Originally Posted by
CGameProgrammerr
You guys seem to be making the mistake of thinking the tail rotor was out of balance. Nowhere in the report does it say that. Instead, the mechanics assumed the vibration might have been due to an unbalanced tail rotor so they checked its balance and found it to be within limits. Something else was obviously catastrophically wrong with the tail rotor, shaft, or gearbox, which nobody bothered to check.