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Minimum en route altitude
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Minimum en route altitude : ウィキペディア英語版
Minimum en route altitude
Minimum en route altitude (MEA),〔Spelled with a space in some FAA specs, for example, http://fsims.faa.gov/wdocs/notices/n8900_54.htm〕 alternately spelled as Minimum enroute altitude,〔For example, in the ''FAA Instrument Procedures Handbook'' (FAA-H-8261-1) it is spelled both with and without space.〕 is the lowest published altitude between radio navigation fixes that assures acceptable navigational signal coverage (see MRA) ''and'' meets obstacle clearance requirements (see MOCA) between those fixes.
The definition given here is that of the United States Federal Aviation Administration. Details may vary in other jurisdictions.
==Overview==
The MEA prescribed for a Federal airway or segment, RNAV low or high route, or other direct route applies to the entire width of the airway, segment, or route. MEAs for routes wholly contained within controlled airspace normally provide a buffer above the floor of controlled airspace consisting of at least 300 feet within transition areas and 500 feet within control areas. MEAs are established based upon obstacle clearance over terrain and man-made objects, adequacy of navigation facility performance, and communications requirements, although adequate communication at the MEA is not guaranteed. The MEA does, however, assure acceptable navigational signal coverage and meets obstacle clearance requirements between those fixes.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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