# SDR 2025FA0000075

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 31, 2025
- Submitted: January 31, 2025
- Operation: General aviation
- Aircraft: [N340SF](https://openairdocs.org/aircraft/N340SF), registered now
- Make and model: Bolkms BK117C2
- Aircraft serial: 9411
- Aircraft time: 8,483 hours, 23,596 cycles
- System (JASC): [7601 · Engine Synchronizing](https://openairdocs.org/jasc/7601)
- Part: Control Box
- Condition: Disengaged
- Location: Vartoms
- Stage of operation: DE
- How discovered: V
- Nature of condition: R
- Precautionary procedure: L
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2025FA0000075

## Discrepancy

DURING DECENT THE VARTOMS SYSTEM DISENGAGED.  CAUSING THE NUMBER 1 ENGINE TORQUE TO DECREASE.  THE PILOT WAS UNABLE TO GET THE TORQUES MATCHED MANUALLY.  ABORTED THE LANDING AND PROCEEDED TO AN AIRPORT TO PERFORM A PRECAUTIONARY LANDING.  AFTER EXTENSIVE TROUBLESHOOTING AND CONTACT WITH TECH SUPPORT, WE COULD NOT DUPLICATE THE ISSUE OR FIND ANY FAULTS WITH THE SYSTEM.

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