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FMC HOLD PAGE: Duration and Distance Change?

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    FMC HOLD PAGE: Duration and Distance Change?

    Hi folks,

    on my just finished flight AC709 KLGA-CYYZ I simulated to be sent into the holding pattern at LINNG.
    Inserting the 341°/LEFT on the HOLD page I wondered whether I can change the Leg duration (usually 1min) or the leg distance.
    I could input other values, however, the flight path representation did not change at all.

    Is this a known limitation of the 737NGXu?

    Thanks.
    Andre(as) Berg --- i7 8700K 12MB 3.7G. MSI Z370 Tomahawk. DDR4 16G. SSD 500G M.2. MSI RTX2080 DUKE 8G

    #2
    Yes, either leg distance or time can be changed. In general the holding fixes are charted in an arrival or approach procedure and provide this information. The fact that the magenta line rendering doesn't change means nothing.
    Dan Downs KCRP
    i7-10700K 32GB 3600MHz 3080Ti

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      #3
      Thanks, Dan, for the clarification.
      Where have I seen a much longer leg pattern?
      Standard of course is still one minute or one NM.
      Andre(as) Berg --- i7 8700K 12MB 3.7G. MSI Z370 Tomahawk. DDR4 16G. SSD 500G M.2. MSI RTX2080 DUKE 8G

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        #4
        The only difference I have seen is not a "much longer" leg pattern, but below 14000 ft MSL the distance is 1 minute and above 14000 ft MSL the distance is 1,5 minute.
        Other than that it might be specified on the charts or by ATC in each case.
        Regards, Orjan Polman.
        ENGM

        Comment


          #5
          Originally posted by 19ab67 View Post
          Thanks, Dan, for the clarification.
          Where have I seen a much longer leg pattern?
          Standard of course is still one minute or one NM.
          One NM is not really standard in commercial aviation, it'd be much too little seeing the speeds you fly in a jet.
          Longer legs are usually at higher altitudes (be sure to google the ICAO standard holdings!) or when defined by a procedure for various circumstances.

          Another occasion when we use longer legs is when holding to cover a non normal checklist, such as the engine restart in flight.
          In those cases I'd normally request 2 minute patterns to ease the passenger comfort a little. Even though they'd not even notice in IMC passengers do have a tendency to dislike long turns when they are able to see the ground.
          If I'm told I'll have to hold for a longer while I'd usually request 2 minute patterns with ATC anyway for the same reason. Whether or not they'll approve it is a different story of course, but asking doesn't cost us anything.

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            #6
            As far as I know, the presentation of a changed hold will be displayed when you enter the hold, not before. At least on the 747, 737 might be different so correct me if I am wrong.
            René Moelaert EHLE

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            • Michael Codd
              Michael Codd commented
              Editing a comment
              In the case of the B744/-8 fitted with NG FMS the Hold symbol becomes large and changes with the aircraft’s dynamics when the hold fix is the TO fix (i.e., the holding fix is MAGENTA) and the map scale is less than or equal to 80 NM.

            #7
            Originally posted by Fleng200 View Post
            As far as I know, the presentation of a changed hold will be displayed when you enter the hold, not before. At least on the 747, 737 might be different so correct me if I am wrong.
            René, that was what I noticed as well in a second trial.
            Andre(as) Berg --- i7 8700K 12MB 3.7G. MSI Z370 Tomahawk. DDR4 16G. SSD 500G M.2. MSI RTX2080 DUKE 8G

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