# SDR TRBA2006078

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 17, 2006
- Submitted: November 3, 2006
- Operation: Air carrier
- Aircraft: N342AT
- Make and model: Aerosp ATR 72-212
- Registry model: [Aerosp ATR 72-212](https://openairdocs.org/model/aerospatiale-atr-72-212) (OpenAirDocs)
- Aircraft serial: 345
- System (JASC): [3420 · Attitude and Direction Data System](https://openairdocs.org/jasc/3420)
- Part: Ahrs
- Part number: 7003360947
- Part serial: 94113036
- Condition: Defective
- Location: Nr 1
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/TRBA2006078

## Discrepancy

DURING CLIMB, BOTH ATTITUDE HEADING REFERENCE SYSTEM (AHRS) FAULTED.  A/C RETURNED TO SJU AIRPORT AND DECLARED EMERGENCY.  REPLACED NR 1 ATTITUDE HEADING REFERENCE UNIT (AHRU) AND PERFORMED OPS CHECK AS PER JIC 34-28-81 AND FOUND SYSTEM WORKING PROPERLY.  (M)

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