# SDR MALA030205

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 20, 2003
- Submitted: March 24, 2003
- Operation: Air carrier
- Aircraft: N363PX
- Make and model: Saab 340B
- Registry model: [Saab 340B](https://openairdocs.org/model/saab-340b) (OpenAirDocs)
- Aircraft serial: 340B260
- System (JASC): [3420 · Attitude and Direction Data System](https://openairdocs.org/jasc/3420)
- Part: Computer
- Part number: 6227713004
- Part serial: 1347
- Condition: Failed
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MALA030205

## Discrepancy

DURING FLIGHT 2737, LT DPU C/B POPPED.  LEFT SIDE DPU 1 (G-18) CIRCUIT BREAKER OUT, (POPPED) RESET ONCE, AND POPPED AGAIN.  RT SIDE HEADING (F/O) DID NOT MATCH MAG COMPASS.  AIR RETURN TO DTW.  MAINTENANCE REMOVED AND REPLACED NR 1 DPU P/N 622-7713-004, SN/ON 6924, SN/OFF 1347.  ALL CHECKS GOOD IAW SF340 MM.

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