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Question about Step Climb

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    Question about Step Climb

    Hello. Normally I have auto step climb enabled and noticed that FMC wants to climb higher then optimal level.
    For now I disabled auto step climb.
    My question is, why FMC wants me to climb to FL360 when optimal altitude is FL350?
    Daviti Abesalashvili

    #2
    Probably because you fly a 180-359 heading. 1000 feet higher is not much fuel penalty but you can‘t fly an odd flightlevel in westerly directions.
    i7-6700k, GTX 1080TI, 32GB DDR4 RAM @2666MHz, 4k
    Marc Ehnle

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      #3
      I know about Flight level and direction relation but why Doesn't FMC wait until aircraft gets lighter and optimal alt gets FL360. FMC says to climb to FL360 NOW.
      I fly from EHAM to KMIA so I cruise at even Flight level.
      Last edited by elyos; 31Jul2020, 17:20.
      Daviti Abesalashvili

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        #4
        Originally posted by elyos View Post
        I know about Flight level and direction relation but why Doesn't FMC wait until aircraft gets lighter and optimal alt gets FL360. FMC says to climb to FL360 NOW.
        I fly from EHAM to KMIA so I cruise at even Flight level.
        Please note that the forum rules you agreed to upon joining include that we sign all posts with a full name.

        Because the time to climb from FL340 to FL360 is when the OPT increases from whatever it was (presumable below FL350) up to FL350. The difference between your FL340 and OPT is going to continue to increase and you will get further from OPT. The time to fly at FL360 is best when OPT is FL350-370. When it passes FL370 it will be time to step to FL380. You are keep the difference between your altitude and OPT a minimum in this manner.
        Dan Downs KCRP
        i7-10700K 32GB 3600MHz 1080Ti

        Comment


          #5
          Also note that you have inserted 2000 as STEP SIZE, so the aircraft will calculate and give you step climbs on a 2000ft size.
          Giovanni D. Tarar
          FAA CPL+IR Single & Multiengine Land
          I love flying when I'm in a bad mood

          Comment


            #6
            Real world standard technique is to do exactly what the aircraft wants. If your cruising at any level and doing 2000' steps you climb when optimum is 1000 above you present level.
            This means you will never be more than 1000' off optimum level.
            So if your at 320 when opt reaches 330 you climb 340, when opt reaches 350 you climb 360.
            If you sat at 340 until opt reached 360 for a significant time you would be almost 2000' off optimum hence why we climb at te optimum mid point.
            Darren Howie

            Comment


              #7
              Originally posted by dehowie View Post
              Real world standard technique is to do exactly what the aircraft wants. If your cruising at any level and doing 2000' steps you climb when optimum is 1000 above you present level.
              This means you will never be more than 1000' off optimum level.
              So if your at 320 when opt reaches 330 you climb 340, when opt reaches 350 you climb 360.
              If you sat at 340 until opt reached 360 for a significant time you would be almost 2000' off optimum hence why we climb at te optimum mid point.
              In the real world of SOP's the aircraft does exactly what its intelligent pilots tell it to do!
              Michael Codd

              Comment


                #8
                Originally posted by Michael Codd View Post

                In the real world of SOP's the aircraft does exactly what its intelligent pilots tell it to do!
                And ATC is the boss you have to defeat to get to the next level 👀
                i7-6700k, GTX 1080TI, 32GB DDR4 RAM @2666MHz, 4k
                Marc Ehnle

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