Advancing Blade
That half of
the rotor disc in which the rotation of the blade is moving in the
same direction as the movement of the helicopter. If the helicopter
is moving forward, the advancing blade will be in the right half of
the rotor disc; if moving backward, it will be in the left half; if
moving sideward to the left, it will be in the forward half; and if
moving sideward to the right, it will be in the rear
half.