Head-up displays are gaining a prominent role on airline as well as business jet flight decks, as carriers exploit low-visibility guidance systems and corporate operators embrace "enhanced vision." HUD technology—originally developed for combat jets—found its way onto commercial flight decks in 1989 when Alaska Airlines pioneered the use of head-up systems (AW&ST Oct. 30, 1989, p. 13). Flight Dynamics' head-up guidance system (HGS) enabled Alaska 727-100 pilots to hand-fly Category 3A approaches, which allow operations with visibility as low as 700 ft. runway visual range (RVR) and a 50-ft. decision height.
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