Aircraft Signal Systems

Because the selection of aircraft warning devices has not, in most signal installations, provided the pilot with dependable warnings of dangerous conditions, this paper proposes that aircraft signal devices should be designed and stalled in compliance with the pilot´s requirements as expressed in three design principles. The publication describes the weaknesses of current signal devices; it recommends signal light indicators that are bright enough to be seen under direct sunlight; and it illustrates and describes an automatic dimming control that operates as a function of natural light, independent of pilot actions.