# SDR SWAA990767

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 27, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N339SW](https://openairdocs.org/aircraft/N339SW), registered now
- Make and model: Boeing 737-3H4
- Registry model: [Boeing 737-3H4](https://openairdocs.org/model/boeing-737-3h4) (OpenAirDocs)
- Aircraft serial: 24090
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 6552290
- Condition: Obstruction
- Location: Cabin
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA990767

## Discrepancy

AIR TURNBACK, DURING TAKEOFF, PRESSURIZATION AUTO FAIL LIGHT CAME ON, NO PRESSURIZATION CAPABILITY AT ALL.  DISCOVERED A PLASTIC TUBING DEBRIS OBSTRUCTING THE OUTFLOW VALVE TRAVEL.  REMOVED OBSTRUCTION, PRESSURIZED AIRCRAFT, OPS CHECKED GOOD PER MM.

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