MEA, MSA, MORA ETC Flashcards
MORA GRID MINIMUM OFF ROUTE ALT
LIGHT GREEN LESS THAN 14,000. MAROON IF GREATER
CLEAR OBSTRUCTIONS BY 1,000 FT. IN AREAS WHERE THE HIGHEST ELEVATIONS ARE 5,000 OR LOWER. CLEAR ALL TERRAIN BY 2,000 FT. WHERE HIGHEST ELEVATION IS 5001 AND HIGHER. PROVIDE AN OBSTACLE CLEARANCE ALTITUDE WITHIN A LATITUDE AND LONGITUDE GRID BLOCK USUALLY ONE DEGREE BY ONE DEGREE. THE PRESENTED IN FT. OMITTING THE LAST TOW FIGURES.
MORA ROUTE MINIMUM OF ROUTE ALT
1,000FT. ALTITUDE ABOVE
2,000 IN MOUNTAINOUS IN AREAS OF CHANGING TERRAIN EXCEED 3,000FT. WITHIN 10 NM ON BOTH SIDES OF AIRWAYS.
MEA MINIMUM ENROUTE ALT
PRINTED IN RED
OBSTRUCTION, NAVIGATION BUT POSSIBLY NO COMMUNICATION
1,000 and 2,000 mtn
- PROPER RECEPTION OF NAVIGATION
- TWO WAY COMMUNICATION NOT GUARANTEED WITH ATC
- SAFE CLEARANCE FROM OBSTACLES
- ADHERENCE TO ATC OR LOCAL PROCEDURES
MSA MINIMUM SECTOR ALT
1,OOO FT. CLEARANCE WITHIN 25 MI OF NAVAID. POSSIBLY NO NAVIGATION. DIDN’T SEE ANYTHING ABOUT 2,000 IN MTN.
MOCA MINIMUM OBSTRUCTIN CLEARANCE ALT
VOR RECEPTION WITHIN 22MI is the lowest published altitude in effect between fixes on VOR airways or route segments that meets obstacle clearance.
1,000ft. and 2,000 mtn.
MCA MINIMUM CROSSING ALT
IS RELATED WITH SIGNAL RECEPTION AND OBSTACLE CLEARANCE THIS WILL BE INDICATED BY A FLAGGED X ON NOS AND JEPP CHARTS AS AN AIRWY NUMBER AND ALTITUDE. THE PILOT SHOULD CLIMB TO THE MCA BEFORE REACHING THE INTERSECTION.
MVA MINIMUM Vectoring Altitude named
Minimum Flight Altitude (MFA), Minimum Radar Vectoring Altitude (MRVA) or ATC Surveillance Minimum Altitude (ASMA).
1,000 AND 2,000 MOUNTAINOUS
The Minimum Vectoring Altitude named MVA is the lowest altitude, expressed in feet AMSL, to which a radar controller may issue aircraft altitude clearances during vectoring/direct routing except if otherwise authorized for radar approaches, departures and missed approaches.
In some sources this altitude is also referred to as Minimum Flight Altitude (MFA), Minimum Radar Vectoring Altitude (MRVA) or ATC Surveillance Minimum Altitude (ASMA). The minimum vectoring altitude in each sector provides 1000ft above the highest obstruction in non- mountainous areas and 2000ft above the highest obstacle in designated mountainous areas.
OROCA OFF ROUTE OBSTRUCTION CLEARANCE ALT.
1,000 AND 2,000 MTN
An off-route obstruction clearance altitude (OROCA) is an off-route altitude that provides obstruction clearance with a 1,000 foot buffer in non-mountainous terrain areas and a 2,000 foot buffer in designated mountainous areas within the United States. This altitude may not provide signal coverage from ground-based NAVAIDs, ATC radar, or communications coverag
MRA MINIMUM RECEPTION ALT.
Minimum Reception Altitude (MRA) is determined by FAA flight inspection traversing an entire route of flight to establish the minimum altitude the navigation signal can be received for the route and for off-course NAVAID facilities that determine a fix. When the MRA at the fix is higher than the MEA, an MRA is established for the fix and is the lowest altitude at which an intersection can be determined
MAA MAXIMUM AUTHORIZED ALT
Maximum Authorized Altitude is a published altitude representing the maximum usable altitude or flight level for an airspace structure or route segment.
MTA MINIMUM TURNING ALT
Minimum Turning Altitude (MTA) is a charted altitude providing vertical and lateral obstruction clearance based on turn criteria over certain fixes, NAVAIDs, waypoints, and on charted route segments. [Figure 2-59] When a VHF airway or route terminates at a NAVAID or fix, the primary area extends beyond that termination point.
How do you identify an MEA on an enroute chart?
Answer:
MEAs are printed in red and simply show the MEA altitude along an airway.
MVA MINIMUM VECTORING ALT
Answer:
Minimum Vectoring Altitudes (MVA) are established for use by ATC when radar ATC is exercised. Each sector boundary is at least 3 miles from the obstruction determining the MVA. To avoid a large sector with an excessively high MVA due to an isolated prominent obstruction, the obstruction may be enclosed in a buffer area whose boundaries are at least 3 miles from the obstruction.
MOA
MOAs are established for the purpose of separating certain non – hazardous military activities from IFR traffic may be cleared through the MOA if IFR separation can be provided by ATC. Otherwise, ATC reroutes traffic.
Where can you find a minimum crossing altitude on an enroute chart?
L MCAs are found underneath officially named intersections and may include direction for flights. Example; LOMAS MCA FL 60 SE indicates an MCA of 6,000 feet for SE bound flights only off an intersection name LOMAS.
