What was found
ENGINE REMOVED 8-12-15 DUE TO OVERTORQUE. REPLACED TURBINE NR 5 BEARING DUE TO DEEP SCRATCHES ON BALLS AND POSSIBLE SPALLING ON BEARING OUTER RACE. INSTALLED NEW NR 5 BEARING. PART WILL BE RETURNED TO MFG FOR FURTHER EVALUATION.
- Difficulty date
- August 25, 2015
- Submitted
- August 26, 2015
- Operation
- General aviation
- Aircraft
- N490PH
- Make and model
- Bell 407
- Aircraft serial
- 53378
- Aircraft time
- 10,938 hours
- Engine
- Allsn 250C40B
- Engine time
- 2,253 hours
- System (JASC)
- 7250 · Turbine Section
- Part
- Bearing
- Part number
- M25010106
- Part serial
- NWC140170
- Condition
- Spalled
- Location
- Engine
- Part time
- 272 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.