# SDR CA040330001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 26, 2004
- Submitted: July 22, 2004
- Operation: General aviation
- Make and model: Dhav DHC8301
- Engine: Pwa PW123
- Propeller: Hamstd 14SF23
- System (JASC): [6197 · Propeller/Propulsor System Wiring](https://openairdocs.org/jasc/6197)
- Part: Wire
- Condition: Chafed
- Location: Prop Feather
- Stage of operation: CL
- How discovered: O
- Nature of condition: E
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA040330001

## Discrepancy

(CAN) AN OPERATOR CARRIED OUT AN UNSCHEDULED LANDING DUE TO UNCOMMANDED NR 2 PROPELLER FEATHER DURING CLIMB, AND SUBSEQUENT OVERTORQUE OF THE NR 2 ENGINE. THEY FOUND THE CAUSE OF THIS PROBLEM WAS: CHAFING OF SEVERAL WIRES (HYDRAULIC SYSTEM, PROPELLER AUTOFEATHER SYSTEM, AND GALLEY ELECTRICAL POWER) ON A BRACKET IN THE RT WINGROOT CAUSED A 'MIXTURE' OF 28VDC AND 115VAC IN THESE SYSTEM, AND SUBSEQUENT MALFUNCTION OF THE NR 2 PROP AUTOFEATHER SYSTEM. THE AFFECTED BRACKET IN THE RT REAR WINGROOT HAS P/N 85350711-001.

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