Which instrument displays the speed of the aircraft?

The airspeed indicator is the instrument that displays the speed of the aircraft. It measures the dynamic pressure of the air flowing around the aircraft and converts that measurement into a speed reading, typically expressed in knots or miles per hour. This information is crucial for pilots to manage performance during different phases of flight, such as takeoff, cruising, and landing, as it helps ensure that the aircraft operates within safe and efficient speed parameters.

Other instruments listed serve different purposes. The altimeter measures altitude by comparing the atmospheric pressure outside the aircraft to a standard pressure, aiding in altitude management. The heading indicator shows the current direction in which the aircraft is pointed, which is vital for navigation. The vertical speed indicator indicates whether the aircraft is climbing or descending and at what rate, providing necessary information about altitude changes. Each instrument plays a key role in flight operations, but only the airspeed indicator specifically provides the speed of the aircraft.