# SDR HEEA0016715

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 6, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N911HM
- Make and model: Bolkms BO105S
- Aircraft serial: S683
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Ring Gear
- Part number: 4619304033
- Condition: Cracked
- Location: M/R Gearbox
- Component: 4638001004
- 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/HEEA0016715

## Discrepancy

MAKING METAL.  FOUND RING GEAR CRACKED AT ALIGNMENT BOLT HOLE FORWARD POSITION.  ALSO FOUND COLLECTOR WHEEL, SUNGEAR , 2 EACH INTERMEDIATE SHAFT, 5 EACH PLANETARY GEARS SPALLING.   REPAIRED TRANSMISSION AND INSTALLED SERVICEABLE PARTS.

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