# SDR M36R20120114001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 14, 2013
- Submitted: January 14, 2013
- Operation: General aviation
- Aircraft: [N1037N](https://openairdocs.org/aircraft/N1037N), registered now
- Make and model: Cessna 208B
- Registry model: [Cessna 208B](https://openairdocs.org/model/cessna-208b) (OpenAirDocs)
- Aircraft serial: 208B0334
- Aircraft time: 8,916 hours, 14,045 cycles
- Engine: Pwa PT6A114A
- System (JASC): [2497 · Electrical Power System Wiring](https://openairdocs.org/jasc/2497)
- Part: Switch
- Part number: CM358930W31X1000
- Condition: Failed
- Location: Cockpit
- Stage of operation: IN
- How discovered: 9
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/M36R20120114001

## Discrepancy

PILOT REPORTED THE NR 1 AVIONICS SWITCH WAS STUCK AND THE NR 2 AVIONICS SWITCH WAS ALSO REPORTED INOPERATIVE WHEN PLACED IN THE ON POSITION.  ON INSPECTION, FOUND THAT BOTH AVIONICS SWITCHES HAD FAILED.   IT WAS ALSO LATER DETERMINED THAT THE 2 SWITCHES WERE WIRED INCORRECTLY WHEN REFERENCED TO THE WIRING DIAGRAM.  THE WIRING WAS CONFIGURED SO THAT IF THE NR 2 SWITCH FAILED THE NR 2 BUSS COULD NOT BE ENERGIZED USING THE AVIONICS BUSS TIE SWITCH.

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