Which instrument indicates the bank, pitch, and yaw of an airplane?

The Attitude Indicator is the instrument that provides essential information regarding the bank, pitch, and yaw of an airplane. It displays the orientation of the aircraft relative to the horizon, allowing the pilot to maintain control and understand how the aircraft is positioned in three-dimensional space. The bank angle indicates how much the aircraft is tilted laterally, the pitch angle reveals the elevation or descent of the nose relative to the horizon, and while yaw is not directly represented, the instrument still assists in overall spatial awareness regarding the aircraft’s heading as it relates to its orientation.

In contrast, the other instruments serve different functions: the Altimeter measures altitude by sensing atmospheric pressure, the Vertical Speed Indicator gauges the rate of climb or descent, and the Heading Indicator displays the current heading of the aircraft in terms of compass direction. Each of these instruments is vital for flight, but only the Attitude Indicator directly combines information about bank and pitch, thus making it indispensable for understanding the airplane's spatial orientation.