What was found
UPON DISASSEMBLY OF GEARBOX DUE TO CHIP LIGHT. FOUND EXCESSIVE GALLIN ON PINION AND T/M GEARS. T/M GEAR HAD ROUGH EDGES CAUSING PINION GEAR TO GALL. ASSURE PROPER MACHINING AND MESHING OF GEAR TEETH AT FACTORY.
- Difficulty date
- May 8, 2002
- Submitted
- September 4, 2002
- Operation
- Air carrier
- Aircraft
- N647AL
- Make and model
- Bell 407
- Aircraft serial
- 53357
- Engine
- Allsn 250C47B
- System (JASC)
- 7210 · Turbine Engine Reduction Gear
- Part
- Pinion Gear
- Part number
- 6893672
- Part serial
- NN77164
- Condition
- Failed
- Location
- Gearbox
- Part time
- 1,675 hours
- Component
- Gearbox · Allsn
- Component part number
- 23063393
- 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.