What does the Instantaneous Vertical Speed Indicator (IVSI) indicate?

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Study for the Pilot's Handbook of Aeronautical Knowledge Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

What does the Instantaneous Vertical Speed Indicator (IVSI) indicate?

Explanation:
The IVSI shows the current rate of vertical movement—the climb or descent rate at this exact moment. It’s designed to respond quickly, so changes in pitch or power are reflected with minimal lag, giving you a near real-time readout of your vertical speed. This differs from a standard VSI, which tends to show an averaged rate over a short interval and can lag behind actual changes. The IVSI does not indicate ground speed or temperature; those are measured by other instruments.

The IVSI shows the current rate of vertical movement—the climb or descent rate at this exact moment. It’s designed to respond quickly, so changes in pitch or power are reflected with minimal lag, giving you a near real-time readout of your vertical speed. This differs from a standard VSI, which tends to show an averaged rate over a short interval and can lag behind actual changes. The IVSI does not indicate ground speed or temperature; those are measured by other instruments.

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