# SDR SWAA010478

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 14, 2001
- Submitted: February 20, 2001
- Operation: Air carrier
- Aircraft: [N331SW](https://openairdocs.org/aircraft/N331SW), registered now
- Make and model: Boeing 737-3H4
- Registry model: [Boeing 737-3H4](https://openairdocs.org/model/boeing-737-3h4) (OpenAirDocs)
- Aircraft serial: 23695
- Aircraft time: 42,691 hours, 41,607 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Sensor
- Part number: 896767
- Condition: Faulty
- Location: Apu
- Stage of operation: DE
- How discovered: O
- Nature of condition: N
- Precautionary procedure: F
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA010478

## Discrepancy

DECLARED EMERGENCY.  DURING APU START,  APU FIRE WARNING LIGHT ILLUMINATED.  APU FIRE HANDLE PULLED.  NO OTHER IND OF APU FIRE.  INSPECTED APU AREA FOR EVIDENCE OF FIRE.  NO DEFECT NOTED.  DEFERRED APU SYS.  DURING RON IN HOU, FOUND APU TAILPIPE HARNESS AND SENSOR DEFECTIVE.  REMOVED AND REPLACED BOTH PER MM.  OPS CK GOOD.  APU FIRE BOTTLE REPLACED.

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