Definition
A gyroscopic flight instrument that displays the airplane's pitch and bank attitude relative to the natural horizon. It uses a spinning gyro mounted so its spin axis stays vertical, providing a stable reference against which the aircraft's movement is shown on a small artificial horizon line. Also known as an attitude indicator or artificial horizon.
Plain English
An instrument on the panel that shows whether the airplane's nose is pointed up or down, and whether the wings are level or tilted, by comparing the aircraft to a small line representing the horizon.
Context Anchor
Seen on the instrument panel during normal flying, instrument flying, and any time outside visual references are poor.
Derivation
From Greek gyros meaning 'a turn' or 'circle,' referring to the spinning wheel inside that holds its position in space. Combined with 'horizon' because the instrument recreates a small artificial horizon for the pilot to fly against.
Why Pilots Care
It lets the pilot maintain controlled flight when the natural horizon is invisible, reducing the risk of spatial disorientation.
Analogy
Think of it as a small, steady picture of the horizon mounted inside the cockpit that stays level no matter how the airplane banks or pitches.
Intuition Check
The “horizon” in gyro horizon is not the real outside skyline. It is an instrument display that represents a level reference for the airplane.
Example Sentence 1
Before entering the cloud layer, the pilot cross-checked the gyro horizon to confirm the wings were level.
Example Sentence 2
During the unusual attitude recovery, the instructor had the student cover the gyro horizon to practice partial-panel flying.