Definition
A foundational rule of energy management stating that an airplane's total energy state is determined by the combined use of pitch (which trades altitude for airspeed or vice versa) and power (which adds or removes total energy through thrust). Neither control alone governs the airplane's energy; they must be coordinated. Pitch redistributes existing energy between altitude (potential energy) and airspeed (kinetic energy), while power changes the total amount of energy available.
Plain English
How fast the airplane is going and how high it is together make up its energy. The pilot manages that energy by using the elevator and the throttle together. The elevator shifts energy between speed and height, and the throttle adds or removes energy overall.
Context Anchor
Seen when learning climbs, descents, approaches, go-arounds, and any situation where the pilot must manage both airspeed and altitude.
Derivation
“Pitch” comes from older uses meaning to set or place at an angle. “Power” means the ability to do work. “Energy” comes from a Greek idea of being active or at work. Together, the phrase points to a practical flying idea: the airplane’s nose angle and engine output determine what the airplane can do next.
Why Pilots Care
Correct energy management lets the pilot maintain stable airspeed and altitude, avoid stalls, and fly precise approaches and go-arounds.
Analogy
Think of a bicycle on a hill. Pedaling harder is power -- it adds energy. Tilting downhill or uphill is pitch -- it trades height for speed or speed for height. To arrive at the bottom of the hill at the right speed, you manage both together, not one or the other.
Grounding Statement
If the nose is raised without enough power, the airplane may slow down; if power is added without the right pitch, the airplane may speed up or climb more than intended.
Intuition Check
Do not assume pitch controls only altitude and power controls only speed. In real flying, pitch and power work together to control the airplane’s total speed-and-altitude condition.
Example Sentence 1
On final approach, the instructor reminded the student that pitch plus power controls energy state, so reducing power without adjusting pitch would cause the airspeed to decay below approach speed.
Example Sentence 2
During a go-around the pilot adds power and raises pitch to change the energy state from descent to climb.