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Aircraft systems and instrumentsQuestion 525 of 934

What type of instrument is the VSI?

  1. A direct reading instrument that uses pitot pressure
  2. A differential pressure instrument using static pressure
  3. A gyroscopic instrument that uses vacuum pressure
  4. A differential instrument that uses pitot and static pressure
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Correct answer: A differential pressure instrument using static pressure

A calibrated leak lets the case pressure change more slowly than the diaphragm pressure.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 8: Flight Instruments — Vertical Speed Indicator (VSI) — Principle of Operation, page 209

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026