# SDR AALA202406043169

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 3, 2024
- Submitted: June 4, 2024
- Operation: Air carrier
- Aircraft: [N803NN](https://openairdocs.org/aircraft/N803NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29566
- Aircraft time: 43,447 hours, 18,164 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Pressure Switch
- Part number: 38007022
- Condition: Faulted
- Location: Apu Oil Sys
- Component: Apu, Hnywl
- Component part number: 351A10001
- Stage of operation: NR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202406043169

## Discrepancy

AIRCRAFT WAS GROUNDED: APU WENT OFFLINE, BUT A VERY STRONG ELECTRICAL BURNING SMELL WAS IN AIRCRAFT CABIN AND FLIGHT DECK AFTER APU RESTART. ACCOMPLISHED WORK CARD 08L00021001 FOR SMOKE ODOR FUMES, FOUND OIL COOLER FAULTY. REMOVE AND REPLACED OIL COOLER (AALA202406046456), PER AMM 49-91-41. ALSO REMOVE AND REPLACED LOW OIL PRESSURE SWITCH (AALA202406043169), PER AMM 49-94-22. ALL OPERTIONAL AND LEAKED CHECK GOOD.

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