# SDR 2005FA0001200

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 28, 2005
- Submitted: August 23, 2005
- Operation: General aviation
- Aircraft: [N117BK](https://openairdocs.org/aircraft/N117BK), registered now
- Make and model: Bolkms BK117B2
- Aircraft serial: 7229
- Engine: Lyc LTS101*
- System (JASC): [6520 · Tail Rotor Gearbox](https://openairdocs.org/jasc/6520)
- Part: Bevel Gear
- Part number: 4639310062
- Part serial: 862
- Condition: Cracked
- Location: T/R Gearbox
- Part time: 3,544 hours
- Component: Gearbox
- Component part number: 4639002005
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2005FA0001200

## Discrepancy

CASE CRUSHING OR SPALLING WITH CRACKS.  COMPONENT COMING DUE 3600 HR TBO.  SUBMITTED FOR ROUTINE OVERHAUL.  DEFECTS FOUND DURING NORMAL DETAIL BENCH INSPECTION.  COMPONENT HAS A 10,800 HOUR SERVICE LIFE LIMIT.  (K)

---
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.