# SDR BSYA2009063

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 25, 2009
- Submitted: January 4, 2010
- Operation: Air carrier
- Aircraft: N39DK
- Make and model: Lear 35A
- Registry model: [Lear 35A](https://openairdocs.org/model/gates-learjet-35a) (OpenAirDocs)
- Aircraft serial: 480
- Aircraft time: 22,271 hours, 21,529 cycles
- System (JASC): [7931 · Engine Oil Pressure](https://openairdocs.org/jasc/7931)
- Part: Pressure Switch
- Part number: P22B12
- Condition: Failed
- Location: Lt Engine
- Part time: 22,271 hours, 21,529 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/BSYA2009063

## Discrepancy

AFTER TAKEOFF AT 15,000 FT THE LEFT ENGINE OIL-PRESSURE LIGHT CAME ON, GAUGE READ NORMAL PRESSURE, PILOT ELECTED TO RETURN TO BASE.  MAINTENANCE REMOVED AND REPLACED DEFECTIVE OIL PRESSURE SWITCH, OPS CHECKS GOOD.

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