Definition
An instrument that displays the aircraft's pitch and bank relative to the horizon, often combined with steering cues from the flight director to show the pilot how to fly a commanded flight path. In modern glass cockpits, the ADI function is presented on the primary flight display.
Plain English
A cockpit display that shows whether the aircraft's nose is pointing up or down and whether the wings are level or banked, and can also show steering bars telling the pilot which way to turn or pitch to follow a planned path.
Context Anchor
Seen on the instrument panel during instrument flying, especially when using a flight director or flying without a clear outside horizon.
Derivation
Attitude here comes from the Latin aptitudo, meaning 'posture' or 'position'. In aviation it refers to the aircraft's position in space relative to the horizon, not a state of mind. Direction Indicator is added because the instrument also shows steering guidance, not just attitude.
Why Pilots Care
It supplies attitude reference when outside visual cues are absent, allowing safe instrument flight and recovery from unusual attitudes.
Grounding Statement
If you are in cloud and cannot see outside, the ADI gives you the artificial horizon you need to keep the airplane oriented correctly.
Intuition Check
Attitude does not mean mood or behavior here. It means the aircraft’s physical orientation: nose position and wing tilt relative to the horizon.
Example Sentence 1
After entering the clouds, the pilot transitioned to instruments and used the ADI to keep the wings level.
Example Sentence 2
During the missed approach the ADI showed a slight nose-up pitch as the aircraft climbed.