What was found
DURING MAIN TRANSMISSION OIL CHANGE, MAINTENANCE DETECTED OIL WAS CONTAMINATED. FURTHER EVALUATION REVEALED INTERNAL CORROSION DUE TO WATER INTRUSION.
- Difficulty date
- August 27, 2021
- Submitted
- August 27, 2021
- Operation
- General aviation
- Filed by
- QR9R369D
M1 Support Services - Make and model
- Bolkms BK117C2
- Aircraft serial
- 10721309354
- Aircraft time
- 2,309 hours
- System (JASC)
- 6320 · Main Rotor Gearbox
- Part
- Transmission
- Part number
- B632K1001051
- Part serial
- KA0963
- Condition
- Contaminated
- Location
- Main Rotor
- Part time
- 2,309 hours
- Stage of operation
- IN
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.