Definition
The maneuver of transitioning the aircraft from a descent back to level flight at a target altitude, accomplished by initiating the level-off before reaching the desired altitude (typically by a lead distance of approximately 10 percent of the rate of descent in feet per minute), smoothly increasing pitch to stop the descent, adjusting power to maintain the desired airspeed, and trimming to relieve control pressures.
Plain English
The pilot stops a descent and returns to flying level at a chosen altitude. Because the aircraft cannot stop descending the instant the controls move, the pilot starts the level-off a little before reaching the target altitude so the aircraft settles right on it.
Context Anchor
Seen in instrument flying when a descent ends at an assigned or planned altitude.
Derivation
“Level” comes from the idea of being even or horizontal. In flying, to “level off” means to change from climbing or descending to holding a steady altitude.
Why Pilots Care
Prevents altitude overshoots or undershoots and maintains smooth control during altitude changes.
Grounding Statement
Picture the airplane descending toward a target altitude, then gently raising the nose before reaching it so the downward motion stops right on altitude.
Intuition Check
Level off does not mean simply release the controls or wait until the airplane stops descending by itself. It means actively and smoothly transition the airplane from a descent to steady altitude flight.
Example Sentence 1
Approaching 4,000 feet at 500 feet per minute, the pilot began the level off from descent about 50 feet early so the aircraft settled smoothly at the assigned altitude.
Example Sentence 2
Adding power while raising the nose allowed the aircraft to level off from descent without gaining excess speed.