Definition
A power-and-pitch control technique in which the pilot adjusts the throttle (and pitch as needed) before the airspeed indicator reaches the desired value, so that by the time the aircraft stabilizes, the airspeed settles exactly on target. Because the airplane and engine respond gradually, control inputs must be made in anticipation of the desired airspeed rather than in reaction to it.
Plain English
Make your power change a little early, just before the airspeed reaches the number you want. The airplane takes a moment to settle, so if you wait until you see the target speed, you'll overshoot it.
Context Anchor
Used in instrument flying when changing power or pitch to reach and hold a target airspeed.
Derivation
Lead here is used in the same sense a hunter 'leads' a moving target — aiming ahead of where it is now, because by the time the action takes effect, the target will have moved. Applied to airspeed, you act ahead of the indication.
Why Pilots Care
Prevents airspeed excursions and supports precise control during instrument approaches and maneuvers.
Analogy
It is like easing off the gas before your car reaches the speed limit, instead of waiting until you are already going too fast.
Intuition Check
Lead does not mean to pull the airplane through the air or force the airspeed to change instantly. Here it means to anticipate the change and act slightly early.
Example Sentence 1
Slowing from cruise to approach speed, the pilot began reducing power early to lead the airspeed and avoid overshooting the target.
Example Sentence 2
During the level-off from descent, lead the airspeed to avoid exceeding the target and needing large corrections.