# SDR 97ZZZX1387

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 19, 1997
- Submitted: March 26, 2000
- Operation: General aviation
- Make and model: Bolkms BK117C1
- System (JASC): [6520 · Tail Rotor Gearbox](https://openairdocs.org/jasc/6520)
- Part: Bearing
- Part number: 4639310012
- Condition: Damaged
- Location: T/R Gearbox
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97ZZZX1387

## Discrepancy

BEARING WAS INSTALLED ON GEARSHAFT, P/N 4639311043 MMIR FORM NR 78853B, AND GEAR WAS FOUND BAD.  BEARING WAS DAMAGED DURING REMOVING IAW BK117REM305 AND MUST BE REPLACED.

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