this phase, the aerodynamic and inertial forces have not
achieved a balance. As the incipient spin develops, the
indicated airspeed should be near or below stall airspeed,
and the turn-and-slip indicator should indicate
the direction of the spin.

The incipient spin recovery procedure should be
commenced prior to the completion of 360° of
rotation. The pilot should apply full rudder opposite
the direction of rotation. If the pilot is not sure of the
direction of the spin, check the turn-and-slip indicator;
it will show a deflection in the direction of rotation.

DEVELOPED PHASE
The developed phase occurs when the airplane's
angular rotation rate, airspeed, and vertical speed are
stabilized while in a flightpath that is nearly vertical.

This is where airplane aerodynamic forces and inertial
forces are in balance, and the attitude, angles, and self sustaining
motions about the vertical axis are constant
or repetitive. The spin is in equilibrium.

RECOVERY PHASE
The recovery phase occurs when the angle of attack of
the wings decreases below the critical angle of attack
and autorotation slows. Then the nose steepens and
rotation stops. This phase may last for a quarter turn to
several turns.