Visual Approach Path Indicator (VAPI) Evaluation

The Tri-color Visual Approach Path Indicator (VAPI II), as modified for improved identification, was evaluated for suitability as part of a two segment visual approach slope indicator system, and for possible incorporation into the National Airspace System. The unit was tested, using the standard Simple Abbreviated Visual Approach Slope Indicator (SAVASI) system as a control for comparison, to determine effectiveness, environmental suitability and dependability of operation. The test results lead to the conclusion that, for a number of valid reasons, the VAPI unit was markedly inferior to the SAVASI system, and should not be considered either for use in the two-segment VASI, or for inclusion within the National Airspace System.