![]() Will the FMC take me automatically to this indicated altitute or do I have to enter it manually in the Autopilot? So, that's the background of why you're using either ICAO/4000, or 2000 in that box. In order to go from odd to odd, or even to even, you have to climb in 2000' increments. In an RVSM area, odd altitudes are eastbound and even altitudes are westbound. The next available altitude for eastbound travel would be F元30, and the differences between each available eastbound altitude is 4000'. That 4000' (ICAO) is there because - in a non-RVSM environment - if FL290 is eastbound, the next altitude available above it - F元10 - is westbound. Now, with better altimeters, that is reduced to 1000'. In the past, we had to separate aircraft by 2000' because of the less accurate altimeters. ![]() That 2000' is applicable in places like the United States where we use RVSM, where the aircraft is capable. STEP SIZE - 2000 means that you are using 2000' altitude separation instead. STEP SIZE - ICAO means you're using the ICAO standard of 4000' altitude separation. On the FMC I input in the ICAO = 2000 afterwards when I look the Vnav - cruise section sometimes I see a step size indicating a hight altitute. ![]()
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