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ICAO

ICAO Airspace Classification

Most countries are member of the International Civil Aviation Organization (ICAO) and as such have signed the "Chicago Convention 1944" (111 pages, 2 Mb). Aviation rules and regulations in member countries are based on the recommendations of the ICAO.

ICAO Annex 11: Air Traffic Services, Chapter 2, Section 2.6 describes the classifications of airspaces classes A - G and the services the pilot may expect from air traffic control. The table below shows this in a more comprehensible form.

Airspace Separation & Services

ICAO Airspace classes A - G are listed below:

ICAO Airspace Classification
Class  Flight Rules Separation Service Provided Speed Limit Communication Required ATC Clearance
A IFR only All Aircraft Air Traffic Control Not applicable Two way Yes
B IFR All Aircraft Air Traffic Control Not applicable Two way Yes
VFR All Aircraft Air Traffic Control Not applicable Two way Yes
C IFR IFR from IFR, IFR from VFR Air Traffic Control 250 kts below 10000ft Two way Yes
VFR VFR from IFR ATC and Traffic Information 250 kts below 10000ft Two way Yes
D IFR IFR from IFR Air Traffic Control, Traffic Info about VFR flights 250 kts below 10000ft Two way Yes
VFR nil IFR/VFR and VFR/VFR Traffic Information 250 kts below 10000ft Two way Yes
E IFR IFR from IFR Air Traffic Control, Traffic Info as far as practicable about VFR flights 250 kts below 10000ft Two way Yes
VFR nil Traffic Information as far as practicable 250 kts below 10000ft No No
F IFR IFR from IFR as far as practicable Air Traffic Advisory, Flight Information Service 250 kts below 10000ft Two way No
VFR nil Flight Information Service 250 kts below 10000ft No No
G IFR Nil Flight Information Service 250 kts below 10000ft Two way No
VFR nil Flight Information Service 250 kts below 10000ft No No

Based on: ICAO Annex 11: Air Traffic Services, Chapter 2, Section 2.6 and Appendix 4

Remember that each country can apply changes to the standard ICAO airspace classification, be sure to read the relevant AIP.

Written by EAI.


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