# SDR 3117705162004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 16, 2004
- Submitted: May 24, 2004
- Operation: Air carrier
- Aircraft: N132FX
- Make and model: Lear 31
- Registry model: [Lear 31](https://openairdocs.org/model/learjet-31) (OpenAirDocs)
- Aircraft serial: 31177
- Aircraft time: 3,205 hours, 7,286 cycles
- Engine: Garrtt TFE7312B
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Valve
- Part number: 26195009
- Part serial: 1AR2
- Condition: Failed
- Location: Cabin Pressure
- Part time: 3,205 hours, 7,286 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/3117705162004

## Discrepancy

AT FL390, CABIN DOOR BEGAN TO SQUEAL. AT FL405, CABIN BEGAN TO CLIMB 1,500 TO 2,000 FPM. CREW REQUESTED LOWER ALTITUDE FROM LAX ATC BUT WERE DENIED.  AT THAT POINT, CREW DECLARED AN EMERGENCY DUE TO INABILITY TO CONTROL CABIN PRESSURE. AIRCRAFT LANDED WITHOUT INCIDENT. CURRENTLY IN MX.  DOOR SEAL FOUND TO HAVE SEVERE TEAR AND THE MOD VALVES HAVE A HIGH LEAK RATE. REPLACED THE FOLLOWING PARTS DUE TO SUSPECTED FAILURE: CABIN DOOR SEAL, LT 3 WAY VALVE, LT AND RT MIXING VALVE. F/T OF PRESSURIZATION SYSTEM NORMAL.

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