Is takeoff allowed with frost, ice, snow, or slush adhering to any critical areas?

Is takeoff allowed with frost, ice, snow, or slush adhering to any critical areas?

• A. Yes
• B. No
• C. Only if de-iced
• D. Only in the daytime

Answer: (B)

Frost, ice, snow, or slush on critical surfaces disrupts the airflow over the wing and tail, which can dramatically increase stall speed and reduce lift. Even small amounts on the leading edges or control surfaces can cause unpredictable handling and loss of performance during takeoff and initial climb. Because of this, you’re not allowed to take off if any such contamination is adhering to critical areas. Surfaces must be clean and dry before takeoff, which may involve de-icing/anti-icing procedures and a confirmation that no contamination remains. The decision isn’t about the time of day or about partial de-icing—if frost or other deposits are present on critical surfaces, takeoff is not permitted.

Frost, ice, snow, or slush on critical surfaces disrupts the airflow over the wing and tail, which can dramatically increase stall speed and reduce lift. Even small amounts on the leading edges or control surfaces can cause unpredictable handling and loss of performance during takeoff and initial climb. Because of this, you’re not allowed to take off if any such contamination is adhering to critical areas. Surfaces must be clean and dry before takeoff, which may involve de-icing/anti-icing procedures and a confirmation that no contamination remains. The decision isn’t about the time of day or about partial de-icing—if frost or other deposits are present on critical surfaces, takeoff is not permitted.