AIM
AIM 4-6-2
Flight Level Orientation Scheme
Altitude assignments for direction of flight follow a scheme of odd altitude assignment for magnetic courses 000-179 degrees and even altitudes for magnetic courses 180-359 degrees for flights up to and including FL 410, as indicated in
FIG 4-6-1
.
FIG 4-6-1
Flight Level Orientation Scheme
NOTE-
Odd Flight Levels: Magnetic Course 000-179 Degrees Even Flight Levels: Magnetic Course 180-359 Degrees.
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