What happens to the VSI when the static port becomes plugged?

Prepare for the Transport Canada Commercial Pilot License Exam. Study with flashcards and multiple choice questions, each complemented by hints and explanations. Ace your pilot certification test!

When the static port becomes plugged, the vertical speed indicator (VSI) will return to zero. This occurs because the VSI operates based on changes in air pressure sensed through the static port. If the static port is blocked, the instrument cannot register any changes in static pressure, which means it cannot accurately reflect whether the aircraft is climbing, descending, or in level flight. As a result, the VSI will effectively freeze at its current reading, which, after a period of time, could appear as if it is showing zero vertical speed, especially in level flight.

It's important to understand that a blocked static port can lead to various anomalies in other instruments relying on static pressure as well, but the VSI is particularly affected in that it will stop responding to actual vertical movement. This can give pilots a false sense of performance, so understanding the impact of a blocked static port is crucial for safe flight operations.

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