# SDR AJC2005F00002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 27, 2005
- Submitted: April 12, 2005
- Operation: Air carrier
- Aircraft: [N387PA](https://openairdocs.org/aircraft/N387PA), registered now
- Make and model: Israel ASTRA SPX
- Registry model: [Israel ASTRA SPX](https://openairdocs.org/model/israel-aircraft-industries-astra-spx) (OpenAirDocs)
- Aircraft serial: 145
- Engine: Pwa JT8D9A
- System (JASC): [3425 · Integrated Flight System](https://openairdocs.org/jasc/3425)
- Part: Ahrs
- Part number: 6229336400
- Condition: Intermittent
- Location: Nr 1
- Part time: 847 hours
- Stage of operation: LD
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AJC2005F00002

## Discrepancy

ON APPROACH THE NR 1 AHRS (ATTITUDE HEADING REFERENCE SYS) UNIT OPERATED INTERMITTENTLY, THE UNIT RED FLAGGED THE HEADING AND WAS UNABLE TO ENGAGE THE FLIGHT DIRECTOR.  THE CREW WAS UNABLE TO SWITCH THE NR 2 AHRS TO DRIVE THE NR 1 SIDE.  AC PROCEEDED AND LANDED SAFELY WITHOUT INCIDENT, DID NOT DECLARE AN EMERGENCY.  TROUBLESHOT SYSTEM AND FOUND THE NR 1 AHRS AHC-85E COMPUTER WAS AT FAULT.  REMOVED AND REPLACED UNIT.  COMPLIED WITH AHRS ADJUSTMENT/ TEST IAW MM.  OPS CHECK GOOD.  THE AIRCRAFT WAS RETURNED TO SERVICE.  (K) (EA25200507108)

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