# SDR AALA202610192245

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 16, 2026
- Submitted: October 20, 2026
- Operation: Air carrier
- Aircraft: [N979AN](https://openairdocs.org/aircraft/N979AN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29568
- Aircraft time: 51,312 hours, 21,846 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Pressure Switch
- Part number: 38762552
- Condition: Inoperative
- Location: Apu Oil Press
- Stage of operation: CR
- How discovered: O
- Nature of condition: H, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202610192245

## Discrepancy

AIRCRAFT WAS GROUNDED:  --DECISION WAS MADE TO DIVERT TO GEG.  EMERGENCY DECLARED; AIRCRAFT LANDED WITHOUT INCIDENT -- APU SHUT DOWN WITH LOW OIL PRESSURE MESSAGE IN CRUISE AT FL380 TWO TIMES WHILE IT WAS BEING USED AN AN ELECTRICAL SOURCE DUE TO SOURCE 1 OFF.  BITE TEST OF APU SHOWED NUMEROUS HITS FOR OIL QUANTITY SENSOR FAULTS.  REMOVED AND REPLACED OIL QUANTITY SENSOR PER AMM 49-94-11.  AS PRECAUTIONARY ALSO REPLACED LOW OILPRESSURE SWITCH PER AMM 49-94-22.

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