How do icing protection systems function and when should they be used?

• A. They are only decorative
• B. Anti-ice prevents ice buildup on surfaces; de-ice removes existing ice; use according to weather conditions and aircraft manuals.
• C. They operate during takeoff only
• D. They spray water to wash surfaces

Answer: (B)

Ice can disrupt airflow, reduce lift, and affect handling, so aircraft use icing protection systems to manage ice by both preventing formation and removing ice that has already formed. Anti-ice keeps surfaces from ice building up, using methods like heated air, electrical heating, or chemical coatings to stay ahead of icing. De-ice systems, on the other hand, remove ice that has already accumulated, through means such as fluid application, inflatable boots, or mechanical removal, when ice is present.

These systems are used based on weather conditions and the procedures in the aircraft’s flight manual or manufacturer guidance. Engage anti-ice when icing conditions are anticipated to prevent buildup, and apply de-ice once ice is detected or accumulating, following the limits and procedures in the manual. They’re for actual ice management, not decoration, not limited to takeoff, and not for washing surfaces.