What was found
DURING ROUTINE MAINTENANCE IT WAS DISCOVERED THAT FRETTING WAS OCCURRING BETWEEN THE RING GEAR CASE AND THE UPPER CASE OF MAIN GEAR BOX. C/W TORQUE CHECK OF STUDS AND FOUND NUTS HAVE LOST TORQUE.
- Difficulty date
- May 29, 2021
- Submitted
- June 2, 2021
- Operation
- Air carrier
- Aircraft
- N823H
- Make and model
- Bell 214ST
- Aircraft serial
- 28141
- Aircraft time
- 11,836 hours
- System (JASC)
- 6320 · Main Rotor Gearbox
- Part
- Nut
- Condition
- Loose
- Location
- Transmission
- Part time
- 11,914 hours
- Component
- Transmission · Bell · 9DKA20210530
- Component part number
- 214040002115
- 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.