# SDR DXTA2026012706658

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 24, 2026
- Submitted: January 27, 2026
- Operation: Air carrier
- Aircraft: [N790QS](https://openairdocs.org/aircraft/N790QS), registered now
- Make and model: Bombdr BD1001A10
- Aircraft serial: 20627
- Aircraft time: 10,797 hours, 6,295 cycles
- System (JASC): [2300 · Communications System](https://openairdocs.org/jasc/2300)
- Part: Audio Control
- Condition: Faulted
- Location: Zone 200
- Stage of operation: CR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2026012706658

## Discrepancy

AT CRUISE A VERY LOUD PULSATING ALARM SOUNDED THROUGH ALL CABIN AND GALLEY SPEAKERS. STARTED TO SMELL AN ODOR AFTER 30 MIN PRIOR TO LANDING. THE LOUD NOISE STAYED CONSTANT UNTIL SHUTTING DOWN THE AIRCRAFT.   PERFORMED OPS TEST OF THE CABIN MANAGEMENT SYSTEM. OPS CHECKED GOOD IAW SMM 44-10-00-710-801.

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