Class G airspace includes all airspace below 14,500 feet (4,400 m) MSL not otherwise classified as controlled. There are no entry or clearance requirements for class G airspace, even for IFR operations.
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Class D is used for all control zones and most terminal areas. Class E is generally used for all airspace from 3500 feet to FL195, with the exception of TMA's and airspace over the North Sea. Class F is not used. Class G is used below 3500 feet, except around controlled airports, and below FL195 over the North Sea.
Class E Airspace: Controlled airspace which is neither class A, B, C nor D. In most areas of the United States, class E airspace extends from 1,200 feet (370 m) above ground level (AGL) up to but not including 18,000 feet (5,500 m) MSL, the lower limit of Class A airspace.
There are six classifications of airspace in the United States; A, B, C, D, E, and G. Class A is the most restrictive and Class G the least restrictive. They can be categorized as: Class A – 18,000 feet and higher above mean sea level (MSL).Class B – Airspace around the 40 most congested airports in the country.
Class B airspace surrounds the busiest airports from the surface to 10,000 feet MSL. The dimensions of Class B airspace vary depending on the needs of the airport. Class C airspace extends from the surface to 4,000 feet MSL.
Class C airspace is used around airports with a moderate traffic level.Class D is used for smaller airports that have a control tower. The U.S. uses a modified version of the ICAO class C and D airspace, where only radio contact with ATC rather than an ATC clearance is required for VFR operations.
Unless otherwise authorized or required by ATC, no person may operate an aircraft at or below 2,500 feet above the surface within 4 nautical miles of the primary airport of a Class C airspace area at an indicated airspeed of more than 200 knots (230 mph).
There's one more thing to keep in mind when you're operating in Class B airspace: in general, you need to be at least a private pilot to enter the airspace. Student, sport and recreational pilots can enter specific Class B airspaces, but only after they receive training and an endorsement from an instructor.
Class F. Class F is not used in the United States. In Canada, Class F is the equivalent of U.S. special use airspace including restricted and alert areas, while ICAO defines it as a hybrid of Class E and Class G, in which ATC separation guidance is available but not required for IFR operation.
Class A airspace generally begins from 18,000 feet mean sea level up to and including 60,000 feet. Operations in Class A are generally conducted under Instrument Flight Rules and primarily used by higher performance aircraft, airline and cargo operators, etc.
There are two categories of airspace or airspace areas: Regulatory (Class A, B, C, D, and E airspace areas, restricted and prohibited areas). Nonregulatory (military operations areas [MOA], warning areas, alert areas, controlled firing areas [CFA], and national security areas [NSA]).
Class C airspace areas should initially be designed as two concentric circles centered on the airport reference point. The surface area should have a 5 NM radius, and the outer limits of the airspace area should not extend beyond a 10 NM radius.
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);
Class E airspace typically extends up to, but not including, 18,000 feet MSL (the lower limit of Class A airspace). All airspace above FL 600 is Class E airspace. Uncontrolled airspace or Class G airspace is the portion of the airspace that has not been designated as Class A, B, C, D, or E.
Class E airspace rarely goes all the way to the surface, and in non-mountainous terrain, the floor of Class E airspace is typically 700 feet or 1,200 feet AGL.
The approval needed to enter Class C airspace is like Class D in that you do not need a specific clearance, but you do need to establish two-way communication with control. To be able to enter Class C airspace, a pilot must contact ATC prior to arrival.
How to get Approval to Enter Class C Airspace. The approval needed to enter Class C airspace is like Class D in that you do not need a specific clearance, but you do need to establish two-way communication with control. To be able to enter Class C airspace, a pilot must contact ATC prior to arrival.