The minimum safety altitude for IFR flight refers to the highest point 25km along each side of the airway. MSA should not be below _______ m in plain areas.
A.300
B.400
C.500
D.600
正确答案是B
The minimum safety altitude for IFR flight refers to the highest point 25km along each side of the airway. MSA should not be below _______ m in plain areas.
A.300
B.400
C.500
D.600
正确答案是B