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Vnav not engaging

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    Vnav not engaging

    Hi all, when I press on vnav, v/s mode is engaged instead of vnav and the button isn't on green light as well. Do I have to activate anything to get vnav working? Also, the ELEC 1 and 2 under hydraulic pumps have a huge high pitch noise when I turn both on. I already have the headphone simulation and active spatial sound off but still the same.

    #2
    You have all your data set in the box, ie Perf Init etc.? That will be required before VNAV
    Paul Stakoeski

    Comment


    • Isaac Wong
      Isaac Wong commented
      Editing a comment
      Yes all are set. Speed and altitude for vnav is set in legs page as well. But the vnav just won’t turn on

    #3
    Have turned on the flight directors?
    Anders Högqvist
    AMD Ryzen 5 3600 (4.0GHz), 32 GB DDR4 3200MHz CL16, Asus RTX 2070 Super 8GB ROG STRIX

    Comment


    • Isaac Wong
      Isaac Wong commented
      Editing a comment
      Yes but only vertical line appear on FD as LNAV is engaged without VNAV

    #4
    Have you armed auto throttle?
    Anders Högqvist
    AMD Ryzen 5 3600 (4.0GHz), 32 GB DDR4 3200MHz CL16, Asus RTX 2070 Super 8GB ROG STRIX

    Comment


    • Isaac Wong
      Isaac Wong commented
      Editing a comment
      Yes they are armed

    #5
    You need to press EXEC after fill in all the data in the perf init page.
    Last edited by Predy23; 16May2022, 07:36.
    Dani Parafao

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      #6
      This is what it look likes, armed LNAV and activated perf init page
      You do not have permission to view this gallery.
      This gallery has 1 photos.

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        #7
        So the vnav activated after airborne somehow. But another issue is that the takeoff config warning keeps ringing after I hit toga button on the throttle

        Comment


          #8
          Hi Isaac, takeoff config warning can be triggered by a number of things.

          Copied from another user, who got it straight from the 737 FCOM, takeoff config warning will be given if
          • trailing edge flaps are not in the flaps 1 through 25 takeoff range, or
          • trailing edge flaps are in a skew or asymmetry condition, or have uncommanded motion, or
          • leading edge devices are not configured for takeoff or have uncommanded motion, or
          • speed brake lever is not in the DOWN position, or
          • spoiler control valve is open providing pressurized hydraulic fluid to the ground spoiler interlock valve, or
          • parking brake is set, or
          • stabilizer trim not set in the takeoff range.
          Hope this helps!

          Comment


          • Isaac Wong
            Isaac Wong commented
            Editing a comment
            Thanks, will check those later, btw I have some sharp noise when I turn on elec and the sound settings are normal

          • Raygen15
            Raygen15 commented
            Editing a comment
            Hi Isaac, without a video of what you're seeing, it would be pretty hard to tell. But switching power sources will result in a small interruption / surge of power which does do things like lights flickering / different noises, like in the real airplane!
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