Minimum crossing altitude

Illustration showing how MCA is determined

In aviation, a minimum crossing altitude, or MCA, is the lowest altitude at which a navigational fix can be crossed when entering or continuing along an airway that will allow an aircraft to clear all obstacles while carrying out a normal climb to the required minimum en route IFR altitude (MEA) of the airway in question beyond the fix.

单词	Minimum crossing altitude
释义	Minimum crossing altitude 英语百科 Minimum crossing altitude In aviation, a minimum crossing altitude, or MCA, is the lowest altitude at which a navigational fix can be crossed when entering or continuing along an airway that will allow an aircraft to clear all obstacles while carrying out a normal climb to the required minimum en route IFR altitude (MEA) of the airway in question beyond the fix.
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