Ice covering more than what percent of the runway prohibits takeoff?

• A. 10%
• B. 75%
• C. 25%
• D. 50%

Answer: (C)

The key idea is how much of the runway is covered by ice and how that affects takeoff performance. When ice blankets the surface, it greatly reduces both acceleration and braking action. For takeoff, there’s a defined contamination threshold: if ice covers more than 25 percent of the usable runway, takeoff is prohibited because performance becomes too unreliable and the risk of an overrun or loss of control increases.

If ice covers 25 percent or less, takeoff may be permitted, but you must use performance data that account for contamination and ensure there’s enough usable distance and braking capability for a safe departure. The other percentages listed aren’t the standard limit used to prohibit takeoff; they don’t match the established threshold, which is 25 percent.