# SDR 2012FA0000467

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 5, 2012
- Submitted: July 11, 2012
- Operation: General aviation
- Aircraft: [N291B](https://openairdocs.org/aircraft/N291B), registered now
- Make and model: Beech B300B350C
- Aircraft serial: FL559
- Aircraft time: 1,226 hours, 979 cycles
- System (JASC): [2460 · DC Power Distribution System](https://openairdocs.org/jasc/2460)
- Part: Buss
- Condition: Damaged
- Stage of operation: TX
- How discovered: V
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2012FA0000467

## Discrepancy

WHEN THE BATTERY SWITCH WAS MOVED TO THE "ON" POSITION, ELECTRICAL POWER WAS BEING APPLIED TO THE LT GENERATOR BUSS WITH THE BUSS TIES OPEN.  LT GENERATOR BUSS SHOULD ONLY HAVE POWER WHEN THE BUSS TIES ARE CLOSED.  FOUND THE RT CIRCUIT BREAKER PANEL TRIPLE FED BUSS LINK (W50) WAS MAKING CONTACT WITH THE LT GENERATOR BUSS LINK (W49).  THEREFORE SUPPLYING POWER FROM THE TRIPLE FED BUSS TO THE LT GENERATOR BUS AS SOON AS THE BATTERY SWITCH WAS TURNED ON.

---
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.