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How does HGS or HUD work ?

  •  10-24-2005, 11:26 PM

    How does HGS or HUD work ?

    Please can anybody tell me how the Heads Up Display in an airliner know where the runway is situated so that it can "paint" a representation of the runway on the screen ?

    Does the HUD calculate the position from GPS data ?
    What is involved in certifying an existing HGS system for landings in a country where the HGS is not previously certified ?

    Also can Infra Red be overlaid on older HGS systems or must one purchase an entirely new HUD system for I/R ?
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