Performance of Three Visual Approach Landing Light Systems

Abstract

This report documents the methodology and experimental approach taken to evaluate the effectiveness of the three visual approach landing light systems: Visual Approach Slope Indicator (VASI), Precision Approach Path Indicator (PAPI), and Pulse Light Approach Slope Indicator (PLASI). Performance measures were taken inflight in the Air Force T-37 jet trainer, which produced objective determinations of deviations from glideslope on final approach, for each system. The subjects were experienced Air Force Instructor Pilots. Results showed that PAPI and PLASI were statistically equivalent, but that both were superior to VASI. Some subjective pilot evaluations of the three systems are also described.