Abstract
Effects which normally diminish the value of a manually flow instrument approach are examined in the light of flight test results with the Head-Up Display (HUD), It is possible to avoid shortsightedness (space of myopia) and disorientation phenomenon associated with poor external visibility, by choice of display position and format, allowing an efficient alternation between display and forward review. The display can also be designed to fit the man, in both static and dynamic characteristics, with benefits of rapid learning and accurate tracking. These results remove the basis for supposing man's intervention in the all-weather landing to be disastrous.