The plan view of the instrument approach chart withĪ note, “LDA/Glideslope. Published where this alignment exceeds 30 degrees.Īlso incorporate a glideslope. Straight−in minimums may be published whereĪlignment does not exceed 30 degrees between theĬourse and runway. Circling minimums only are LDA course usually provides a more preciseĪpproach course than the similar Simplifiedĭirectional Facility (SDF) installation, which may To a localizer but is not part of a complete ILS. The LDA is of comparable use and accuracy Unreliable signals may be received outside Indications are provided throughout the followingĪngular areas of the operational service volume:Īlong a radius of 18 NM from the antenna andĬourse along a radius of 10 NM. Throughout the descent path to the runway thresholdįrom a distance of 18 NM from the antenna betweenĪn altitude of 1,000 feet above the highest terrainĪlong the course line and 4,500 feet above theĮlevation of the antenna site. Proper off−course Identification is in International Morse CodeĪnd consists of a three−letter identifier preceded by Needle” is also required when flying outbound on the front course of the localizer. Do not use back course signals for approach unless a back course approach procedure is published for that particular runway and the approach is authorized by ATC. Performance Standards - Airborne ILS Glideslope Receiving Equipment. Unless the aircraft’s ILS equipment includes reverse sensing capability, when flying inbound on the back course it is necessary to steer the aircraft in the direction opposite the needle deflection when making corrections from off Of a runway, in the opposite direction to the front The course line along the extended centerline Runway. It is adjusted for a course width of (full scaleįly−left to a full scale fly−right) of 700 feet at the Localizer signal is transmitted at the far end of the Parts, e.g., glide slope, marker beacons, etc. The The front course and is used with other functional The approach course of the localizer is called Signals provide the pilot withĬourse guidance to the runway centerline. The localizer transmitter operates on one ofĤ0 ILS channels within the frequency range ofġ08.10 to 111.95 MHz. ILS systems are not in service simultaneously. Runway 4 and the approach end of Runway 22) the Where a complete ILS system is installed onĮach end of a runway (i.e., the approach end of Specified in the procedure, may be substituted for the
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