airspace Class E

Airspace in which both IFR (instrument flight rules) and VFR (visual flight rules) flights are permitted. Only IFR flights are subject to air traffic control service and are separated from other IFR flights. All flights receive traffic information as far as is practical. This airspace is similar to Class D airspace but differs in that prior clearances are not required for VFR flights, but ATC (air traffic control) clearances are required for aerodromes operation at ATC aerodromes irrespective of surrounding airspace classification. Class E airspace extends upward from either the surface or a designated altitude to the overlying or adjacent controlled airspace. When designated as a surface area, this airspace is configured to contain all instrument procedures. Also in this class are federal airways, airspace beginning at either 700 or 1200 ft AGL (above ground level) used to transition to and from the terminal or en route environment, en route domestic, and offshore airspace designated below 18,000 ft MSL (mean sea level). Unless designated at a lower altitude, Class E airspace begins at 14,500 ft MSL over the United States, including that airspace over-lying the waters within 12 NM of the coast of the 48 contiguous states and Alaska, up to, but not including, 18,000 ft MSL, and the airspace above FL (flight level) 600. Class E airspace below 14,500 ft MSL is charted on sectional, terminal, world, and IFR en route low-altitude charts. Formerly known as general controlled airspace.
Class E airspace as depicted on sectional charts.
Airspace classification letter is displayed in association with the airspace type and vertical limits on aeronautical charts in this manner.

Aviation dictionary. 2014.

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