What signifies a steady-state spin?

A steady-state spin is characterized by a condition where the aircraft is in a stabilized, continuous spin. In this state, the aerodynamic forces acting on the aircraft are in balance, and there is no further increase in the rate of descent or rotational rate unless additional inputs are made.

Loss of control authority is indicative of this condition because it points to the inability to recover or alter the aircraft's flight path effectively. During a steady-state spin, conventional control inputs may have little to no effect on changing the aircraft’s attitude or stopping the spin. This is a critical aspect of understanding spins, as it highlights the nature of control dynamics during such an event.

The other options refer to various flight situations that do not align with the definition of a steady-state spin. Minimal altitude loss and increased airspeed would suggest the aircraft is not fully in a steady-state spin, as either condition would indicate a change in flight state rather than a sustained spin. Controlled recovery inputs, while important for addressing a spin, signify active attempts to regain control rather than the stable, unchanging state that defines a steady spin.