A Blue Segmented Circle On A Sectional Chart
Sectional charts are aviation maps that display the airspace of a particular region. These charts are essential for pilots to navigate and fly safely. One of the features on sectional charts is a blue segmented circle. This article will explain what the blue segmented circle means and how to read it.
What Is A Sectional Chart?
A sectional chart is a type of aviation map used by pilots to navigate through specific regions of airspace. The chart displays a variety of information, including topography, airspace boundaries, airports, radio frequencies, and more. Pilots use sectional charts to plan their flights, navigate in flight, and communicate with air traffic control.
What Is A Blue Segmented Circle On A Sectional Chart?
A blue segmented circle is a symbol that appears on sectional charts to indicate a class D airspace. Class D airspace is airspace where air traffic control services are provided to aircraft. This airspace is usually around smaller airports with control towers.
How To Read A Blue Segmented Circle On A Sectional Chart
Reading a blue segmented circle on a sectional chart is relatively straightforward. The circle will have a solid blue line around the outside and a segmented blue line on the inside. The segmented line represents the boundary of the class D airspace. Pilots who enter this airspace must establish two-way communication with air traffic control before entering.
Other Airspace Classes
Aside from class D airspace, there are several other airspace classes that pilots need to be aware of. The different classes of airspace are defined based on the level of control and communication required for pilots to operate safely. Understanding the different airspace classes is crucial for pilots to avoid violating regulations and ensure safe flight operations.
Class A
Class A airspace is the most restrictive airspace in the United States. This airspace starts at 18,000 feet and goes up to 60,000 feet. All aircraft operating in class A airspace must be under instrument flight rules (IFR) and have clearance from air traffic control.
Class B
Class B airspace is typically around major airports with high volumes of air traffic. This airspace is defined by a solid blue line on sectional charts. Pilots who wish to enter class B airspace must obtain clearance from air traffic control and follow specific procedures.
Class C
Class C airspace is similar to class B airspace but is typically around smaller airports with less air traffic. Pilots who wish to enter class C airspace must establish communication with air traffic control and obtain clearance before entering.
Class E
Class E airspace is the most common type of airspace in the United States. This airspace is defined by a dashed magenta line on sectional charts. Pilots operating in class E airspace must follow specific regulations, but they do not need clearance from air traffic control.
Class G
Class G airspace is uncontrolled airspace that exists below class E airspace. Pilots operating in class G airspace do not need clearance from air traffic control, but they must follow specific regulations and maintain visual flight rules (VFR).
Conclusion
Sectional charts and airspace classes are essential for pilots to navigate and fly safely. Understanding the different types of airspace and how to read sectional charts is crucial for pilots to operate safely and avoid violating regulations. The blue segmented circle on a sectional chart indicates class D airspace, which requires pilots to establish communication with air traffic control before entering.