Which of the following instruments are classified as pitot/static instruments?

The pitot/static instruments are essential devices that utilize pressure information to provide crucial flight data. The correct choice includes the altimeter, vertical speed indicator (VSI), and airspeed indicator, all of which rely on data from the pitot and static systems to function properly.

The altimeter measures the aircraft's altitude by comparing static air pressure to a standard reference, allowing pilots to maintain proper altitude during flight. The VSI, on the other hand, measures the rate of climb or descent by sensing changes in static pressure over time. The airspeed indicator uses the dynamic pressure from the pitot tube and static pressure to show the aircraft's airspeed. Together, these instruments provide critical information about the aircraft's performance and help pilots maintain safe flight operations.

The other options include instruments that do not fall under the pitot/static category. For instance, the turn coordinator is an artificial horizon device that does not rely on pressure measurements, and the heading indicator is magnetic and works independently of the pitot/static system. Understanding the classification of aircraft instruments is key for safe and effective piloting, especially in navigating and responding to various flight conditions.