# SDR CHIA202407187623

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 18, 2024
- Submitted: July 20, 2024
- Operation: Air carrier
- Aircraft: [N235CH](https://openairdocs.org/aircraft/N235CH), registered now
- Make and model: Boeing 234
- Registry model: [Boeing 234](https://openairdocs.org/model/boeing-vertol-234) (OpenAirDocs)
- Aircraft serial: MJ002
- Aircraft time: 9,592 hours
- Engine: Lyc AL5512
- System (JASC): [7600 · Engine Controls](https://openairdocs.org/jasc/7600)
- Part: Control Box
- Part number: BCK121
- Part serial: 024
- Condition: Activation Error
- Location: Nr 1 Engine
- Stage of operation: TO
- How discovered: O
- Nature of condition: O
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CHIA202407187623

## Discrepancy

THREE MINS AFTER TAKEOFF, THE COPILOT NOTED A SPLIT IN TORQUE SHOWING THE #1 ENGINE HAD ROLLED BACK TO 40% TORQUE. THE ENGINE WAS BEEPED UP AND THE AIRCRAFT WAS RETURNED TO BASE. TROUBLESHOOTING FOUND NO DEFECTS NOTED. FOR PRECAUTIONARY MEASURES, REPLACED #1 ENGINE N2 ACTUATOR AND N2 CONTROL BOX.

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