# SDR CALA2025072106771

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 20, 2025
- Submitted: July 21, 2025
- Operation: Air carrier
- Aircraft: [N17753](https://openairdocs.org/aircraft/N17753), registered now
- Make and model: Boeing 737724
- Aircraft serial: 30463
- Aircraft time: 69,351 hours, 26,963 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Unknown
- Condition: Odor
- Location: Cabin
- Stage of operation: TX
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2025072106771

## Discrepancy

APU DISCONNECTED ON ITS OWN. FOLLOWED BY BURNING SMELL IN CABIN COCKPIT PERFORMED INSPECTION PER AMM 05-51-26. NO DEFECTS NOTED. ALSO PERFORMED INSPECTION OF APU PER FIM 49-55 TASK 802. NO DEFECTES NOTED EITHER. RAN APU WITH BOTH PACKS. NO BURNING SMELL OR ODORS NOTED.

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