Final answer:
A category of aircraft in the certification of airmen refers to a broad classification based on the type of propulsion and intended use, with further divisions into classes like single-engine or multi-engine. Historical contributions by groups such as the WAC and WASP during World War II illustrate the roles within the heavier-than-air category.
Step-by-step explanation:
Certification of Airmen and Aircraft Categories
Within the realm of aviation and the certification of airmen, a category of aircraft is a broad classification that refers to the type of propulsion, intended use, and other characteristics of the aircraft. For example, aircraft can be categorized broadly into airplanes, rotorcraft, gliders, lighter-than-air vehicles, and so forth. Each of these categories is then further divided into classes such as single-engine, multi-engine, landplanes, seaplanes, etc., and these classifications have specific certification requirements for pilots.
Furthermore, during World War II, there were remarkable contributions made by women such as members of the Women's Army Corps (WAC) and civilian pilots in the Women's Airforce Service Pilots (WASP) program. These women not only repaired aircraft but also flew them, showcasing their extensive aeronautical skills and further emphasizing the diversity of roles within the category of heavier-than-air craft.