Test and Evaluate Runway Alignment Indicator Light (Rail) for Approach Guidance

摘要

An evaluation was completed comparing the Runway Alignment Indicator Lights (RAIL) with the Medium Intensity Approach Light System (MALS) for effectiveness in providing identification and guidance as visual approach aids. The two aids were flown alternately in each available weather condition to permit comparison. The results obtained from pilot questionnaires and radar data during day and night IFR/VFR operations with weather minimums down to 3/4-mile visibility indicated the following: While the RAIL provided earlier identification and displacement information than did the MALS; the glare from the RAIL was so distracting during VFR night operations that pilots considered the RAIL unacceptable. On the other hand, the MALS was acceptable during day and night IFR/VFR operations and was rated the better approach aid during VFR night operations. It was recommended that RAIL not be approved for operational use. (Author)