Multiple choice

Which of the following instruments shows a lag error during a sudden climb or descent?

  1. VSI

  2. ASI

  3. ILS

  4. VOR
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A Correct answer
Explanation

The Vertical Speed Indicator (VSI) exhibits a characteristic lag during rapid altitude changes because it relies on pressure equalization through a calibrated orifice. During sudden climbs or descents, there's a delay of 6-9 seconds before the VSI shows the correct rate. This lag is an inherent design characteristic and not a malfunction.

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