Aircraft systems and instrumentsQuestion 533 of 934

What does the white arc on the airspeed indicator show?

  1. The normal operating range
  2. The caution range
  3. The flap operating range
  4. The never-exceed speed
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Correct answer: The flap operating range

The lower limit of the white arc is VSO. The upper limit is VFE.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 8: Flight Instruments — Airspeed Indicator Markings, page 211

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026