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Aircraft Maintenance TroubleShoot > Helicopter Main Rotor

2:1 Vibrations in hover or forward flight

1. Mast misaligned. Adjust sprag mounts.
2. Excessive play in sprag mounting. Replace worn parts. Preload lateral sprag rods.
3. Elevator buffeting. Adjust elevator cable tension.

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Disclaimer: sacskyranch.com contains abundant information relating to aircraft maintenance. The information provided is not intended to supercede or supplement the F.A.A. approved maintenance and/or operator’s manuals. Those F.A.A. approved manuals must be utilized when performing maintenance and/or operating aircraft.