Terms Flashcards
What is the VOR Minimum Operational Network (MON) Airports Designator?
MON Airports are designated to alert pilots to those airports that have retained ILS and VOR instrument approach procedures for safe recovery in the event of a GPS outage.
Refer to the Aeronautical Information Manual (AIM) for expanded MON Airport guidance.
What is Minimum Enroute Altitude (MEA)?
MEA is the lowest published altitude between radio fixes that assures acceptable navigational signal coverage and meets obstacle clearance requirements.
What does MEA provide in controlled airspace?
MEAs for routes wholly contained within controlled airspace provide a buffer above the floor of controlled airspace consisting of at least 300 feet within transition areas and 500 feet within control areas.
What is Minimum Reception Altitude (MRA)?
MRA is determined by FAA flight inspection and is the lowest altitude at which the navigation signal can be received for a route.
What is Maximum Authorized Altitude (MAA)?
MAA is a published altitude representing the maximum usable altitude for an airspace structure or route segment.
What is Minimum Obstruction Clearance Altitude (MOCA)?
MOCA is the lowest published altitude that meets obstacle clearance requirements and assures acceptable navigational signal coverage only within 25 statute miles of a VOR.
When is MOCA published?
MOCA is published only when it is lower than the MEA and is shown on the Enroute Low Charts preceded by an asterisk.
What is Minimum Turning Altitude (MTA)?
MTA is a charted altitude providing vertical and lateral obstruction clearance based on turn criteria over certain fixes, NAVAIDs, and waypoints.
What is Minimum Crossing Altitude (MCA)?
MCA is the lowest altitude at certain fixes at which the aircraft must cross when proceeding in the direction of a higher minimum enroute IFR altitude.
What is Off Route Obstruction Clearance Altitude (OROCA)?
OROCA is depicted on IFR Enroute Low Altitude and Pacific charts and represents the highest known terrain feature or obstruction in each quadrangle.
How is OROCA computed?
OROCA is computed with an additional vertical buffer of 1,000 feet in designated non-mountainous areas and a 2,000 foot vertical buffer in mountainous areas.
What is the purpose of OROCA?
OROCA is published for general situational awareness, flight planning, and in-flight contingency use.
