Plain English Meaning

The middle part of a spin where things have settled into a steady pattern — the airplane is turning, falling, and pitching down at a roughly constant rate rather than still building up.

Full Definition

The second phase of a spin, occurring after the incipient phase, in which the airplane's angular rotation rate, airspeed, and vertical descent rate have stabilized and the flightpath has become close to vertical. In this phase the aerodynamic forces and inertia forces are in balance, and the airplane is rotating about a vertical axis at a relatively steady rate.

Context Anchor

Used in spin training and spin discussions to the stage between the initial and the .