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Dreviator · 1st February 2009, 00:23

A tech rep from Bell Helicopter came and looked at the aircraft. After several checks and isolating the Main drive shaft Vibration. It was realized that the rotor brake disc was warped. That has gotten rid of the high frequency vibration throughout the airframe. The aircraft has subsequently smoothed out a bit. I only experience a slight lateral vibration in the 60 kts letdown.

1st February 2009, 00:23	#262 (permalink)
Dreviator Probationary PPRuNer Join Date: Jan 2009 Location: Jamaica Age: 29 Posts: 2	412EP MR track and balance A tech rep from Bell Helicopter came and looked at the aircraft. After several checks and isolating the Main drive shaft Vibration. It was realized that the rotor brake disc was warped. That has gotten rid of the high frequency vibration throughout the airframe. The aircraft has subsequently smoothed out a bit. I only experience a slight lateral vibration in the 60 kts letdown.