Which airspeed range corresponds to the White Arc?

Which airspeed range corresponds to the White Arc?

• A. 40-111 knots
• B. 35-65 knots
• C. 85-149 knots
• D. 35-85 knots

Answer: (D)

The white arc shows the flap-operating range. Its lower limit is the stall speed with flaps down (landing configuration), and its upper limit is the maximum speed at which flaps can be extended (Vfe). In typical light airplanes, this range is about 35–85 knots, so the white arc spans roughly 35 to 85 knots. That’s why the option matching 35–85 knots is correct. The other ranges either exceed Vfe, omit the stall-with-flaps region, or start above the stall limit, which isn’t consistent with the flap operating window.

The white arc shows the flap-operating range. Its lower limit is the stall speed with flaps down (landing configuration), and its upper limit is the maximum speed at which flaps can be extended (Vfe). In typical light airplanes, this range is about 35–85 knots, so the white arc spans roughly 35 to 85 knots. That’s why the option matching 35–85 knots is correct. The other ranges either exceed Vfe, omit the stall-with-flaps region, or start above the stall limit, which isn’t consistent with the flap operating window.