# SDR WIB2002F00003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 26, 2002
- Submitted: May 29, 2002
- Operation: Air carrier
- Aircraft: N78PR
- Make and model: Lear 31A
- Registry model: [Lear 31A](https://openairdocs.org/model/learjet-31a) (OpenAirDocs)
- Aircraft serial: 090
- Engine: Garrtt TFE731*
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Relief Valve
- Part number: 660020756
- Part serial: 33A0112
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/WIB2002F00003

## Discrepancy

AIRCRAFT WOULD OPEN SAFETY VALVE AT 9.4, FOUND PRESSURE DIFFERENTIAL RELIEF VALVE OPENING TOO SOON.

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