The attitude an direction indicator (ADI), formerly known as the gyro horizon or artificial horizon, is a flight instrument that informs the pilot of the aircraft orientation relative to Earth's horizon, and gives an immediate indication of the smallest orientation change. The miniature aircraft and horizon bar mimic the relationship of the aircraft relative to the actual horizon. It is a primary instrument for flight in instrument meteorological conditions.

This is a Cold War / Vietnam War era Attitude Indicator type ARU-11/A, was made by Lear, Model 4060P. This instrument was mounted on the instrument panel of the US Air Force F4 Phantom II jet fighter.