Designated Airspace Handbook - Nav Canada

© 2013 Her Majesty the Queen in Right of Canada Source of Canadian Airspace Data © 2013 Transport Canada
GLOSSARY OF AERONAUTICAL TERMS AND
DESIGNATIONS OF MISCELLANEOUS AIRSPACE
1. A point on the surface of the earth over which two or more position lines intersect. The position lines may
be true bearings from NDBs (magnetic bearings shown on charts for pilot usage); radials from VHF/UHF
NAVAIDs; centrelines of airways; fixed RNAV routes or air routes; localizers or DME distances; or
2. The point where two runways, a runway and taxiway, or two taxiways cross or meet.
LOW LEVEL AIRSPACE:
All airspace within the CDA below 18,000´ ASL.
LOW LEVEL AIRWAY:
Controlled low level airspace, extending upwards from 2200 feet above the surface of the earth within the following
specified boundaries:
1. VHF/UHF airways based on VORs/VORTACs
a) The primary airway width is 4 miles on each side of the centre line prescribed for such an airway
b) Where applicable, the primary airway width shall be increased between the points where lines,
diverging 4.5° on each side of the centre line from the designated facility, intersect the primary width
boundary and where they meet similar lines projected from the other designated facility.
2. LF/MF airways based on NDBs or VHF/UHF airways based on VOR/VORTAC and NDB
a) The primary airway width is 4.34 miles on each side of the centre line prescribed for such an airway.
b) Where applicable, the primary airway width shall be increased between the points where lines,
diverging 5° on each side of the centre line from the designated facility, intersect the primary width
boundary and where they meet similar lines projected from the other designated facility.
Where the changeover point is not midway between the NAVAIDS, the airway includes the airspace between the
system accuracy lines which extend from the farthest facility, at angles of 4.5° for VHF/UHF airways, 5° for LF/MF
airways and 5° for VHF/UHF airways based on a VOR/VORTAC and NDB, to the changeover point and are joined
by lines from the nearer facility.
LOW LEVEL AIR ROUTE:
Class G Airspace, extending upwards form the surface of the earth, within the following specified boundaries:
1. Air routes based on VORs/VORTACs
a) The primary air route width is 4 miles on each side of the centre line prescribed for such an air route.
b) Where applicable, the primary air route width shall be increased between the points where lines,
diverging 4.5° on each side of the centre line from the designated facility, intersect the primary width
boundary and where they meet similar lines projected from the other designated facility.
2. Air routes based on NDBs or a VOR/VORTAC and NDB
a) The primary air route width is 4.34 miles on each side of the centre line prescribed for such an air
route.
b) Where applicable, the primary air route width shall be increased between the points where lines,
diverging 5° on each side of the centre line from the designated facility, intersect the primary width
boundary and where they meet similar lines projected from the other designated facility.
Where the changeover point is not midway between the NAVAIDS, the air route includes the airspace between the
system accuracy lines which extend from the farthest facility, at angles of 4.5° for VHF/UHF air route, 5° for LF/MF
air route and 5° for VHF/UHF air route based on a VOR/VORTAC and NDB, to the changeover point and are joined
by lines from the nearer facility.
LOW LEVEL FIXED RNAV ROUTE:
In low level airspace, a prescribed Area Navigation track between specified fixes. For routes in controlled low level
airspace, the airspace extending upwards from 2200 feet above the surface of the earth within the following
specified boundaries:
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DAH December 5, 2012 10:55 am
DESIGNATED AIRSPACE HANDBOOK
Effective 0901Z 10 JANUARY 2013 to 0901Z 7 MARCH 2013