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Nondirectional Radio Beacon (NDBI - Nonprecision nondirectional <br />beacons transmit signals (low or medium frequency) that aze used by <br />the pilot of an aircraft equipped with a loop antenna to determine his <br />bearing and "home" on the NDB location. 'these facilities can be used <br />for enroute navigation and as an airport approach aid. <br />instrument Lnding~System (I~-Cl1 - A precision instrument approach <br />system consisting of a localizer (azimuth guidance), glide slope (altitude <br />guidance), marker beacons (distance guidance), and an approach light <br />system. <br />gpnroa h j„~h,L;ystem (~1_ - A system of approach lights that aze <br />configured along the extended runway centerline for a distance of up <br />to 3,000 feet; includes ALSF-1, MALS or MALSR, and SSALR. <br />Runwayf Ta=_+'way~i 'ghtin¢ -Lights having a prescribed angle of <br />emission used to define the lateral limits of a runway. These lights can <br />below intensity (LIRLLPTL.), medium intensity (MIRLMTTL), or high <br />intensity (HIRLHITL). <br />Runwa~Rnd Identifier L'-C tc (RE?L1-Two synchronized flashing light <br />groups, one on each side of the runway threshold, which provide rapid <br />and positive identification of the approach end of a particular runway. <br />Vi gal AQproa h lone Indicator (VASII - Aa airport lighting facility <br />providing vertical visual approach slope guidance to landing aircraft. <br />Precision Aonroach Path Indicator (P,~PII -This system gives more <br />precise visual indications of the approach path of the aircraft to the <br />pilots and utilizes only one set of lights, as opposed to the minimum <br />of two required by the VASI system. <br />Ai~ort Rotating Beacon - A visual NAVAID with alternating white <br />and green flashes that indicate the airport's location. <br />Automatic Te inai_ Ir formation Service (ATISI -The continuous <br />broadcast of recorded noncontrol information in selected terminal <br />areas. Its purpose is to improve controller effectiveness and to relieve <br />frequenry congestion by automating the repetitive transmission of <br />essential but routine information. <br />Automatic Directions Finder (ADFI - An aircraft radio navigation <br />system that senses and indicates the direction to an L/MF <br />nondirectionai radio beacon (NDB) ground transmitter. <br /> <br />I-41 <br />