# SDR SWAA101481

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 12, 2010
- Submitted: March 15, 2010
- Operation: Air carrier
- Aircraft: [N501SW](https://openairdocs.org/aircraft/N501SW), registered now
- Make and model: Boeing 737-5H4
- Registry model: [Boeing 737-5H4](https://openairdocs.org/model/boeing-737-5h4) (OpenAirDocs)
- Aircraft serial: 24178
- Aircraft time: 61,919 hours, 60,321 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 7110033
- Condition: Faulty
- Location: Cabin Pressure
- Stage of operation: CL
- 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/SWAA101481

## Discrepancy

AIR TURNBACK / DECLARED EMERGENCY.  ON CLIMB PASSING FL 240 CABIN ALT WARN HORN SOUNDED.  CABIN ALT CONTINUED DESCENT TO LANDING AT 500FT / MIN IN AUTO MAX CABIN ALT 10" STABILIZED AT 3" IN AUTO.  REMOVED AND REPLACED OUTFLOW VALVE AND HEATER GASKET PER MM.

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