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Takeoff Vnav - Lnav

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    Takeoff Vnav - Lnav


    Hello everyone, I have a question, because when I arm vnav and lnav on the ground, when I take off and activate TOGA, the two switches go off in the mcp, although they remain armed, in some real videos they remain on Thanks guys
    Jose Zubillaga

    #2
    The current behaviour is correct. Green lights on mcp should disappear and remain armed on fma.

    Out of curiosity, could you link the video where the lights remained illuminated? This might be a different software standard but so far I haven't seen such.
    Matthew Chalupniczak

    Comment


      #3

      Hello, Mateo, thanks for your answer, before pressing TOGA it is on, then it goes off
      Jose Zubillaga

      Comment


        #4
        All normal. Contrary to popular flight simmers opinion the green lights on the MCP don't give information about the "status" of the AP modes (whether they're armed or not). A green light simply indicates that you can deselect the modes by pressing the button again.
        Which you can no longer do once you pressed TOGA.
        The FMA is your *only* information about active and armed AP modes.

        Comment


          #5
          Hi Jose, I also asked that once and it seems to be an airline option. Therefore in some RW videos you see other behavior.

          best regards
          Manolo Ruiz Carrió

          Comment


            #6
            Originally posted by Dzosef View Post

            Out of curiosity, could you link the video where the lights remained illuminated? This might be a different software standard but so far I haven't seen such.
            here for example:
            https://www.youtube.com/watch?v=R1dS-ZqG_Ps
            Manolo Ruiz Carrió

            Comment


              #7

              thank you manolo, exactly, this video confirms my doubt, in the pmdg present another behavior
              Jose Zubillaga

              Comment


                #8
                Originally posted by Sekkha View Post
                Interesting. You can see that the LNAV light was lit prior to departure. At some point after getting airborne, it went out, only to come back on a few seconds later. I wonder why that is.
                Originally posted by jzubillaga View Post
                thank you manolo, exactly, this video confirms my doubt, in the pmdg present another behavior
                Evidently there's different options for this, seeing as Emi is saying something completely different relative to the video, and he flies the plane for a living.
                Captain Kevin

                Kevin Yang

                Comment


                  #9
                  Originally posted by Captain Kevin View Post
                  Interesting. You can see that the LNAV light was lit prior to departure. At some point after getting airborne, it went out, only to come back on a few seconds later. I wonder why that is.
                  Indeed interesting. The LNAV light seems to come back again just the moment where the pitch mode changes from arm to active.
                  Manolo Ruiz Carrió

                  Comment


                    #10
                    Back when I used to teach systems on the 73, I used to joke that I could write a book on what happens with the FMA and MCP after pressing TOGA.
                    Loren Gogins

                    Comment


                    • jzubillaga
                      jzubillaga commented
                      Editing a comment
                      jajajajjaaj

                    • Cristi Neagu
                      Cristi Neagu commented
                      Editing a comment
                      Did you ever get around to writing it? Cause i bet it would be a pretty interesting read.

                    #11
                    Learned something today - excellent thread!

                    Mark Trainer

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