What does the vertical speed indicator display in the TH-73A?

• A. The aircraft's airspeed during cruise
• B. The altitude above sea level
• C. The rate of climb or descent
• D. The aircraft's fuel consumption rate

Answer: (C)

The vertical speed indicator (VSI) in the TH-73A displays the rate of climb or descent, which is crucial for pilots to understand the aircraft's vertical performance. This instrument indicates the rate at which the aircraft is ascending or descending, typically measured in feet per minute.

Understanding this rate allows pilots to manage their flight path effectively, ensuring they maintain desired altitude and perform controlled climbs or descents as needed. The VSI reacts to changes in altitude, providing immediate feedback to the pilot on their vertical movement relative to the surrounding airspace. This information is vital during critical phases of flight, such as takeoff, landing, and when navigating through differing altitudes.

Other options, such as airspeed during cruise, altitude above sea level, or fuel consumption rate, represent different measurements that do not pertain to vertical speed, highlighting the specificity and importance of the VSI in providing accurate vertical movement data.