# SDR ULXR2016051800001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 2, 2016
- Submitted: May 18, 2016
- Operation: General aviation
- Filed by: [City of Los Angeles-General Services, repair station ULXR905L](https://openairdocs.org/faa-repair-station/ULXR905L/city-of-los-angeles-general-services.md) (OpenAirDocs)
- Aircraft: [N303FD](https://openairdocs.org/aircraft/N303FD), registered now
- Make and model: Agusta AW139
- Registry model: [Agusta AW139](https://openairdocs.org/model/agustawestland-philadelphia-aw139) (OpenAirDocs)
- Aircraft serial: 41012
- Aircraft time: 1,330 hours
- System (JASC): [2497 · Electrical Power System Wiring](https://openairdocs.org/jasc/2497)
- Part: Contactor
- Part number: K300B5C5
- Part serial: CP70304
- Condition: Burned
- Location: Buss Tie
- Part time: 1,330 hours
- Stage of operation: HO
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ULXR2016051800001

## Discrepancy

AFTER EXECUTING SEVERAL PRACTICE HOIST EVOLUTIONS,  SMELLED A FAINT ODOR OF BURNING ELECTRICAL AND SIMULTANEOUSLY EXPERIENCED A 2 GEN FAIL WITH A BUS TIE FAIL IN THE CAS WINDOW.  THE ACFT EXPERIENCED A K10 BUSS TIE CONTACTOR FAILURE.  THIS CONTACTOR CONNECTS THE NR 1 AND NR 2 MAIN LOAD BUSES.

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