Definition
A piloting technique in which the pilot begins the level-off from a climb or descent before reaching the target altitude, so that the aircraft's vertical momentum carries it smoothly onto the desired altitude rather than overshooting or undershooting it. A common rule of thumb is to start the level-off at roughly 10 percent of the vertical speed prior to the target altitude (for example, begin level-off about 50 feet early when descending at 500 feet per minute).
Plain English
Start leveling off a little before you actually reach the altitude you want, so the airplane settles onto it cleanly instead of blowing through it.
Context Anchor
Used during instrument climbs and descents when leveling off at an assigned altitude or a planned cruising altitude.
Derivation
The phrase borrows from the everyday sense of 'lead' as in leading a moving target — acting ahead of where something currently is, anticipating where it will be. Here, the pilot acts ahead of the altitude itself, beginning the level-off before the altimeter reads the target.
Why Pilots Care
Prevents altitude deviations that violate ATC clearances and maintains precise vertical navigation.
Analogy
It is like easing off the gas and starting to brake before a stop sign. If you wait until you are at the sign, you will roll past it.
Intuition Check
Do not assume “lead” means to climb or descend faster. Here it means to start the level-off early so the aircraft arrives at the altitude smoothly.
Example Sentence 1
Descending at 700 feet per minute toward 5,000 feet, the pilot began to lead the altitude about 70 feet early to avoid overshooting.
Example Sentence 2
In a climb with low vertical speed, lead the altitude by 50 feet so the aircraft captures the assigned level smoothly without overshoot.