Service difficulty report · Bearing

Difficulty date
August 22, 1996
Submitted
March 26, 2000
Operation
General aviation
Engine
Pwa PW120
Part
Bearing
Part number
310703301
Condition
Spalled
Location
Red Grbox Nr 15
Part time
9,176 hours
Stage of operation
IN
Nature of condition
O
Precautionary procedure
K

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

What was found

(CAN) THE REDUCTION GEARBOX WAS FOUND TO HAVE METAL FLAKES OF BEARING MATERIAL ON THE CHIP DETECTOR. THE SOURCE OF THE METAL CONTAMINATION WAS FOUND TO BE THE #15 BEARING WHICH HAD SPALLED BADLY ON THE OUTER RACE WITH SUBSTANTIAL MATERIAL LOSS. THIS WAS A RESULT OF ELECTRICAL EROSION PITTING, WHICH WAS ALSO FOUND ON THE #19 BEARING.