IFR enroute altitudes

Question 1

MEA

Answer 1

Minimum Enroute Altitude
-published altitude between NAVAID fixes
-obstacle clearance
-nav signal coverage between fixes

Question 2

MOCA

Answer 2

Minimum Obstacle Clearance Altitude
-published altitude between fixes
-obstacle clearance
-nav signal reception only within 22 knots of VOR

Question 3

COP

Answer 3

Changeover Point
-specified point to change signal reception to the next fix
-if no COP, change halfway

Question 4

MRA

Answer 4

Minimum Reception Altitude
-Minimum altitude at which an intersection can be indentified

Question 5

OROCA

Answer 5

Off Route Obstacle Clearance Altitude
-2000’ above obstacles mountains, 1000’ in not mountains

Question 6

MCA

Answer 6

Minimum Crossing Altitude
-minimum altitude to cross a fix when proceeding to a higher MEA
-for either obstacles or reception

Question 7

MAA

Answer 7

Maximum Authorized Altitude
-highest usable altitude for nav signal coverage

Question 8

MHA

Answer 8

Minimum Holding Altitude
-lowest altitude for hold
-nav signal coverage
-comms
-obstacle clearance requirements

Question 9

MVA

Answer 9

Minimum Vectoring Altitude
-for being vectored by ATC
-obstacle clearance requirements
-more than 300’ above floor of airspace

Question 10

MSA

Answer 10

Minimum Sector Altitude
-for aerodromes
-for emergencies
-1000’ above obstacles in published circle