# SDR 2010FA0000746

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 19, 2010
- Submitted: July 19, 2010
- Operation: General aviation
- Aircraft: [N70HC](https://openairdocs.org/aircraft/N70HC), registered now
- Make and model: Beech A36
- Registry model: [Beech A36](https://openairdocs.org/model/beech-a36) (OpenAirDocs)
- Aircraft serial: E3172
- Aircraft time: 400 hours
- Engine: Cont IO550B
- Engine time: 400 hours
- System (JASC): [7210 · Turbine Engine Reduction Gear](https://openairdocs.org/jasc/7210)
- Part: Bevel Gear
- Condition: Chipped
- Location: Engine
- Part time: 400 hours
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2010FA0000746

## Discrepancy

ALTERNATOR FAILURE IN FLIGHT.  NORMAL LANDING. UPON REMOVAL OF ALTERNATOR BY MX, (FRT MOUNT, DIRECT DRIVE ALTERNATOR) FOUND ALTERNATOR DRIVE GEAR INSIDE ENGINE TO BE DAMAGED (GEAR TEETH CHIPPED, AND "ARC'ED LOOKING") NO SIGNS OF DAMAGE TO THE "DRIVEN" (ALTERNATOR) GEAR. ALTERNATOR FAILURE WAS AN ELECTRICAL FAILURE (OPEN STATOR WINDINGS) NOT MECHANICAL (IE: NO BRG FAILURE OR SHAFT FAILURE). UNKNOWN IF DAMAGE OCCURED FROM THIS ALTERNATOR OR PREVIOUSLY. NO RECORD OF PREVIOUS ALTERNATOR REPLACEMENT.  ALL TIMES LISTED ARE SINCE NEW, NOT O/H OR REPAIR OR INSP.

---
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.