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How to set the GlideSlope value in 747

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    How to set the GlideSlope value in 747

    Hi all,
    I wanna know how to set the GlideSlope value in 747 since in some airport the GlideSlope value is not 3.00
    Thanks

    Tieyuan Sun

    #2
    You can't and you can't on the real aircraft either. The glideslope angle is a function of the airfield's ground based ILS installation and it is automatically detected by the aircraft's AP/FD system when you are using it as an approach and landing aid.
    Michael Codd

    Comment


      #3
      Originally posted by Tieyuan Sun View Post
      Hi all,
      I wanna know how to set the GlideSlope value in 747 since in some airport the GlideSlope value is not 3.00
      Thanks

      Tieyuan Sun
      Fine, got it.
      Thanks.

      Tieyuan Sun

      Comment


        #4
        In the 737 you can set it for the HGS, but that concerns only the HUD visor. The FMS/Navaid systems still work with the signal received from the ground.
        Except for the 737 with the HGS, no other Boeing airplane have a way to insert the GS value (I don't know about the 787 though).
        Giovanni D. Tarar
        FAA CPL+IR Single & Multiengine Land
        I love flying when I'm in a bad mood

        Comment


        • Michael Codd
          Michael Codd commented
          Editing a comment
          If I understand what you are saying correctly, are you absolutely sure you can vary the angle of a TRANSMITTED ILS G/P signal in the HUD? I can understand why you might want to set a glidepath value when not using an ILS for an approach, but I find it very hard to believe you can modify it when actually using an ILS.

        • DDowns
          DDowns commented
          Editing a comment
          I suspect that the HGS values entered for runway elevation, length and GS angle are used somehow in the AIII logic. The glideslope angle is set by the GS ground equipment and nothing in the aircraft affects that.

        • CBT_Phoenix
          CBT_Phoenix commented
          Editing a comment
          Yeah what I meant was that the GS angle you set for the HGS concerns only some features of the HGS (I don't know which one), but it doesn't affect the way the airplane receives/follows the actual GS from the ground station. As Dan said, is probably something to do with the AIII logic, but is not something crucial for the approach. If you don't set the values in the HGS, you can still fly the approach safely using "only" all the main instruments.

        #5
        Originally posted by CBT_Phoenix View Post
        In the 737 you can set it for the HGS, but that concerns only the HUD visor. The FMS/Navaid systems still work with the signal received from the ground.
        Except for the 737 with the HGS, no other Boeing airplane have a way to insert the GS value (I don't know about the 787 though).
        You cant in the 787 either...and you cant alter the glidepath angle off 3 degrees in the 787 either..
        Darren Howie

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          #6
          Originally posted by dehowie View Post

          You cant in the 787 either...and you cant alter the glidepath angle off 3 degrees in the 787 either..
          Cool! So it's not like the 737 that needs a configuration of the HGS prior to the approach?
          Giovanni D. Tarar
          FAA CPL+IR Single & Multiengine Land
          I love flying when I'm in a bad mood

          Comment


            #7
            Originally posted by CBT_Phoenix View Post

            Cool! So it's not like the 737 that needs a configuration of the HGS prior to the approach?
            Absolutely not and you can still use the HUD. Setting up that little HGS panel is for AIII (CATIII) approaches only, and I rarely fly those. I'll fly one visually once in awhile for proficiency but I might have one or two CAT II in a year, fewer CAT III, and I flight sim almost every day. I usually set up NAV2 for the missed approach.
            Dan Downs KCRP
            i7-10700K 32GB 3600MHz 1080Ti

            Comment


              #8
              Originally posted by DDowns View Post

              Absolutely not and you can still use the HUD. Setting up that little HGS panel is for AIII (CATIII) approaches only, and I rarely fly those. I'll fly one visually once in awhile for proficiency but I might have one or two CAT II in a year, fewer CAT III, and I flight sim almost every day. I usually set up NAV2 for the missed approach.
              That's one new thing I've learned today. I rarely fly CATIII as well, usually only if I haven't flown that specific aircraft for a while, just to not hammer the wheels on touchdown.
              Well, thank you. It's surely something that will come useful 😊
              Giovanni D. Tarar
              FAA CPL+IR Single & Multiengine Land
              I love flying when I'm in a bad mood

              Comment

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