# SDR SWAA990265

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 15, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N354SW](https://openairdocs.org/aircraft/N354SW), registered now
- Make and model: Boeing 737-3H4
- Registry model: [Boeing 737-3H4](https://openairdocs.org/model/boeing-737-3h4) (OpenAirDocs)
- Aircraft serial: 25219
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Valve
- Condition: Lack Of Lube
- Location: A/C Bay
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA990265

## Discrepancy

ON TAKEOFF PRESSURIZATION WAS NORMAL UNTIL APPROXIMATELY 500 FT WHEN LOUD RUMBLE OCCURRED AND PRESSURIZATION BEGAN =- 500 - 1000 FPM RATE OF CLIMB AND DESCENT.  AIRCRAFT RETURNED TO ABQ.  NOISE AND RUMBLE REMAINED UNTIL PRESS RESET FOR LANDING.  INSPECTED A/C DOORS AND SEALS, OUTFLOW VALVE AND LUBRICATED EQUIPMENT COOLING FAN FLOW CONTROL VALVE.  PERFORMED PRESSURIZATION FUNCTION CHECK, OPS CHECK NORMAL.

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