# SDR AALA201811209014

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 19, 2018
- Submitted: November 20, 2018
- Operation: Air carrier
- Aircraft: [N803NN](https://openairdocs.org/aircraft/N803NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29566
- Aircraft time: 29,304 hours, 11,597 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Pressure Switch
- Condition: Faulty
- Location: Apu Oil System
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201811209014

## Discrepancy

DURING CRUISE, WITH THE NR 1 INTEGRATED DRIVE GENERATOR ON MEL,  LOW OIL PRESSURE LIGHT ILLUMINATED WITH AN APU AUTO SHUTDOWN,  LEAVING TWO A/C ELECTRICAL SOURCES INOPERATIVE.  DECLARED AN EMERGENCY AND DIVERTED WITHOUT FURTHER INCIDENT.  THE AIRCRAFT WAS GROUNDED.  REPLACED THE APU LOW OIL PRESSURE SWITCH IAW AMM 49-94-22.  OPS CHECKED GOOD.

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