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What are the different classes of aviation airspace?

Airspace in the US is classified into the following categories: A, B, C, D, E, and G. The airspace is ordered from Class A-Tightest control to Class G-No control. Class A airspace is anywhere from 18000 feet to flight lever 600 (approx. 60000 feet); all aircraft in class A airspace must fly IFR (instrument flight rules) and stay in contact with ATC. The required separation is also greater in class A airspace. Class B airspace surrounds larger airports, and consists of 3 or more "shelves". Class B airspace looks somewhat like an upside down wedding cake. In Class B airspace, all aircraft require a specific clearance to enter or fly through the airspace. Class C airspace Surrounds smaller airports, and looks like an upside down cake with only two layers. Aircraft entering class C airspace need only establish two way radio contact with ATC before entering. Class D airspace has the same restrictions as class C, but has only one layer. Class E airspace encompass everything from 1200 feet to 18000 feet that is not Class B, C, D, or, G. Sometimes the base elevation is lower or higher that 1200 feet, but 1200 is the normal base. Class E also encompasses everything above Flight Level 600. VFR (visual flight rules) aircraft are not required to contact ATC in class E airspace. IFR aircraft maintain ACT contact in class E. Class G airspace is uncontrolled, and usually extends to anything below 1200 feet. Even IFR aircraft do not contact ATC in class G airspace.


What are the lateral dimensions of Class D airspace based on?

The lateral dimensions of Class D airspace are based on the instrument procedures for which the controlled airspace is established.


When is a mode c transponder required?

When in class C, B or A airspace, above 10,000 feet or within any 30 nm radius Mode C veil such as the one centered on KORD in Chicago. There are some limited exceptions - see FAR 91.215


What class of airspace is acrobatic flight prohibited?

Class E airspace below 1,500 feet AGL.


When flying in the airspace underlying Class B airspace the maximum speed authorized is?

200 knots


What Normal VFR operations in Class D airspace with an operating control tower require the ceiling and visibility to be at least?

1,000 feet and 3 miles.


What the slowest speed for aircraft in Class D airspace?

I don't think there are limits to how slow an aircraft can fly in any airspace.


What does a blue circle on a Sectional Chart depicts which class airspace?

Class C for example KSRQ.


In the tower the local controller is responsible for controlling the traffic in the air and off the runway within which class of airspace?

Class D


What is the maximum indicated airspeed allowed when flying under Class B airspace?

The maximum indicated airspeed allowed when flying under Class B airspace is 250 knots. Additionally, within 4 nautical miles of the Class B airport and below 2,500 feet above the ground, the speed limit is reduced to 200 knots. These regulations help maintain safety and prevent conflicts with other aircraft operating in the busy airspace. Always check specific airspace requirements and any applicable NOTAMs for updates.


What is The vertical limit of Class C airspace above the primary airport is normally?

4,000 feet AGL.


Is TCAS required in Class A airspace?

TCAS (Traffic Collision Avoidance System) is not specifically required in Class A airspace, but it is mandated for certain types of aircraft operating under instrument flight rules (IFR) in controlled airspace. Generally, commercial airliners and larger aircraft must be equipped with TCAS to enhance safety and provide alerts about potential mid-air collisions. While smaller aircraft may not be required to have TCAS, its use can significantly improve situational awareness and safety in busy airspace.