A blue segmented circle on a Sectional Chart depicts which class airspace?

A blue segmented circle on a Sectional Chart depicts which class airspace?

• A. Class E
• B. Class D
• C. Class B
• D. Class C

Answer: (B)

This symbol shows Class D airspace around a towered airport. On VFR sectional charts, a blue boundary drawn as a series of short blue segments indicates this specific class. The segmented nature means the airspace is in effect only when the airport’s control tower is open; when the tower is closed, that airspace is not in effect and the area reverts to the surrounding Class E (or G). The top of Class D is typically up to 2,500 feet above the airport elevation, and entry requires two-way radio communication with the tower and ongoing in-flight communication while inside. Different airspace classes are depicted with other line styles: a solid blue outline shows Class B, and a solid magenta outline shows Class C, so the blue segmented circle uniquely identifies Class D.

This symbol shows Class D airspace around a towered airport. On VFR sectional charts, a blue boundary drawn as a series of short blue segments indicates this specific class. The segmented nature means the airspace is in effect only when the airport’s control tower is open; when the tower is closed, that airspace is not in effect and the area reverts to the surrounding Class E (or G). The top of Class D is typically up to 2,500 feet above the airport elevation, and entry requires two-way radio communication with the tower and ongoing in-flight communication while inside.

Different airspace classes are depicted with other line styles: a solid blue outline shows Class B, and a solid magenta outline shows Class C, so the blue segmented circle uniquely identifies Class D.