# SDR SWAA991132

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 3, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N727SW
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 27859
- System (JASC): [2611 · Smoke Detection](https://openairdocs.org/jasc/2611)
- Part: Smoke Detector
- Part number: PU90499R3
- Condition: Malfunctioned
- Location: Lavatory
- Stage of operation: CL
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA991132

## Discrepancy

AIR TURNBACK---- LOUD NOISE APPEARS TO COME FROM F/O'S WINDOW ABOVE 9000 FEET.  FOUND FWD AND AFT LAV SMOKE DETECTORS ALARMING.  REMOVED AND REPLACED SMOKE DETECTORS PER MM, NOISE WENT AWAY.

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