Private Pilot Private Exam

Which instrument is primarily used to display aircraft altitude?

1. Airspeed indicator

2. Vertical speed indicator

3. Altimeter

4. Attitude indicator

The correct answer is: Altimeter

The altimeter is the instrument specifically designed to measure and display the aircraft's altitude above sea level. It works by measuring changes in atmospheric pressure; as an aircraft ascends, the air pressure decreases, and this change is interpreted by the altimeter to provide a corresponding altitude reading. Understanding altitude is critical for safe flight operations, as it helps pilots maintain a specific flight level, clear terrain, and adhere to air traffic control instructions. An altimeter typically displays altitude in feet or meters, which is essential for navigating and ensuring compliance with various altitude restrictions during flight. The other instruments mentioned serve different purposes. The airspeed indicator measures the speed of the aircraft relative to the surrounding air, which is crucial for determining performance parameters and maintaining flight safety, especially during takeoffs and landings. The vertical speed indicator indicates the rate of climb or descent in feet per minute, providing crucial information about how quickly the aircraft is changing altitude but not the actual altitude itself. The attitude indicator shows the aircraft's orientation relative to the horizon, helping pilots maintain control and situational awareness, particularly during maneuvers and in poor visibility conditions.