What was found
AFTER MAIN ROTOR HEAD WAS REMOVED FOR OTHER MX, THE MAST WAS FOUND TO HAVE CORROSION ON THE MATING SURFACE AND AROUND MOUNTING BORES.
- Difficulty date
- January 20, 2010
- Submitted
- January 20, 2010
- Operation
- General aviation
- Aircraft
- N156AM
- Make and model
- Bolkms BK117B1
- Aircraft serial
- 7173
- System (JASC)
- 6230 · Main Rotor Mast/Swashplate
- Part
- Mast
- Part number
- 4639205016
- Part serial
- 3170
- Condition
- Corroded
- Location
- Main Rotor
- Part time
- 3,566 hours
- Component
- Gearbox
- Component part number
- 117120061
- Stage of operation
- IN
- How discovered
- V
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.