# SDR 2026F00115

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 20, 2026
- Submitted: May 22, 2026
- Operation: General aviation
- Aircraft: [N777ZA](https://openairdocs.org/aircraft/N777ZA), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 54626
- Aircraft time: 5,614 hours, 5,259 cycles
- Engine: Allsn 250C47B
- Engine time: 4,339 hours, 4,050 cycles
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Condition: Smoke
- Part time: 4,339 hours, 4,050 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2026F00115

## Discrepancy

THIS IS TO REPORT A NEW EVENT FOLLOWING SDR NO. 2120-0663.  THE REPAIRED ENGINE WAS TAKEN OUT OF SERVICE FOR THE ENGINE SMOKE WHEN ENGINE TRANSITIONS FROM FLY TO IDLE.  TROUBLESHOOTING WAS CARRIED OUT PER THE ROLLS ROYCE MANUAL.  NO DISCREPANCIES WERE NOTED.  THE REPAIR WAS PERFORMED BY PHI AS PREVIOUSLY NOTED.  PHI WAS NOTIFIED ABOUT THE EVENT.  THIS EVEN OCCURRED APPROXIMATELY 65 HOURS AFTER REPAIR OF A SIMILAR ISSUE DESCRIBED IN THE SDR NOTED EARLIER IN THIS DESCRIPTION.

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