What was found
ENGINE REMOVED 4-9-15 FOR CHIP LIGHT ON LOWER CHIP PLUG. EXCESSIVE AMOUNT OF METAL FLAKES. CAUSE FOUND TO BE GEARBOX PTO BALL BEARING. TURBINE NR 5 BEARING REMOVED FOR POSSIBLE SPALLING AT OUTER RACE SPLIT. INSTALLED NEW NR 5 BEARING.
- Difficulty date
- April 19, 2015
- Submitted
- April 19, 2015
- Operation
- General aviation
- Aircraft
- N421PH
- Make and model
- Bell 407
- Aircraft serial
- 53749
- Aircraft time
- 8,425 hours
- Engine
- Allsn 250C47B
- Engine time
- 2,125 hours
- System (JASC)
- 7250 · Turbine Section
- Part
- Bearing
- Part number
- M25010106
- Part serial
- NWC140063
- Condition
- Spalled
- Part time
- 140 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.