What was found
IN CRUISE FLIGHT THE AIRCRAFT EXPERIENCED A RHYTHMIC BUT INTERMITTENT VIBRATION. MAINTENANCE FOUND ONE OIL COOLER BLOWER TO HAVE BAD BEARINGS AND CHIPPED BLADES. REPLACED OIL COOLER BLOWER.
- Difficulty date
- July 1, 2007
- Submitted
- July 2, 2007
- Operation
- Air carrier
- Aircraft
- N412SM
- Make and model
- Bell 412
- Aircraft serial
- 33197
- Aircraft time
- 4,350 hours
- Engine
- Pwa PT6*
- System (JASC)
- 7921 · Engine Oil Cooler
- Part
- Bearing
- Condition
- Failed
- Location
- Cooler Blower
- Component
- Blower
- Component part number
- 212062514101
- Stage of operation
- CR
- How discovered
- O
- Nature of condition
- E
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.