Service difficulty report · Bearing · Bell 407

Difficulty date
February 18, 2015
Submitted
February 19, 2015
Operation
General aviation
Aircraft
N443PH
Make and model
Bell 407
Aircraft serial
53421
Aircraft time
3,833 hours
Engine
Allsn 250C47B
Engine time
11,010 hours
Part
Bearing
Part number
M25010106
Part serial
NWE131392
Condition
Spalled
Location
Turbine
Part time
1,096 hours
Component
Turbine
Component part number
M25010557
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

TURBINE REMOVED 1-20-15 FOR METAL IN OIL. REMOVED NR 5 BEARING DUE TO PROBABLE SPALLING ON OUTER RACE AT SPLIT. INSPECTED BEARING AND FOUND SPALLING ON BALLS. SCRAPPED PART AND REPLACED WITH NEW. PART WILL BE RETURNED TO MFG FOR FURTHER EVALUATION.

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