# SDR 20001101SH001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 19, 2000
- Submitted: November 1, 2000
- Operation: General aviation
- Aircraft: [N718EH](https://openairdocs.org/aircraft/N718EH), registered now
- Make and model: Cessna 172R
- Registry model: [Cessna 172R](https://openairdocs.org/model/cessna-172r) (OpenAirDocs)
- Aircraft serial: 17280061
- System (JASC): [2400 · Electrical Power System](https://openairdocs.org/jasc/2400)
- Part: Master Switch
- Part number: S337711
- Condition: Malfunctioned
- Location: Instrument Panel
- Part time: 1,283 hours
- Stage of operation: IN
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20001101SH001

## Discrepancy

WHEN AVIONICS MASTER SWITCH STARTS TO FAIL, IT WILL ONLY TURN ON THE NR 1 COM.  ALL OTHER AVIONIC COMPONENTS ARE CONTROLLED BY THE BATTERY MASTER.   (X)

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