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In aviation, atmospheric sciences and broadcasting, a height above ground level (AGL [1] or HAGL) is a height measured with respect to the underlying ground surface.This is as opposed to height above mean sea level (AMSL or HAMSL), height above ellipsoid (HAE, as reported by a GPS receiver), or height above average terrain (AAT or HAAT, in broadcast engineering).
The innermost ring with a radius of 5 nautical miles (9 km) typically extends from the surface area around the airport to 4,000 feet (1,220 m) AGL (above ground level; charted in MSL), and an outer ring, with a radius of 10 nautical miles (19 km) that typically surrounds the inner ring and extends from a floor at 1,200 feet (370 m) AGL, (also ...
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 ...
Class B airspace extends from the surface up to 10,000 ft. AGL and is the area above and around the busiest airports (e.g., LAX, MIA, CVG) and is also heavily controlled. A side view of Class B airspace resembles an upside-down wedding cake with three layers becoming bigger toward the top.
Thus, one may see only external borders within the chart, with the 1,200-foot (370 m) region extending off the chart. When class E airspace begins at altitudes other than 1,200 feet (370 m) AGL, 700 feet (210 m) AGL, or 14,500 feet (4,400 m) MSL, a delimiting border resembling links in a chain in dark cyan separates the areas, and specific ...
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
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The airspace is commonly depicted as resembling an "upside-down wedding cake". The innermost ring extends from the surface area around the airport to typically 10,000' MSL . Several outer rings usually surround it with progressively higher floors to allow traffic into nearby airports without entering the primary airport's Class B airspace.