Definition
The process of converting an aircraft's kinetic energy (energy of motion) into other forms — primarily heat — in order to slow or stop the aircraft during the landing roll. On landing, kinetic energy is shed mainly through wheel braking (friction generating heat in the brakes and tires), aerodynamic drag, and, where available, reverse thrust or spoilers.
Plain English
Getting rid of the airplane's motion energy after touchdown so it can stop. Most of that energy turns into heat in the brakes and tires.
Context Anchor
Seen in landing performance discussions, especially when comparing approach speed, touchdown speed, braking, runway surface, and stopping distance.
Derivation
From Latin dissipare, meaning 'to scatter' or 'to disperse.' The idea is that the energy isn't destroyed — it's spread out into heat and friction until the aircraft is no longer moving.
Why Pilots Care
Proper energy dissipation determines the runway length required for a safe stop and prevents brake overheating or runway overruns.
Analogy
Like a car using brakes and wind resistance to slow down on a long downhill exit ramp.
Grounding Statement
Picture an airplane crossing the runway threshold too fast: that extra speed must be removed before the airplane can stop, and removing it takes distance.
Intuition Check
Energy dissipation does not mean energy simply disappears. It means the aircraft’s speed and height energy are changed into less useful forms, such as heat, friction, and moving air.
Example Sentence 1
Touching down even a few knots fast significantly increases the energy dissipation required and lengthens the landing roll.
Example Sentence 2
On a short runway, maximum energy dissipation is achieved by applying brakes firmly while maintaining directional control.