FAA Aircraft Dispatcher Practice Exam

Which of the following are types of structural icing?

1. Rime, Clear, Mixed

2. Soft, Hard, Liquid

3. Light, Dense, Frosted

4. Thin, Thick, Rough

The correct answer is: Rime, Clear, Mixed

The correct answer identifies the three primary types of structural icing that can occur during flight operations. Rime icing forms when supercooled water droplets freeze rapidly upon contact with a surface, leading to a rough, opaque appearance. It typically occurs in colder temperatures and at lower altitudes. Clear icing, on the other hand, is caused by larger supercooled water droplets that freeze more slowly, resulting in a clear, smooth layer of ice that can be particularly hazardous due to its heavier weight and ability to disrupt airflow over wings and control surfaces. Mixed icing contains both rime and clear components and occurs under varying atmospheric conditions. Understanding these types of structural icing is crucial for aircraft dispatchers, as they play a significant role in safety and operational decisions related to weather conditions. By recognizing the characteristics of each type, dispatchers can better assess the potential impact on flight operations and make informed choices regarding de-icing procedures, alternate routing, or delays. The other options do not accurately reflect the established classifications of icing. They focus on different characteristics or conditions that are not formally recognized as types of structural icing, making them unsuitable in this context.