A remote pilot plans to operate at 350 feet AGL near a small airport. The sectional chart shows a dashed magenta circle around the airport boundary. Is ATC authorization required, and why?

Why →A dashed magenta line on a sectional chart indicates Class E airspace that extends from the surface upward. This is found around airports that have instrument approach procedures but no operating control tower. Under § 107.41, Class E surface areas require ATC authorization the same as Class B, C, and D. A solid magenta (shaded) line indicates Class E beginning at 700 feet AGL, which is a different pattern.

The trap →The 700-foot AGL and Class D answers swap the chart vocabulary. Dashed magenta (surface Class E) and shaded magenta (700 AGL Class E) look similar and are the most commonly confused symbols on the sectional.

Field note →Memorize: dashed magenta = surface = authorization required. Shaded/fading magenta = 700 AGL = no authorization needed for typical drone ops. This distinction shows up on nearly every Part 107 exam.