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6/24/75 AC 150/5300-4B • provided by the existing medium intensity runway lighting system. An evaluation of each site must be made to determine which aid will best serve to reduce any deficiency(s) in a particular approach. Advisory Circulars 150/5300-2, Airport Design Standards - Site Requirements for Terminal Navigational Facilities, and 150/5340-14, Economy Approach Lighting Aids, provides additional guidance on siting and installing these visual aids a. Runway End Identifier Light System (REILS). The REILS has two flashing lights located at the end of the runway. Figure 11-3 illustrates a typical REILS installation. The intense white flashing lights provide positive runway end identification as well as a degree of circling guidance. REILS are beneficial in areas having a preponderance of lighting or where featureless terrain exists. Note, REILS are not to be installed on the same runway end as an approach light system. b. Visual Approach Slope Indicator (VASI). The VASI system has two light units normally located along the left runway edge as viewed on approach. Figure 11-2 illustrates a typical VASI installation. Each light unit emits a two-color (red and white) light beam which enables the pilot to determine whether his approach is high, on course, or low VASI installations are an integral part of the medium intensity runway light system and may be installed with either the REILS or MALS systems. VASI's are especially beneficial where: (1) visual references are lacking or are deceptive, or (2) A hazardous object must be cleared, or (3) Noise relief is desired. c. Medium Intensity Aouroach Light System (MALS). MALS may be installed with sequenced flashers,in which case it is referred to as MALSF. These are configurations of steady -burning and flashing lights arranged symmetrically about and along the extended runway centerline. Figure 11-4 illustrates a typical MALSF installation. All lights in the system emit a white light. The steady -burning lights have controlled intensities, the flashing lights do not. The system provides early runway lineup and lead-in guidance, runway end identification, and to a degree, roll guidance. They are beneficial where: Chap 11 Par 60 (1) Extraneous lighting prevents the pilot from lining up with the runway centerline, or (2) Surrounding terrain is devoid of lighting and does not provide the cues necessary for proper aircraft altitude control. Page 67