TD 48

Question 1

MIA

Answer 1

Minimum IFR Altitudes

Mountainous areas: 2,000 ft AGL above highest obstacle.
Non-mountainous: 1,000 ft AGL

4 SM horizontal for both

Question 2

MEA

Answer 2

Minimum Enroute Altitude

Lowest published altitude between radio fixes ensuring adequate obstacle clearance.

Question 3

MOCA

Answer 3

Minimum Obstacle Clearance Altitude

Lowest published altitude between VOR fixes that meet obstacle requirements.

Question 4

OROCA

Answer 4

Off Route Obstruction Clearance Altitude

Provides buffer to clear obstructions when flying off route.

Mountainous: 2,000 feet MSL
Non-Mountainous: 1,000 feet MSL

Question 5

MRA

Answer 5

Minimum Reception Altitude

Lowest altitude at which an intersection can be determined

Question 6

MCA

Answer 6

Minimum Crossing Altitude

Lowest altitude at certain fixes at which an aircraft must cross when proceeding in the direction of a higher MEA.

Question 7

MVA

Answer 7

Minimum Vectoring Altitude

Lowest mean sea level altitude at which an IFR aircraft will be vectored by a radar controller