# SDR SWAA101838

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 30, 2010
- Submitted: April 6, 2010
- Operation: Air carrier
- Aircraft: [N335SW](https://openairdocs.org/aircraft/N335SW), registered now
- Make and model: Boeing 737-3H4
- Registry model: [Boeing 737-3H4](https://openairdocs.org/model/boeing-737-3h4) (OpenAirDocs)
- Aircraft serial: 23939
- Aircraft time: 71,211 hours, 63,644 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 711003
- Condition: Faulty
- Location: Cabin Pressure
- Stage of operation: DE
- How discovered: O
- Nature of condition: P
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA101838

## Discrepancy

DURING DESCENT THROUGH 7000FT, OUTFLOW VALVE WENT FULL OPEN WITH LOSS OF CABIN PRESSURE.  NO AUTO FAIL LIGHT.  REMOVED AND REPLACED AFT OUTFLOW VALVE PER MM.

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