Under the clean aircraft concept, which scenario is described as a violation requiring no takeoff?

• A. Takeoff when frost, ice and snow adheres to a critical surface of the aircraft
• B. Takeoff when frost, ice and snow adheres to noncritical surfaces
• C. Takeoff in light rain only
• D. Takeoff with no icing present on surfaces

Answer: (A)

Under the clean aircraft concept, you must not take off with frost, ice, or snow on surfaces that are critical to aerodynamic performance. Frost, ice, or snow on a critical surface can disrupt airflow, raise stall speed, and reduce controllability, making takeoff unsafe. This is why the scenario describing frost, ice, and snow on a critical surface is a no-takeoff violation until the contamination is removed. Frost or ice on noncritical surfaces is less threatening to the immediate takeoff performance, so it does not constitute an automatic no-takeoff condition, while takeoff with no icing present is clearly acceptable. Takeoff in light rain isn’t an icing contamination issue in this context.