In the context of aircraft operations, what is the appropriate action when a deviation is noted on the VSI?

When a deviation is noted on the Vertical Speed Indicator (VSI), it indicates that the aircraft is climbing or descending when it should be maintaining a stable altitude. The VSI is a critical instrument for monitoring altitude changes, and any unexpected deviation suggests that the aircraft is not maintaining its desired altitude.

Adjusting altitude accordingly allows the pilot to correct the situation and return the aircraft to the intended flight level. This action involves either increasing power to maintain level flight if the aircraft is descending unintentionally or reducing power or adjusting pitch if it is climbing without intention, ensuring that the aircraft operates safely within its designated altitude.

Maintaining current altitude without addressing the deviation may result in an unsafe situation, such as unintentionally entering a climb or descent. Increasing power immediately may not be the most appropriate response if the VSI indicates descent, as this could exacerbate the situation. Turning to a different heading does not directly address the altitude deviation and may lead to further complications without resolving the core issue of maintaining the correct altitude. Thus, adjusting altitude is the necessary corrective action to ensure safe flight.