Service difficulty report · Bearing · Robsin R44RAVENII

Difficulty date
December 13, 2018
Submitted
December 13, 2018
Operation
General aviation
Make and model
Robsin R44RAVENII
Aircraft serial
10916
Aircraft time
2,267 hours
Engine
Lyc IO540AE1A5
Engine time
2,267 hours
Part
Bearing
Part number
6015LU
Condition
Corroded
Location
M/R Gearbox
Part time
67 hours
Component
Gearbox
Component part number
C0067
Stage of operation
NR
How discovered
9
Nature of condition
O
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

OUT OF BOX FAILURE OF UPPER BEARING IN MAIN ROTOR GEARBOX TOTAL TIME 67 HOURS AND CALENDAR TIME OF 18 MONTHS SINCE MANUFACTURE. APPEARS TO BE CONTAMINATION OF GREASE IN THE BEARING BY PRIMER OR PAINT CAUSING CORROSION AND LUBRICATING GREASE FAILURE WITH POSSIBLE CATASTROPHIC FAILURE, PHOTO EVIDENCE AVAILABLE ON REQUEST. DISCOVERED DURING REMOVAL OF MAIN ROTOR BLADES FOR RETURN TO RHC DUE TO OUT OF BOX CORROSION WARRANTY ISSUES.