Dynamic rollover occurs due to a combination of which two factors?

• A. Human and physical
• B. Mechanical and aerodynamic
• C. Pilot and weather
• D. Human and environmental

Answer: (A)

Dynamic rollover happens when a rolling tendency is created and the helicopter has a pivot point on the ground that allows that roll to continue. The two factors are:

• a rolling tendency arising from human control actions (pilot input or miscontrol of cyclic/pedals),

• a physical condition that provides a pivot and supports the roll (ground contact like a skid or a slope, plus the aircraft’s weight/CG distribution).

When both occur together, the roll can become self-reinforcing: the pivot point allows the rolling motion to continue while lift on the rolling side further compounds the tilt, leading to a rapid rollover. While environmental factors like wind or surface can influence the situation, the combination highlighted here—pilot-induced roll and a physical pivot condition—is what drives dynamic rollover.