# SDR SWAA021772

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 6, 2002
- Submitted: August 13, 2002
- Operation: Air carrier
- Aircraft: N373SW
- Make and model: Boeing 737-3H4
- Registry model: [Boeing 737-3H4](https://openairdocs.org/model/boeing-737-3h4) (OpenAirDocs)
- Aircraft serial: 26581
- Aircraft time: 31,025 hours, 28,018 cycles
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 322684004
- Part serial: GWD04375
- Condition: Failed
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA021772

## Discrepancy

DECLARED EMERGENCY, DIVERSION, AT FL310, ALTITUDE WARNING HORN CAME ON.  CABIN ALT AT 10,000 FEET CLIMBING.  REMOVED AND REPLACED FWD AND AFT OUT FLOW VALVES, DELTA P MODULE, OVERHEAD MODULE, A/C ACCESSORY UNIT, CABIN PRESS CONTROLLER AND LOWER SAFETY RELIEF VALVE PER MM.

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