When did the color orange enter flight test? As early as the Bell X-1, pictured here, aircraft were painted orange to enhance visibility. Later, in 1959, a study was conducted that suggested the utility of orange markings on aircraft. In 1968, the Society of Flight Test Engineers adopted a logo with "flight test orange" as its color.
There are, however, few references that explain the following:
When orange flight test equipment (wires, parts, LRUs, etc.) first appeared. For example, I transcribed a 1977 article from the SFTE's Flight Test News that sets 1949, anecdotally, as the time/event that caused Douglas to use orange wire. But it also references a Mil Spec. (Does anyone know more about the Mil Spec referred to?
When orange flight suits first appeared?