# SDR FVJA2025120800413

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 5, 2025
- Submitted: December 8, 2025
- Operation: Air carrier
- Aircraft: [N600LY](https://openairdocs.org/aircraft/N600LY), registered now
- Make and model: Amd FALCON50MYST
- Aircraft serial: 337
- Aircraft time: 9,575 hours, 6,158 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Cooling Turbine
- Part number: 3500C01
- Part serial: 670
- Condition: Faulted
- Location: Zone 100
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: G, B, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FVJA2025120800413

## Discrepancy

DUCT TEMP OVERHEAT ANNUNCIATOR FOLLOWED BY SMOKE REPORTED IN CABIN. PERFORMED GROUND RUNS FOR TROUBLESHOOTING AND DUPLICATED PROBLEM. LOWER COOLING TURBINE  PASSENGER LOWER COOLING TURBINE PRODUCING A DUCT OVER HEAT AND SMOKE IN CABIN. SUSPECT TURBO COOLER BEARING FAILURE.

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