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Noticed a bug about icing

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    Noticed a bug about icing

    Short story: PERF INIT includes ice weight into ZFW when you use the LOAD button, causing all related calculations to be wrong, despite some CDU displays correct ZFW.

    Long story:
    I flew from an icing airport to a non-icing one.
    when I was pre-flight I noticed the ZFW in FUEL menu is highlighted, and it shows 300kg more than ZFW in PAYLOAD menu.
    I continued preflight, but kept monitoring the disagreement.
    As I taxi to runway, I noticed "Icing" in PAYLOAD menu went from "none" to 1.3% then to 1.4%, maximum was 1.7%, and the disagreement between FUEL ZFW and PAYLOAD ZFW increases.
    After take off, the icing percentage immediately began to drop, but it seems to show anything less than one whole percent as "none". the disagreement between the ZFWs drops, and finally reaches zero (both PAYLOAD and FUEL shows same ZFW).

    When I was about to land I noticed something wrong with landing Vref settings. I am very used to land the plane around MLW, so I know the Vref should drop from 30/150; 40/143 to 30/149; 40/142 right at 66.7 gross weight (which is IIRC the MLW for 738).
    But it didn't. I waited on and it finally did at 66.4 gross weight.
    The 300kg difference sounded familiar so I checked the ZFW setting in PERF INIT, and sure enough, it was 300kg more than the ZFW shown in both FUEL and PAYLOAD menus (as there's zero ice now, both shows correct ZFW). However, the Gross Weight display in Landing Vref menu was correct.

    So that leads us back to the "nutshell version": PERF INIT incorrectly includes ice weight when inputting your ZFW, causing the FMC to think that your plane is heavier than it actually is.

    The aircraft involved is 737-800 but I would guess that this issue affects all MSFS PMDG 737 family.
    Ching Charng

    #2
    Did you open a support ticket with PMDG about this? If you want to report this to PMDG, the best way to do so is with a support ticket in the support portal (support.pmdg.com). If you have never opened a ticket before, you will need to create a new account there since it does not use either your forum account or your PMDG store account.

    Edit: Also, you can adjust the ZFW on the Perf Init page if it doesn't give you the value that you are expecting to see.
    Tim Lincoln
    My YouTube Channel

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    • boris.glevrk`
      boris.glevrk` commented
      Editing a comment
      Well I didn't notice that during pre-flight so (and you cannot change ZFW numbers in fuel menu)... yeah I'll open PMDG support ticket about it.

    #3
    I'm lost. I've never seen icing weight as an entry in the PAYLOAD menu, are we talking about MSFS payload or the PMDG FS Actions menu item?
    Dan Downs KCRP
    i7-10700K 32GB 3600MHz 3080Ti

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    • Want2BFlyin
      Want2BFlyin commented
      Editing a comment
      The 737 in MSFS simulates the effect of icing by increasing the aircraft's weight. In the Payload section on the MCDU there is a line entry for icing that I think usually says NONE, but will show a percentage if there is ice on the aircraft.

    • cmakris
      cmakris commented
      Editing a comment
      Not the 737. This is how MSFS simulates icing by increasing the weight of the plane. The indication in the FMC is for the user to know that icing exists...

    • Want2BFlyin
      Want2BFlyin commented
      Editing a comment
      I'm honestly not sure what its purpose is other than that it is there. I noticed it on one of my first flights and thought "huh, that's interesting," then never paid any attention to it again.

    #4
    Originally posted by DDowns View Post
    I'm lost. I've never seen icing weight as an entry in the PAYLOAD menu, are we talking about MSFS payload or the PMDG FS Actions menu item?
    When you are icing, open FUEL menu from CDU.
    Notice the ZFW is different (and highlighted) from ZFW shown in PAYLOAD (also from CDU)

    And yes there is an icing entry in PAYLOAD. right column, right above "Set empty" there's a "icing NONE or x.x%". It's not input-able but it does exist.
    Ching Charng

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