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  1. #1
    150+ Forum Groupie Fritz's Avatar
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    mcdu perf appr - wind from different directions

    Hi,
    what do I have to insert on the MCDU PERF APPR page at arrival airport surface wind, if the wind comes from different directions?

    Thanks for the help

  2. #2
    300+ Forum Addict asessa's Avatar
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    Re: mcdu perf appr - wind from different directions

    Sorry i didn't understand your question... when you get a metar you have only 1 direction for wind
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  3. #3
    150+ Forum Groupie Fritz's Avatar
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    Re: mcdu perf appr - wind from different directions

    VRB - Variable
    Used when windspeed is less than 3KT or during a violent thunderstorm
    when wind direction can not be determined.

    You can not insert VRB on the MCDU PERF APPR page.

  4. #4
    300+ Forum Addict asessa's Avatar
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    Re: mcdu perf appr - wind from different directions

    I usually insert only the wind
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  5. #5
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    Re: mcdu perf appr - wind from different directions

    BLANK is also not a valid value for the wind direction. It must be a value between 0 and 360.
    I suppose variable (VRB) is currently not implemented.

  6. #6
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    Re: mcdu perf appr - wind from different directions

    I don't think winds have been implemented into the calculations so I leave this blank.
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  7. #7
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    Re: mcdu perf appr - wind from different directions

    you can insert the headwind...runway heading if it VRB

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    Re: mcdu perf appr - wind from different directions

    The wind is only used to calculate Vapp.
    Always use the worst case scenario. Let's say runway is 360°. Wind is given as 05015kt 010V090. In this example worst case would be 090° with 15kts because it's the full crosswind.

    As a guideline: Headwind is good, crosswind is bad, tailwind is worse.

  9. #9
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    Re: mcdu perf appr - wind from different directions

    Whatever Mag/Wind I insert in the Approach page my VAPP does not change.
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