Aircraft Operating
On Course
Assign
Examples
Degrees Magnetic
Below 3,000 feet
Any course
Any altitude
above surface
At and below FL 410
0 through 179
Odd cardinal altitude or
3,000, 5,000,
flight levels at intervals
FL 310,
of 2,000 feet
FL 330
180 through 359
Even cardinal altitude or
4,000, 6,000,
flight levels at intervals
FL 320,
of 2,000 feet
FL 340
Above FL 410
0 through 179
Odd cardinal flight levels
FL 450, FL
at intervals of 4,000 feet
490, FL 530
beginning with FL 450
180 through 359
Odd cardinal flight levels
FL 430, FL
at intervals of 4,000 feet
470, FL 510
beginning with FL 430
One-way routes
Any course
Any cardinal altitude or
FL 270, FL
(except in composite
flight level below FL 410
280, FL 290,
systems)
or any odd cardinal flight
FL 300, FL
level above FL 410
310, FL 410,
FL 430,
FL 450
Within an ALTRV
Any course
Any altitude or flight
level
In transition to/from or
Any course
Any odd or even cardinal FL 280, FL
within oceanic
flight level including
290, FL 300,
airspace where
those above FL 290
FL 310, FL
composite separation
320, FL 330,
is authorized
FL 340
In aerial refueling
Any course
Altitude blocks as
050B080,
tracks and anchors
requested. Any altitude
FL 180B220,
or flight level can be
FL 280B310
used.
Table 8-7 -- Flight direction
8-20
