# SDR HYIA20210311002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 9, 2021
- Submitted: March 11, 2021
- Operation: Air carrier
- Aircraft: [N740CA](https://openairdocs.org/aircraft/N740CA), registered now
- Make and model: Cessna 402C
- Registry model: [Cessna 402C](https://openairdocs.org/model/cessna-402c) (OpenAirDocs)
- Aircraft serial: C4020277
- Aircraft time: 27,613 hours, 12,228 cycles
- System (JASC): [2297 · Auto Flight System Wiring](https://openairdocs.org/jasc/2297)
- Part: Wire
- Condition: Chafed
- Location: Ptt Switch
- Stage of operation: CR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/HYIA20210311002

## Discrepancy

THE PILOT REPORTED A BURNING SMELL AFTER THE AUTOPILOT CB POPPED DURING FLIGHT.  MAINTENANCE INSPECTED AND FOUND CHAFFED WIRING AT THE PTT SWITCH.  THE WIRES WERE REPAIRED WITH NO FURTHER DEFECTS NOTED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.