# SDR SWAA053179

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 13, 2005
- Submitted: October 14, 2005
- Operation: Air carrier
- Aircraft: N639SW
- Make and model: Boeing 737-3H4
- Registry model: [Boeing 737-3H4](https://openairdocs.org/model/boeing-737-3h4) (OpenAirDocs)
- Aircraft serial: 27712
- Aircraft time: 31,029 hours, 25,964 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 40631997201AB
- Part serial: 9910552
- Condition: Faulty
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA053179

## Discrepancy

DIVERSION/DECLARED EMERGENCY CABIN ALTITUDE WARNING HORN SOUNDED.  ALTERNATE & MANUAL POSITIONS INOP.  REMOVED AND REPLACED AFT OUTFLOW VALVE PER MM.

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