Service difficulty report · Bearing · Bell 407

Difficulty date
May 12, 2002
Submitted
June 10, 2002
Operation
Air carrier
Aircraft
N577AL
Make and model
Bell 407
Aircraft serial
53247
Engine
Allsn 250C47B
Part
Bearing
Part number
6895007
Part serial
JJ16688
Condition
Galled
Location
Tm Bearing
Part time
682 hours
Component
Gearbox · Allsn
Component part number
23063393
Stage of operation
IN
How discovered
V
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

ENGINE WAS REMOVED DUE TO CHIP LIGHT. GEARBOX WAS DISASSEMBLED TO FIND SOURCE OF METAL. UPON REMOVAL OF T/M JOURNAL AND INNER RACE FOUND EXCESSIVE GALLING, CAUSING METAL CONTAMINATION. ASSURE BEARINGS AND INNER RACE CAN WITH STAND HIGH LOADING CAPACITY.

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