Definition
A spin in which the airplane's longitudinal axis is at or near horizontal to the ground, with the nose flat rather than steeply pitched down. In a flat spin, the airplane rotates about a vertical axis at a low descent rate but with high yaw rate, and the wings remain stalled. Recovery is often difficult or impossible because the rudder and elevator may be blanketed by the wings and fuselage, leaving the pilot with little or no control authority to stop the rotation or break the stall.
Plain English
A spin where the airplane is rotating while lying nearly flat instead of pointing nose-down. Because of how the air flows over a flat-spinning airplane, the controls often stop working well enough to recover, which is why this kind of spin is so dangerous.
Context Anchor
Seen in spin awareness, spin recovery, and aircraft loading discussions, especially when the handbook warns about improper loading or delayed recovery.
Derivation
Flat' here describes the airplane's attitude relative to the horizon — the nose is not pitched down as it is in a normal (upright) spin. The airplane is spinning in a roughly flat, horizontal posture rather than a steep, nose-low one.
Why Pilots Care
Flat spins often require specific recovery inputs and can become unrecoverable in some aircraft, raising the risk of an uncontrolled descent.
Grounding Statement
Picture the airplane falling while rotating, with the nose held higher than expected instead of pointing clearly down.
Intuition Check
Flat does not mean the airplane is safe, level, or flying normally. Here, flat means the airplane’s attitude is flatter during the spin while it is still stalled and descending.
Example Sentence 1
Loading baggage beyond the aft CG limit increases the risk of entering a flat spin from which recovery may not be possible.
Example Sentence 2
Recognizing the flat spin by the rapid yaw and level attitude, the pilot applied opposite rudder and forward stick to recover.