# SDR 2013FA0000439

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 18, 2013
- Submitted: August 9, 2013
- Operation: General aviation
- Aircraft: N4129M
- Make and model: Diamon DA 42
- Registry model: [Diamon DA 42](https://openairdocs.org/model/diamond-aircraft-ind-da-42) (OpenAirDocs)
- Aircraft serial: 42AC068
- Engine: Lyc IO360M1A
- Propeller: Mtprop MTV12B
- System (JASC): [6123 · Propeller Feathering/Reversing](https://openairdocs.org/jasc/6123)
- Part: Switch
- Part number: C612461101001
- Condition: Faulty
- Location: Prop
- Part time: 3,042 hours
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2013FA0000439

## Discrepancy

PROPELLER FEATHERING SYS MALFUNCTIONED ON RT ENGINE.  COULD NOT BE UNFEATHERED. SUSPECT MICROSWITCH LOCATED IN THROTTLE QUADRANT ASSY.

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