Service difficulty report · Bearing · Bell 407

Difficulty date
June 29, 2010
Submitted
January 4, 2011
Operation
Air carrier
Make and model
Bell 407
Aircraft time
556 hours
Engine
Allsn 250C47B
Part
Bearing
Part number
6871505
Condition
Making Metal
Location
Nr 5
Part time
817 hours
Stage of operation
TX
How discovered
O
Nature of condition
J
Precautionary procedure
E

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

What was found

THE PILOT WAS STARTING THE ENGINE AND AT IDLE GOT A WARNING OF A ENGINE CHIP LIGHT. THE ENGINE WAS SHUTDOWN AND THE ENGINEER VIEWED THE CHIP PLUGS. THERE WAS FERROUS METAL ON BOTH PLUGS MORE ON THE BOTTOM CHIP PLUG. THE TURBINE WAS REMOVED AND SENT TO A APPROVED ENGINE SHOP. AFTER DISASSEMBLY, THE METAL GENERATED WAS FOUND TO BE FROM THE NR5 BRG. THE PN OF THE NR5 BRG IS 6871505 TSN 817.

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