Why barometric pressure reference switches to standard pressure above the transition altitude and semicircular cruise rules.
In enroute cruising flight, all aircraft synchronize their altimeters to standard atmospheric pressure (29.92 inHg / 1013.2 hPa) to guarantee vertical separation.
Below the transition altitude, flight is conducted in 'Altitude' using local QNH. Above transition level, flight is conducted in 'Flight Levels' (FL) using 29.92 inHg / 1013.2 hPa.
The semicircular rule mandates odd flight levels (FL330, FL350) for magnetic tracks 000°-179° and even flight levels (FL340, FL360) for magnetic tracks 180°-359°.
Este artigo faz parte da biblioteca educacional FOX SIM e destina-se a fins de estudo e simulação de voo. Para operações aeronáuticas reais, consulte sempre as publicações oficiais (AIP, ROTAER, NOTAM) e manuais aprovados da aeronave.