Instrument key words Flashcards
Federal Airway System
The primary means for routing aircraft operating under IFR.
Federal airways
Class E airspace areas that extend upward from 1,200 feet to, but not including, 18,000 feet MSL unless otherwise specified.
Victor Airways
Airways based on a centerline that extends from one VOR or VORTAC navigation aid or intersection, to another navigation aid (or through several navigation aids or intersections); used to establish a known route for en route procedures between terminal areas.
Jet route
A route designated to serve flight operations from 18,000 feet MSL up to and including FL 450.
Area navigation (RNAV)
Allows a pilot to fly a selected course to a predetermined point without the need to overfly ground-based navigation facilities, by using waypoints.
En route high altitude charts
Aeronautical charts for en route instrument navigation at or above 18,000 feet MSL.
En route low altitude charts
Aeronautical charts for en route IFR navigation below 18,000 feet MSL.
Minimum en route altitude (MEA)
The lowest published altitude between radio fixes that ensures acceptable navigational signal coverage and meets obstacle clearance requirements between those fixes.
Minimum obstruction clearance altitude (MOCA)
The lowest published altitude in effect between radio xes on VOR airways, off-airway routes, or route segments, which meets obstacle clearance requirements for the entire route segment and which ensures acceptable navigational signal coverage only within 25 statute (22 nautical) miles of a VOR.
Minimum reception altitude (MRA)
The lowest altitude at which an airway intersection can be determined.
Minimum crossing altitude (MCA)
The lowest allowed altitude at certain fixes an aircraft must cross when proceeding in the direction of a higher minimum en route altitude (MEA).
Maximum authorized altitude (MAA)
A published altitude representing the maximum usable altitude or fight level for an airspace structure or route segment.
