Service difficulty report · Bearing · Bolkms BO105S

Difficulty date
January 23, 2007
Submitted
May 1, 2007
Operation
General aviation
Make and model
Bolkms BO105S
Aircraft time
7,370 hours
Engine
Allsn 250C20B
Part
Bearing
Part number
601741
Condition
Fractured
Location
Pendulum Absorb
Component
Pendulum Absorb
Component part number
10581022
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) UPON LANDING AT THE MAINTENANCE BASE AND FOLLOWING HELICOPTER BEING SHUTDOWN, THE PILOT WAS EXITING AND LEAVING THE AIRCRAFT HE NOTICED THAT THE M/R PENDULUM ABSORBER ON THE YELLOW MAIN ROTOR BLADE WAS IN THE HORIZONTAL POSITION. CLOSER INSPECTION REVEALED THAT WHEN AN ATTEMPT TO ROTATE THE PENDULUM ABSORBER IT WAS EXTREMELY ROUGH AND DIFFICULT TO ROTATE. PENDULUM ABSORBER WAS REMOVED AND DISASSEMBLED, WHERE IT WAS FOUND THAT ONE OF THE BEARINGS HAD A FRACTURED OUTER CASE. THE BEARING APPEARED TO BE DRY, AS NO EVIDENCE OF LUBRICATION WAS FOUND. NEW BEARINGS, SEALS, AND O-RINGS WERE INSTALLED. PENDULUM ABSORBER WAS RE-INSTALLED AND AIRCRAFT NOW RETURNED TO SERVICE. (TC NR 20070125004)