Under GRF, runway surface assessment is required whenever which condition is present?

Under GRF, runway surface assessment is required whenever which condition is present?

• A. When the runway is dry
• B. When contaminants are present
• C. During nighttime operations
• D. Whenever the wind exceeds 25 knots

Answer: (B)

Contaminants on the runway change how the surface behaves, reducing friction and altering braking action. When any substance such as water, ice, snow, slush, fuel, or rubber buildup is present, the braking effectiveness can deteriorate, making it essential to assess the surface to determine safe braking performance and needed corrective actions (de-icing, cleaning, or treatment). Without contaminants, a routine surface check isn’t triggered by normal dry conditions, and nighttime or wind alone don’t mandate a surface assessment unless contaminants are involved.

Contaminants on the runway change how the surface behaves, reducing friction and altering braking action. When any substance such as water, ice, snow, slush, fuel, or rubber buildup is present, the braking effectiveness can deteriorate, making it essential to assess the surface to determine safe braking performance and needed corrective actions (de-icing, cleaning, or treatment). Without contaminants, a routine surface check isn’t triggered by normal dry conditions, and nighttime or wind alone don’t mandate a surface assessment unless contaminants are involved.