Service difficulty report · Bearing · Aerosp ATR42*

Difficulty date
October 5, 1995
Submitted
March 26, 2000
Operation
General aviation
Make and model
Aerosp ATR42*
Engine
Pwa PW121
Part
Bearing
Part number
310703301
Condition
Spalled
Location
Rgb Nr 15 Brg
Part time
5,634 hours
Component
Pwa
Stage of operation
NR
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)REDUCTION GEAR BOX PRODUCING METAL. #15 BARING BALLS AND OUTER RACE HEAVILY SPALLED. OTHER BEARINGS IN THE SAME GEARBOX HAD CLUSTER PITTING TYPICAL OF ELECTRICAL DISCHARGE. THE LACK OF RESIDUAL MAGNET ISM ON THE STEEL COMPONENTS MAKES IT UNLIKELY THAT THE ELECTRICAL DISCHARGE WAS DUE TO LIGHTNING STRIKE.

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