Cruise Altitude:
Another important aspect of vertical navigation is choosing a cruise altitude. We cannot simply choose any altitude that seems economical. When flying Eastbound (on a track of 0 to 179 degrees) we always use odd thousand feet altitudes (called Odd Levels). When flying Westbound (on a track of 180 to 359 degrees) we use even thousand feet altitudes (called Even Levels). This way, at least 1000 feet vertical separation is maintained between aircraft flying in opposite directions on the same airway.
Above a certain altitude, however, the required vertical separation increases to 2000 feet, so Even Levels are no longer used, but every second Odd Level is allocated for Westbound flights instead. The changover altitude is 29,000 feet for NVSM (Normal Vertical Separation Minima) and 41,000 feet for RVSM (Reduced Vertical Separation Minima, effective over Europe and the North Atlantic) operations. I've made a table for flight levels under NVSM and RVSM rules:
Direction Up to FL290
000 - 179° ODD Levels
180 - 359° EVEN Levels
Above FL290
000 - 179° 330, 370, 410, 450, 490, 530
180 - 359° 310, 350, 390, 430, 470, 510
From the above examples, you can easily calculate the nearest suitable flight level for any target altitude.
Dodnes se tou tabulkou řídím, i když v reálu je možné mít i sudé hladiny. Navíc se to opravdu liší stát od státu.
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