AC 20-117 addresses hazards following ground deicing and ground operations in conditions conducive to aircraft icing. Which topic best matches its purpose?

• A. Hazards Following Ground Deicing and Ground Operations in Conditions Conducive to Aircraft Icing
• B. Aeronautical Decision Making
• C. Certification: Pilots and Flight and Ground Instructors
• D. Pilots' Role in Collision Avoidance

Answer: (A)

Hazards that can persist after ground deicing and during ground operations in icing conditions. This AC focuses on identifying and mitigating the dangers that remain or can redevelop once deicing/anti-icing has been applied and the aircraft is moving in or preparing for flight in icing conditions. It covers issues such as residual contamination on surfaces, the effectiveness and limits of deicing fluids, holdover time concepts, recontamination risks during taxi or preflight actions, and the critical checks needed to determine whether surfaces are clean enough for takeoff. The goal is to help pilots recognize when it’s unsafe to proceed and what steps to take to reduce risk, such as reapplying deicing/anti-icing if necessary, or delaying takeoff until surfaces are verified clean.

Other topics referenced—general aeronautical decision making, certification of pilots and instructors, or pilots’ role in collision avoidance—address broader or different areas of flight safety and operations and do not specifically target the hazards that arise after ground deicing and during ground operations in icing conditions.