Dynamic Rollover (helicopter Operation)

The tendency of a helicopter to roll over on landing. If one gear is on the ground and the helicopter pivots around that point, it will continue to roll when a critical angle is exceeded.
A helicopter is susceptible to a rolling tendency, called dynamic rollover, when close to the ground, especially when taking off or landing. For dynamic rollover to occur, some factor has to first cause the helicopter to roll or pivot around a skid, or landing gear wheel, until its critical rollover angle is reached. Then, beyond this point, main rotor thrust continues the roll and recovery is impossible. If the critical rollover angle is exceeded, the helicopter rolls on its side regardless of the cyclic control corrections made.