What was found
AFTER INSTALLATION OF REPAIRED TAIL ROTOR ASSY, A VIBRATION CHECK AND BALANCE CHECK OF THE "SHORT SHAFT" IS REQUIRED. THE BALANCE WAS OUT BY A CONSIDERABLE AMOUNT AND AS THESE PART WERE NEVER REMOVED OR ALTERED DURING THE REPLACEMENT OF THE TAIL ROTOR ASSY, IT CAN ONLY BE ASSUMED THAT THE SHORT SHAFT WAS NOT PROPERLY BALANCED WHEN LEAVING THE FACTORY. RECOMMEND STRICTER QC ON THE BALANCING OF ROTORS BEFORE LEAVING THE MFG.