Definition
A maximum-performance, gliding turn maneuver in which the airplane descends through a series of constant-radius turns at a constant airspeed, typically at least three full 360-degree turns around a fixed point on the ground, while compensating for wind to maintain a uniform spiral path.
Plain English
A practice maneuver where the pilot pulls the power back and glides down in tight, even circles around a point on the ground, adjusting the bank angle as the wind changes so each loop stays the same size.
Context Anchor
Encountered in airplane maneuver training and in discussions about controlling descent rate and avoiding an uncontrolled steepening turn.
Derivation
Steep' refers to the bank angle, which can reach up to 60 degrees on the downwind side. 'Spiral' comes from the Latin 'spira' (a coil or twist), describing the descending corkscrew path the airplane traces through the air.
Why Pilots Care
Enables rapid, controlled altitude reduction in emergencies such as engine failure while remaining near a landing site or safe area.
Intuition Check
Do not read “steep spirals” as simply “turning sharply.” In aviation training, it means a planned descending turn where the pilot is still controlling airspeed, wing tilt, and path.
Example Sentence 1
During the checkride, the examiner asked the applicant to demonstrate steep spirals over a road intersection, holding best glide speed throughout the descent.
Example Sentence 2
During the emergency descent drill the pilot used steep spirals to stay within gliding distance of the runway.