Ifr altitudes

Question 1

DH

Answer 1

Decision height

Question 2

MAA

Answer 2

Max authorized alt

-the highest altitude that the airway can be flown with assurance of adequate navigation signals

Question 3

MCA

Answer 3

Min crossing alt

You need to climb over this waypoint bc the MEA increases on the other side

Question 4

Moca

Answer 4

Min obstruction clearance alt

-must be 22nm away from the navaid at this alt in order to get reception

Question 5

Mda

Answer 5

Min descent alt

Question 6

Mea

Answer 6

Min enroute alt
-ensures obstruction clearance (2000 agl for mountainous, 1000agl for non mount) 
AND
ensures reception to that Nav aid. 
Does NOT ensure communications

Question 7

Mora

Answer 7

Min off route alt

Question 8

Oroca

Answer 8

Off route obstruction clearance alt

• within 4nm of course
• ensures obstacle clearance 2000agl mount, 1000agl non

Question 9

Mra

Answer 9

Min reception alt

-the alt that you must be at in order to identify the waypoint using an auxiliary navaid

Question 10

Mva

Answer 10

Min vectoring alt

-must be this high for atc to give you vectors.

Question 11

Msa

Answer 11

Minimum sector (“safe”) altitude

• 1000’ obstacle clearance within 25nm of the navaid
• does not guarantee navigational reception