Boundaries

BOUNDARIES


ADIZ, DEWIZ and CADIZ



FIR, UIR, ARTCC or OCA boundary.



International boundary



Time zone boundary.



QNH/QNE-boundaries


ALTITUDE LIMITS AND TYPES OF CONTROL



CTR-Control Zone
ATZ-Aerodrome Traffic Zone
TIZ-Traffic Information Zone



UTA-Upper Control Area



TMA-Terminal Control Area
OCTA-Oceanic Control Area

CONTROLLED AIRSPACE


Controlled airspace shown in white.
Uncontrolled airspace shown as a tint.



Controlled airway/route.



Uncontrolled airway or advisory route.



Control Area boundary within controlled airspace (CTA, TMA).



U.S. Class B airspace. Waffle screen shows lateral limits.



Radio Frequency Sector Boundary.



Radio boundaries of control or service unit.



Boundaries within TMAs or CTAs defining different altitude limits and/or sectorizations.



U.S. special VFR weather minimums for fixed wing aircraft are not authorized within the lateral boundaries of the surface areas of Class B, Class C, Class D, or Class E airspace designated for an airport.
Australia Mandatory Traffic Area. Traffic information is exchanged while operating to or from an airport without an operating control tower within the area.



Control Zone or Aerodrome Traffic Zone (controlled).



Aerodrome Traffic Zone (no control). Aircraft broadcast intentions on standard enroute frequency, and listen on same when within such zones.
Japan Information Zone (no control) within which special VFR may be cleared by an air-ground station.



U.S. Class C airspace.



Canada Class C airspace.

ICAO AIRSPACE CLASSIFICATIONS



Airspace classification is designated by the letters (A) thru (G). Classification (A) represents the highest level of control and (G) represents uncontrolled airspace. The definitions of each classification are found in the Glossary and the Enroute sections and Air Traffic Control section of the airway manual. The airspace classification letter is displayed in association with the airspace type and vertical limits.