What is the dotted line in Class E airspace?

The area in that dashed magenta line is called an extension. It is Class E airspace that goes all the way down to the surface.



In the world of aviation and sectional charts, a dashed (dotted) magenta line indicates the boundaries of Class E airspace that starts at the surface. Normally, Class E airspace begins at either 700 feet or 1,200 feet AGL (Above Ground Level), but at certain airports without a control tower—yet equipped with instrument approach procedures—the Class E is "brought down" to the surface to provide a protected environment for pilots flying in "Instrument Meteorological Conditions" (IMC). This dashed magenta line tells a VFR (Visual Flight Rules) pilot that they must adhere to stricter weather minimums: they need at least 3 statute miles of visibility and must stay 500 feet below, 1,000 feet above, and 2,000 feet horizontally from clouds to operate within that area. A grounded peer tip: if you see this "magenta box" on your chart, it’s a signal that the airport has significant "instrument traffic," and you should be extra vigilant on the radio, as commercial or private jets may be breaking out of the clouds right at the runway threshold.

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Inside the blue zipper line, Class E airspace begins at the indicated altitude.

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Sometimes Class E airspace goes all the way down to the surface of the ground. This is called Class E surface area.

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Class E airspace extensions begin at the surface and extend up to the overlying controlled airspace. The extensions provide controlled airspace to contain standard instrument approach procedures without imposing a communications requirement on pilots operating under VFR.

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Federal airways and low-altitude RNAV routes are Class E airspace and unless otherwise specified, extend upward from 1,200 feet AGL to, but not including, 18,000 feet MSL. Offshore/Control Airspace Areas.

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Class E airspace: Transponder requirements vary depending on the altitude of the aircraft: Below 10,000 feet MSL (mean sea level): A transponder is not required unless the aircraft is within 30 nautical miles of a Class B airport.

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The FAA requires ADS-B Out capability in the continental United States, in the ADS-B rule airspace designated by FAR 91.225: Class A, B, and C airspace; Class E airspace at or above 10,000 feet msl, excluding airspace at and below 2,500 feet agl; Within 30 nautical miles of a Class B primary airport (the Mode C veil);

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When you are flying under VFR (Visual Flight Rules), which you will be flying under 99.9% of the time as a private pilot, you do not need a clearance to enter into Class E airspace.

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In class E airspace, IFR aircraft are controlled by ATC. This might be a center facility (Air Route Traffic Control Center) or approach/departure facility. As a VFR aircraft, you aren't required to be in contact with ATC, but IFR aircraft must operate on an ATC clearance. That means the airspace is controlled.

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Recall that the thick and fuzzy magenta circle or set of lines indicate Class E airspace starting at 700 ft. AGL. Everywhere else, meaning anytime you're outside of the thick and fuzzy magenta circle or set of lines, or nothing is being indicated on the sectional chart, Class E airspace starts at 1,200 ft.

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Paramotors can be flown in uncontrolled airspace (Class G and most Class E airspace) and cannot be flown over congested areas of people or restricted areas. Additional areas may be off-limits in the event of a Temporary Flight Restriction (TFR) as noted in a Notice to Airmen (NOTAM).

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Flightradar24. @flightradar24. The dotted line means that aircraft was out of coverage. It's a straight line between points where coverage was lost and resumed.

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