INSTALLATION AND TESTING OF VISUAL GLIDE PATH INDICATORS
NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY NJ
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Flight tests were conducted to comparatively evaluate five different types of visual glide path indicators. A wide cross section of pilots from all segments of aviation participated. A cross section of aircraft was employed, from a Piper Tri-Pacer to the Boeing 707. Initial testing was directed toward selecting the more promising systems followed by concentrated testing and comparative evaluation of the selected systems. Subjective data indicate that more pilots prefer the RAE system than prefer the Cumming-Lane. All pilots but one indicated that a requirement exists, under certain conditions, for visual glide path assistance. Theodolite recordings show that no significant differences exist in the maximum range at which the lights can be seen with respect to the systems named above, or in the maximum range at which guidance is available. The RAE system, however, provides guidance to a lower altitude than does the Cumming-Lane system.