![]() ![]() It is not the same as an unusable route segment depicted with zigzag symbol over its length to say it’s no longer IFR-usable. MEAs are used only by the U.S., Canada, and a few other countries.Īn MEA gap is a route segment with a gap in navigational signal coverage. If only one altitude is published, it is both MEA and MOCA. There can also be minimum descent values. ![]() They can be different in opposite directions due to minimum climb gradients going one way or the other. RNAV MEAs are usually lower than VOR altitudes. MEAs are established based on obstacle clearance, adequate navigation facility performance, and communications requirements. ![]() MEAs for routes wholly within controlled airspace typically provide a buffer above the floor of controlled airspace consisting of at least 300 feet in transition areas and 500 feet in control areas. The Minimum En route Altitude is the lowest published altitude between fixes that assures adequate navigational signal coverage and meets obstacle clearance requirements between those fixes. Every Victor airway’s usable altitude envelope extends from the base at the MEA or MOCA to the top at 17,999 feet. The FAA sets altitudes once they determine that the navaids are adequate, provide acceptable signal coverage, and that aircraft can remain within proper route widths. MEAs, MOCAs, MRAs, and MCAs on en route charts are altitudes stated in Part 95. Further, 91.177 says that no one may operate an IFR aircraft below the applicable minimum altitudes in Part 95. Part 95 covers altitudes governing IFR operation on Federal airways, jet routes, RNAV routes, and other direct routes with an MEA. How many en-route minimum altitude types are there? If you said anything other than a dozen, better read on. After all, if you go lower, you might hit something. But, if you’re like most of us, you’ve forgotten a lot of that. Some time ago, you studied the FAA’s charts and learned all of the symbology and the various altitude restrictions like MEA, MOCA, MCA, and probably MRA and others. ![]()
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