Definition
Aileron input applied in the direction opposite to the airplane's bank or roll tendency, used to control or counteract an unwanted rolling motion. In maneuvers such as the lazy eight, opposite aileron pressure is progressively applied as the airplane reaches steep bank angles and slow airspeeds to prevent the bank from increasing further due to the overbanking tendency.
Plain English
Pushing the control wheel or stick the other way from the direction the airplane is rolling, to stop it from rolling further. If the airplane is banking left and wants to keep banking more steeply, you apply right aileron pressure to hold the bank where you want it.
Context Anchor
Used during maneuvers such as the lazy eight, where the airplane is smoothly changing pitch, bank, and direction.
Derivation
Aileron comes from a French word meaning “little wing.” That helps because an aileron is the small movable part on the wing that helps roll the airplane left or right. Pressure here means the pilot’s control force, not air pressure.
Why Pilots Care
Prevents excessive bank angles that would disrupt coordination, altitude control, or airspeed management during the maneuver.
Intuition Check
Opposite does not mean a sudden or harsh correction. It means a smooth control input against the roll or bank you need to slow, stop, or reverse.
Example Sentence 1
As the airplane approached 90 degrees of turn in the lazy eight, the instructor reminded the student to apply opposite aileron pressure to keep the bank from steepening.
Example Sentence 2
Slight opposite aileron pressure on the descending side keeps both halves of the Lazy Eight symmetrical.