What was found
UPON INSTALLATION OF MAIN ROTOR TRANSMISSION - EXCESSIVE VERTICAL PLAY WAS NOTED. UPON WITHDRAWL OF ROTOR MAST FROM GEARBOX FOR SPACER TUBE INSPECTION, A CRACK WAS NOTED ON ROTOR SHAFT. VERIFIED BY VISUAL 10 POWER MAGNIFICATION.
- Difficulty date
- June 6, 2012
- Submitted
- June 7, 2012
- Operation
- General aviation
- Filed by
- 2A6R933B
Air Methods, LLC - Aircraft
- N117UC
- Make and model
- Bolkms BK117B1
- Aircraft serial
- 7203
- Aircraft time
- 8,963 hours, 46,082 cycles
- System (JASC)
- 6230 · Main Rotor Mast/Swashplate
- Part
- Rotor Shaft
- Part number
- 4639205016
- Part serial
- 2995
- Condition
- Cracked
- Location
- Main Rotor
- Part time
- 5,915 hours
- Component
- Transmission · Bolkms
- Component part number
- 1171200501H10
- Stage of operation
- IN
- How discovered
- W
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.