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VNAV Help

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    VNAV Help

    Can someone tell me the variables that must be entered into FMS for the VNAV function to work? I use PFPX and import the COROUTE no issue that has the LNAV data in the route but when I engage LNAV it will not work. Thanks
    Chris Chiozza
    B737 NGX
    B747 QOTSII
    B777

    #2
    Originally posted by cchiozza View Post
    Can someone tell me the variables that must be entered into FMS for the VNAV function to work? I use PFPX and import the COROUTE no issue that has the LNAV data in the route but when I engage LNAV it will not work. Thanks
    Please note that PMDG asks us to sign our full name on all posts in their forum.

    You ask about VNAV then say LNAV is not working. Have you reviewed the Introduction document and flown both of the tutorials? Very important information to be gained.
    Dan Downs KCRP

    Comment


      #3
      Yes I have completed the tutorial and thats my confusion. LNAV seems to work and then not which is why I think it is obviously something I am not doing.

      Chris Chiozza
      Chris Chiozza
      B737 NGX
      B747 QOTSII
      B777

      Comment


        #4
        Please describe the case where LNAV does not arm for you. For example, before takeoff?
        Be aware that if the first waypoint is more than a specified heading change, like 30 deg maybe, then LNAV will not arm. You should be using HDG is that case.
        Dan Downs KCRP

        Comment


          #5
          Yes it was before takeoff I will check the HDG. What if the VNAV will not engage after takeoff and on the flightplan and you manually enter a ALT on decent?
          Chris Chiozza
          B737 NGX
          B747 QOTSII
          B777

          Comment


            #6
            Originally posted by cchiozza View Post
            Yes it was before takeoff I will check the HDG. What if the VNAV will not engage after takeoff and on the flightplan and you manually enter a ALT on decent?
            This is pretty routine stuff: Depart on a heading from ATC (or the ATC in your head, which is the only ATC I use). After leaving airport traffic area change heading towards first waypoint. Do a GO TO for the first waypoint (press the 1L LSB twice and click EXEC).... this sets up the LNAV to track to that waypoint. Change from HDG to LNAV.

            You should have no problems engaging LNAV once you are enroute to the first fix. You can take off HDG/VNAV... don't need LNAV on departure for VNAV to work; however, some B737 operators don't engage VNAV until flaps up. It varies. Having a simulator lets you play with the different methods.

            Chris, I recommend you had a signature to your profile to make adding your full name automatic for you. Full name on all posts here.
            Dan Downs KCRP

            Comment


              #7
              Ok, I will add the signature. I was looking for that. I will give it another go. Thanks for the help.

              Chris Chiozza
              Chris Chiozza
              B737 NGX
              B747 QOTSII
              B777

              Comment

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