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Above Ground Level (AGL) A measurement of elevation, or "height", above a specific land mass (also see MSL). International Civil Aviation Organization The ICAO is the specialized agency of the United Nations with a mandate "to ensure the safe, efficient and orderly evolution of international civil aviation."
MSL mean sea level: MSLW Max. Structural Landing Weight MSP Modes S-Specific Protocol MSSS Mode S-Specific Services MSTOW Max. Structural Take-off Weight MSZFW Max. Structural Zero Fuel Weight MTBF Mean time between failures: MTBSV Mean time between shop visit MTBUR Mean time between unscheduled removals MTOW maximum take-off weight: MTTF
Class A airspace is generally the airspace from 18,000 feet (~3.4 miles, 5.5 km) mean sea level (MSL) up to and including flight level (FL) 600 (~11.4 miles, 18.3 km), including the airspace overlying the waters within 12 nautical miles (NM) (~13.8 miles, 22.2 km) of the coast of the 48 contiguous states and Alaska. Unless otherwise authorized ...
In aviation, a control area (CTA) is "a controlled airspace extending upwards from a specified limit above the earth", not less than 200m (700 feet), although the limit does not need to be established uniformly within a control area. [1]
Airspace class Time Altitude Surface to 1200 feet AGL [b] 1200 feet AGL to 10,000 feet MSL 1200 feet AGL and above 10,000 feet MSL; Visibility [c] Clearance from clouds [d] Visibility [c] Clearance from clouds [d] Visibility [c] Clearance from clouds [d] G Day 1 [e] clear of clouds [f] 1: 500 below, 1000 above, 2000 horizontally 5: 1000 below ...
In Canada, the inner circle of the TCA is generally a 12 NM radius from the airport geographic center based at 1200 feet AGL, with an intermediate circle at 35 NM based at 2200 feet AGL, and an outer limit at 45 NM radius based at 9500 feet AGL. In Canada, the TCA is normally designated as class B, C or D. [5]
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In the United States and Canada, Victor airways are low-altitude airways. They are defined in straight-line segments, each of which is based on a straight line between either two VHF omnidirectional range (VOR) stations, or a VOR and a VOR intersection, [ 1 ] hence the beginning letter V (pronounced as Victor in the ICAO phonetic alphabet ).