted
- Part time: 55,255 hours, 21,869 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: G, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA2018091869003

## Discrepancy

1.5 HOURS INTO FLIGHT, AT FL350, RECEIVED A MESSAGE FOR NAV ADR 2 & 3 FAULT.   RECEIVED AN AUTO FLT AP OFF /AUTO FLT, A/THR OFF / F/CTL ALTN LAW.  FLIGHT DECLARED AN EMERGENCY,  RETURNED TO DEPARTURE,  AND LANDED WITHOUT FURTHER INCIDENT.  THE AIRCRAFT WAS GROUNDED.  REPLACED AIR DATA INERTIAL REFERENCE UNIT NR 2 AND 3 IAW AMM 34-12-34.  OPS CHECKED GOOD.  ALSO PERFORMED AN OPS TESTED IAW AMM 34-10-00-860-801-A, 34-10-00-860-802-A,  AND 34-10-00860-803-A. ALL TESTED GOOD.

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