# SDR SWAA095308

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 18, 2009
- Submitted: August 19, 2009
- Operation: Air carrier
- Aircraft: N367SW
- Make and model: Boeing 737-3H4
- Registry model: [Boeing 737-3H4](https://openairdocs.org/model/boeing-737-3h4) (OpenAirDocs)
- Aircraft serial: 26578
- Aircraft time: 54,163 hours, 46,323 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 322684004
- Part serial: GWD00321
- Condition: Faulty
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA095308

## Discrepancy

AIR TURNBACK / DECLARED EMERGENCY.  FLT 220 CRUISE CABIN ALT WARNING HORN SOUNDED.  CABIN ALTS CLIMBING AT 700FT/MIN.  PERFORMED CABIN ALT WARN/ABNORMAL PRESS CHECK PER QRH AND INITIATED DESCENT COULDN'T GET CABIN TO DESCEND ON NORMAL PRESS.  CONTROLLED CABIN USING MAIN DC.  REMOVED AND REPLACED OUTFLOW VALVE ASSY PER MM.

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