What term describes a vibration in which the movement is in the lateral direction due to main rotor imbalance?

What term describes a vibration in which the movement is in the lateral direction due to main rotor imbalance?

• A. Lateral Vibration
• B. Lead and Lag
• C. Licensed Empty Weight
• D. Night

Answer: (A)

The movement described is side-to-side, or lateral, vibration. When the main rotor has an imbalance, the heavier portion of the rotor produces a periodic sideways force as it spins. That force shows up as a vibration in the lateral direction of the aircraft, repeating at the rotor’s speed. The term lead and lag refers to the blade’s motion within the plane of rotation rather than the fuselage’s vibration direction, and Licensed Empty Weight and Night are unrelated to rotor-induced vibrations.

The movement described is side-to-side, or lateral, vibration. When the main rotor has an imbalance, the heavier portion of the rotor produces a periodic sideways force as it spins. That force shows up as a vibration in the lateral direction of the aircraft, repeating at the rotor’s speed. The term lead and lag refers to the blade’s motion within the plane of rotation rather than the fuselage’s vibration direction, and Licensed Empty Weight and Night are unrelated to rotor-induced vibrations.