What was found
UPON DISASSEMBLY OF GEARBOX DUE TO CHIP LIGHT. NR 4 BEARING FAILURE. TOOTH MISSING FROM GEAR ON PINION GEAR, AND DAMAGED GEAR TEETH ON T/M GEAR.
- Difficulty date
- October 3, 2001
- Submitted
- November 27, 2001
- Operation
- Air carrier
- Aircraft
- N497AL
- Make and model
- Bell 407
- Aircraft serial
- 53172
- Engine
- Allsn 250C47B
- System (JASC)
- 7260 · Turbine Engine Accessory Drive
- Part
- Bearing
- Part number
- 23066678
- Part serial
- JJ00454
- Condition
- Failed
- Location
- Gearbox
- Part time
- 4,254 hours
- Component
- Gearbox · Allsn · C47B
- Component part number
- 23063393
- Stage of operation
- NR
- How discovered
- O
- Nature of condition
- J
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.