What was found
MAIN ROTOR MAST WAS REMOVED FOR OTHER INSPECTIONS AND WAS FOUND TO HAVE FRETTING IN ZONE "G". AREA OF THE SEALING RING RUNNER FOR THE UPPER MAST SEAL.
- Difficulty date
- May 23, 2011
- Submitted
- May 24, 2011
- Operation
- Air carrier
- Aircraft
- N330SL
- Make and model
- Bolkms BK117B2
- Aircraft serial
- 7216
- Aircraft time
- 12,863 hours, 55,690 cycles
- Engine
- Lyc LTS101750B1
- System (JASC)
- 6230 · Main Rotor Mast/Swashplate
- Part
- Mast
- Part number
- 4639205016
- Part serial
- 3246
- Condition
- Worn
- Location
- Main Rotor
- Part time
- 4,426 hours
- 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.