Controlled Airspace

A controlled airspace within the Northern Domestic Airspace (NDA) at FL 230 and above.

A controlled airspace of defined dimensions extending upwards from the surface of the earth up to and including 3,000 feet AAE unless otherwise specified.

A controlled airspace of defined dimensions normally established in the vicinity of a military aerodrome and within which special procedures and exemptions exist for military aircraft. The terminology (Class B, C, D or E equivalent) used for the designations of MTCAs describes the equivalent level of service and operating rules for civilian aircraft operating within the MTCA and under military control.

The lowest IFR altitude established for use in a specific airspace. Depending on the airspace concerned, the minimum IFR altitude may be a minimum obstacle clearance altitude (MOCA), a minimum en route altitude (MEA), a minimum sector altitude (MSA), a minimum vectoring altitude (MVA), a safe altitude 100 NM, an area minimum altitude (AMA), a transition altitude or a missed approach altitude. The minimum IFR altitude provides obstacle clearance but may or may not be within controlled airspace.

A controlled airspace of defined dimensions within the low-level airspace (LLA), extending upwards from 2,200 feet AGL unless otherwise specified.