FAA Ground School Practice Test

A blue segmented circle on a sectional chart indicates which class of airspace?

1. Class C airspace

2. Class D airspace

3. Class B airspace

4. Class E airspace

The correct answer is: Class D airspace

A blue segmented circle on a sectional chart specifically indicates Class D airspace. Class D airspace usually surrounds airports that have a control tower, and the blue segmentation signifies that pilots are required to maintain two-way radio communication with air traffic control when operating within this airspace. Class D airspace typically extends from the surface up to a designated altitude, which varies depending on air traffic, local regulations, and the airport's operational needs. The segmented nature of the circle represents the controlled area around the airport where special procedures are in place to ensure the safety of aircraft operating in close proximity to the air traffic control tower. In contrast, other classes of airspace are represented differently on sectional charts. For instance, Class B airspace is shown with a solid blue circle, Class C airspace is denoted with a solid magenta circle, and Class E airspace is often represented by a shaded or dotted magenta line. Understanding these visual cues is crucial for pilots to ensure they are complying with the air traffic regulations that correspond to the airspace they are flying in.