![]() ![]() it only works in the front-course 180 degree arc). This is an issue in the UK at least because generally missed approaches will use the ILS DME and we also we have some airports that have an ILS only to one runway end but use the associated DME in an NDB/DME approach to the other end. ![]() The localizer course is very narrow, normally 5°.The DME stops as you cross the thresholdīuild Version # when you first started experiencing this issue.įly past the runway threshold at an airport with an ILS only at one end but with no back-course (e.The correct function should be the DME element works throughout 360 degrees as it broadcast on a separate but linked frequency to the ILS.ĭetail steps to reproduce the issue encountered: Humberside even includes a DME arc based off an ILS DME which is impossible to fly in the sim using Navigraph navdata: Examples would include Southampton (EGHI) and Humberside (EGNJ). With this course width, a full-scale deflection shows when the aircraft is 2.5° to either side of the centerline. This sensitivity permits accurate orientation to the landing runway. Glide Slope. Glide slope (GS) describes the systems that generate, receive, and indicate the ground facility radiation pattern.With no more than one-quarter scale deflection maintained, the aircraft will be aligned with the runway. The course projected by the glide-slope equipment is essentially the same as would be generated by a localizer operating on its side.The glide-slope equipment is housed in a building approximately 750 to 1,250 feet down the runway from the approach end of the runway, and between 400 and 600 feet to one side of the centerline.The glide path is the straight, sloped line the aircraft should fly in its descent from where the glide slope intersects the altitude used for approaching the FAF, to the runway touchdown zone. The glide-slope projection angle is normally adjusted to 2.5° to 3.5° above horizontal, so it intersects the MM at about 200 feet and the OM at about 1,400 feet above the runway elevation. Unlike the localizer, the glide-slope transmitter radiates signals only in the direction of the final approach on the front course.At locations where standard minimum obstruction clearance cannot be obtained with the normal maximum glide-slope angle, the glide-slope equipment is displaced farther from the approach end of the runway if the length of the runway permits or, the glideslope angle may be increased up to 4°. The system provides no vertical guidance for approaches on the back course. Marker Beacons. Two VHF marker beacons, outer and middle, are normally used in the ILS system.Īt 10 NM from the point of touchdown, this represents a vertical distance of approximately 1,500 feet, narrowing to a few feet at touchdown.A third beacon, the inner, is used where Category II operations are certified. The OM is located on the localizer front course 4 to 7 miles from the airport to indicate a position at which an aircraft, at the appropriate altitude on the localizer course, will intercept the glide path The MM is located approximately 3,500 feet from the landing threshold on the centerline of the localizer front course at a position where the glide-slope centerline is about 200 feet above the touchdown zone elevation.Ī marker beacon may also be installed to indicate the FAF on the ILS back course.The inner marker (IM), where installed, is located on the front course between the MM and the landing threshold. It indicates the point at which an aircraft is at the decision height on the glide path during a Category II ILS approach. The back-course marker, where installed, indicates the back-course FAF. ![]()
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