Definition
A rule-of-thumb technique for leveling off from a climb or descent in which the pilot begins the pitch change approximately 50 feet before reaching the target altitude, allowing the aircraft's momentum and the gradual pitch transition to arrive smoothly at altitude rather than overshooting it.
Plain English
Start leveling out about 50 feet before you reach the altitude you're aiming for, so the airplane settles onto the target altitude smoothly instead of blowing through it.
Context Anchor
Used during instrument climbs and descents when the pilot is about to capture an assigned or selected altitude.
Derivation
Here, “lead” comes from the idea of guiding or going ahead of something. In flying, a lead is an early action taken before the exact point where the final result is wanted.
Why Pilots Care
Prevents altitude overshoots that can violate assigned altitudes or create traffic conflicts.
Intuition Check
Do not read “lead” as being in front of another airplane or as the metal. Here it means an early allowance: starting the level-off before the altitude you want.
Example Sentence 1
Climbing through 4,950 feet toward an assigned altitude of 5,000, the pilot used the 50-foot lead and began lowering the nose to level off.
Example Sentence 2
On descent the crew used a 50-foot lead so the aircraft leveled smoothly at the published step-down altitude.