minimum obstacle clearance altitude


minimum obstacle clearance altitude
The lowest published altitude in effect between radio fixes on VOR (very high frequency omnidirection radio range) airways, off-airway routes, or route segments that meets obstacle clearance requirements for the entire route segment and ensures acceptable navigational signal coverage only of a VOR. In the United States and some other countries, this coverage is only within 22 NM of a VOR. It is depicted on aeronautical charts as shown in the illustration.

Aviation dictionary. 2014.

Look at other dictionaries:

  • Minimum obstacle clearance altitude — Minimum Obstacle Clearance Altitude, or MOCA, is the lowest published altitude in effect between fixes on VOR airways, off airway routes, or route segments that meets obstacle (like a building or a tower) clearance requirements for the entire… …   Wikipedia

  • Minimum en route altitude — (MEA),[1] alternately spelled as Minimum enroute altitude,[2] is the lowest published altitude between radio navigation fixes that assures acceptable navigational signal coverage (see MRA) and meets obstacle clearance requirements (see MOCA)… …   Wikipedia

  • minimum en route altitude — The lowest published altitude between radio fixes that ensures acceptable navigational signal coverage and meets the obstacle clearance requirement between those fixes. MEAs apply to the entire width of all airways or other direct routes. It is… …   Aviation dictionary

  • appropriate obstacle/terrain clearance altitude — A specified minimum published altitude that must be flown by an aircraft to ensure safe flight over an obstruction or specified terrain. These include minimum IFR (instrument flight rules) altitude (MIA), minimum en route altitude (MEA), minimum… …   Aviation dictionary

  • Minimum safe altitude — Minimum safe altitude(MSA) is a concept used in planning and executing aircraft flights. It is an altitude which allows adequate vertical clearance from nearby terrain and manmade obstacles, and allows proper navigational functions. Contents 1… …   Wikipedia

  • minimum IFR altitude — The lowest IFR (instrument flight rules) altitude established for use in a specific airspace. Depending on the airspace concerned, the minimum IFR altitude may be a minimum obstacle clearance altitude (MOCA), a minimum en route altitude (MEA), a… …   Aviation dictionary

  • 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… …   Wikipedia

  • Minimum reception altitude — In aviation, minimum reception altitude (MRA) is the lowest altitude on an airway segment where an aircraft can be assured of receiving signals from navigation aids like VOR or NDB. Typically, the greater the distance between navigation aids, the …   Wikipedia

  • minimum holding altitude — The lowest altitude prescribed for a holding pattern, which complies with requirements for obstruction clearance and ensures good reception of radio signals and of navigational aids. The minimum holding level provides a clearance of at least 1000 …   Aviation dictionary

  • Minimum enroute altitude — In aviation, Minimum Enroute Altitude (MEA) is the lowest published altitude between radionavigation fixes that assures acceptable navigational signal coverage (see MRA) and meets obstacle clearance requirements (see MOCA) between those fixes.The …   Wikipedia


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