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Aircraft systems and instrumentsQuestion 507 of 934

An airplane has no alternate static source and the static port is blocked. What does the PHAK suggest?

  1. Break the glass face of the VSI
  2. Break the glass face of the altimeter
  3. Break the glass face of the airspeed indicator
  4. Pull the pitot heat circuit breaker
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Correct answer: Break the glass face of the VSI

The VSI is the least important static source instrument for flight.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 8: Flight Instruments — Pitot-Static Flight Instruments — Static Pressure Chamber and Lines, page 205

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026