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Discrepancy between FMC Actual Wind and PFD wind

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    Discrepancy between FMC Actual Wind and PFD wind

    I've noticed that there's often a discrepancy between the ACTUAL WIND reported in the FMC, and the wind reported on the ND/HUD. Is this normal?

    image.png
    ND is showing winds 237/61, while FMC is showing 226/61. Is the FMC perhaps taking into account the forward speed of the aircraft while the ND doesn't? (Or maybe vice-versa?)

    Willliam D.
    Last edited by Caesar; 19Mar2023, 00:29.

    #2
    The FMC gives you true wind (based on true north), the ND gives you magnetic wind (based on magnetic north).
    Cristian Caicedo A.

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      #3
      Originally posted by ccapilot View Post
      The FMC gives you true wind (based on true north), the ND gives you magnetic wind (based on magnetic north).
      I've looked in FCOM ND symbology and display indexes and couldn't verify; does not the wind direction arrow change to true if heading/track is referenced to true north? I'm pretty sure it does but haven't been in the polar regions since last flying the big brothers.
      Dan Downs KCRP
      i7-10700K 32GB 3600MHz 3080Ti

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        #4
        Originally posted by DDowns View Post

        I've looked in FCOM ND symbology and display indexes and couldn't verify; does not the wind direction arrow change to true if heading/track is referenced to true north? I'm pretty sure it does but haven't been in the polar regions since last flying the big brothers.
        yes Dan, that is correct, but majority of the B737 do not have the polar navigation option and hence their ND always displays everything based on magnetic north, and they have a limitation on flying only outside the polar region, however if the B737 is fitted with polar navigation option and the ND changes to true north, everything will be displayed based on true north, including wind direction.
        Cristian Caicedo A.

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