# SDR 2021FA0000365

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2021
- Submitted: December 7, 2021
- Operation: General aviation
- Aircraft: [N81MP](https://openairdocs.org/aircraft/N81MP), registered now
- Make and model: Cessna 182R
- Registry model: [Cessna 182R](https://openairdocs.org/model/cessna-182r) (OpenAirDocs)
- Aircraft serial: 18268520
- Aircraft time: 9,980 hours
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: None
- Condition: None
- Component: Coil Cord
- Component part number: CA393424
- Stage of operation: AP
- How discovered: V
- Nature of condition: S
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2021FA0000365

## Discrepancy

ELECTRIC TRIM ACTIVATION WAS KEYING RADIO AND PRESSING PTT SWITCH WAS DISCONNECTING AUTOPILOT. THE YOKE COIL CORD INSULATION WAS FALLING OFF OF 2 ADJACENT WIRES ALLOWING THE 2 CONDUCTORS TO TOUCH AND SHORT CIRCUIT. THE COIL CORD IS A CYGNET CA3934-24 INSTALLED 2 YEARS AGO WITH A GARMIN GFC600 INSTALLATION. THIS IS THE 2ND OCCURRENCE WE’VE SEEN WITH THE FAILED INSULATION ON CYGNET CA3934-24 COIL CORD AFTER BEING INSTALLED FOR 2 YEARS.

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