# SDR 123197A

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 4, 2005
- Submitted: August 4, 2005
- Operation: General aviation
- Aircraft: [N518JG](https://openairdocs.org/aircraft/N518JG), registered now
- Make and model: Lear 31A
- Registry model: [Lear 31A](https://openairdocs.org/model/learjet-31a) (OpenAirDocs)
- Aircraft serial: 219
- Aircraft time: 1,105 hours, 1,111 cycles
- Engine: Garrtt TFE731*
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 66001983
- Part serial: 12AV9
- Condition: Failed
- Location: Tailcone
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/123197A

## Discrepancy

DURING CRUISE, AIRCRAFT LOST PRESSURIZATION.  COCKPIT INDICATIONS ALERTED CREW AS DESIGNED. AIRCRAFT PRESSURIZATION AUTOMATICALLY DEFAULTED TO EMERGENCY MODE.

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