Service difficulty report · Duplex Bearing · Bell 407

Difficulty date
September 13, 2012
Submitted
September 14, 2015
Operation
General aviation
Make and model
Bell 407
Engine
Allsn 250C47B
Part
Duplex Bearing
Part number
407340032101
Condition
Making Metal
Location
M/R Transmission
Component
Transmission
Component part number
407040006107
Stage of operation
IN
How discovered
9
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) MAIN TRANSMISSION MAKING METAL FOUND EVIDENT IN TRANSMISSION FILTER AND SUMP CHIP PLUG. TRANSMISSION REPLACED AND SENT TO O/H FOR EVALUATION. TRANSMISSION TEAR DOWN REPORT INDICATES DUPLEX BEARING, PN 407-340-032-101, SN ZV10283-B HAS 2 SPALL MARKS ON THE OUTER RACE.

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