Which three instruments collectively provide airspeed, altitude, and vertical speed information?

• A. Airspeed Indicator (ASI) for airspeed, Altimeter for altitude, Vertical Speed Indicator (VSI) for vertical speed
• B. Attitude Indicator, Altimeter, Turn Coordinator
• C. Airspeed Indicator, Attitude Indicator, VSI
• D. Altimeter, Turn Coordinator, VSI

Answer: (A)

Understanding which instruments give airspeed, altitude, and vertical speed comes down to knowing what each instrument measures. The Airspeed Indicator uses dynamic pressure from the pitot tube to display how fast the aircraft is moving through the air. The Altimeter relies on static pressure to show your altitude. The Vertical Speed Indicator tracks how quickly the ambient pressure is changing, showing climb or descent rate in feet per minute. All three are part of the pitot-static system and work together to give the pilot a complete sense of speed, height, and vertical movement.

The other instrument pairings don’t provide all three readings: an Attitude Indicator shows aircraft attitude, not speed or altitude; a Turn Coordinator shows rate of turn and event quality, not vertical speed; and any combination missing one of the three needed readings won’t give a full picture of airspeed, altitude, and vertical speed.