Definition
The amount of lift a wing is able to produce at a given airspeed and angle of attack. It depends on the smooth, designed shape of the wing's airfoil, which causes air to flow over and under it in a way that generates upward force. Anything that disturbs that shape — such as ice, frost, or contamination — reduces the wing's lifting power.
Plain English
How much upward force the wing can create to keep the airplane flying. If the wing's shape is changed by ice or other contamination, it can't produce as much of that force.
Context Anchor
Used in discussions of aircraft icing, especially when explaining why even a small amount of ice on the wings can make the airplane harder to control and keep flying.
Why Pilots Care
Ice reduces lifting power, raising stall speed and requiring higher angle of attack to maintain altitude.
Analogy
A clean wing is like a clean hand held out a car window at an angle: the air can push it smoothly upward. If the hand is covered with rough bumps, the air no longer flows over it cleanly, and it does not lift as well.
Grounding Statement
Picture a thin ridge of ice on the front of the wing: the wing may still look mostly normal, but the air flowing over it is no longer moving smoothly, so the wing cannot lift as well.
Intuition Check
Lifting power does not mean engine power or the airplane’s strength. Here it means the wing’s ability to create lift and keep the aircraft flying.
Example Sentence 1
Even a thin layer of frost on the wings can reduce lifting power enough to prevent a safe takeoff.
Example Sentence 2
The pilot activated the de-ice boots to restore lifting power before the stall margin became unsafe.