A spin is the autorotation that can develop after a wing drops during a stall.
First, one wing drops after the stall has occured and as discussed previously, the dropping wing experiences a further increase in angle of attack which aggravates the stall, resulting in less lift and more drag.
The reducing lift causes the wing to drop further and the aircraft has begun to roll, while the increasing drag causes the aircraft to yaw.
As long as the wing remains stalled, the aircraft will continuously roll and yaw. Rate of descent will be very high but airspeed remains low in a spin.
To recover from a spin, the autorotation must be stopped. The pilot must apply rudder in the direction opposite the spin to stop the yaw and reduce the angle of attack to unstall the wings. The aircraft will transition out of the spin into a normal dive from which a gentle recovery to straight and level flight can be made.
PARE is often used as a spin recovery technique:
Power – Idle
Ailerons – Central
Rudder – Apply in the opposite direction to the spin
Elevator – Forward to reduce angle of attack