What was found
BUMPS OR BUBBLES WERE FOUND IN THE UPPER SHEAVE GROOVES. THESE SEEM TO BE CORROSION POCKETS BETWEEN THE METALIZED PLATING AND THE CAST ALUMINUM BASE. IF THIS CONTINUED IN SERVICE, ACCELERATED DRIVE BELT WEAR WILL OCCUR.
- Difficulty date
- April 13, 2023
- Submitted
- April 13, 2023
- Operation
- General aviation
- Aircraft
- N4377U
- Make and model
- Robsin R44
- Aircraft serial
- 12814
- Aircraft time
- 4,687 hours, 1 cycles
- System (JASC)
- 6310 · Engine/Transmission Coupling
- Part
- Sheave
- Part number
- CO185
- Part serial
- 247813460
- Condition
- Unknown
- Location
- Zone 200
- Part time
- 293 hours, 1 cycles
- Stage of operation
- UK
- How discovered
- V
- Nature of condition
- W
- Precautionary procedure
- R
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.