Plain English Meaning

How much speed and height the airplane currently has, plus whether it is gaining or losing them. A pilot manages energy state by trading speed for altitude, altitude for speed, or by adding or reducing power.

Full Definition

The airplane's total mechanical energy at any given moment, made up of its kinetic energy (from speed) and its potential energy (from altitude), together with the rate at which that energy is being gained or lost through engine power and drag.

Context Anchor

Used in basic airplane control and maneuvering discussions, especially when judging whether the airplane has enough speed, height, and power for a climb, turn, approach, or .