# SDR 95ZZZX6205

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 15, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N491HL
- Make and model: Bolkms BO105S
- Aircraft serial: S664
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Housing
- Part number: 4619201011
- Condition: Flange Damage
- Location: M/R Gearbox
- Part time: 5,575 hours
- Stage of operation: IN
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/95ZZZX6205

## Discrepancy

DURING DISASSEMBLY, THE RIGHT OIL PASSAGE O-RING FLANGE WAS FOUND DAMAGED.  THE DAMAGE WAS OBVIOUSLY NOTED DURING LAST OVERHAUL DUE TO THE INSTALLATION OF 2 O-RINGS TO MAKE IT SEAL.

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