What are the lengths of the ALS from the runway threshold? Precision instrument runway - 2400-3000' "." What is the Approach Light System (ALS) used for? Provides basic visible means to transition between instrument-guided flight into a visual approach. "." Describe the Back Course marker of an ILS? Indicates the FAF on selected back course approaches. Indicates the point where the glide slope meets the DH on a CAT II ILS approach. " Describe the Inner marker of a ILS? Between the MM and runway threshold. Usually 200ft above the touchdown zone elevation. Indicates the approximate point where the GS meets the decision height. "-" Describe the middle marker of an ILS? ~3500ft from the runway. Indicate the position atwhich the aircraft should intercept the GS at the appropriate interception altitude ±50ft. Describe the Outer marker of an ILS? 4-7 miles out. Width at the threshold is about 700 feet What is the coverage range of a localizer? 35° to each side of the centerline for the first 10NM and 10° up to 18NM from the antenna and up to an altitude of 4500° What does the glide slope of an ILS provide? Vertical course guidance What are the frequencies of the glide slope used to determine the aircraft's vertical position? 90 and 150 Hz What is the width of a full scale deflection of the glide slope? 1.4 degreesĠ.7 degrees either direction What is the range of a glide slope? Up to 10 nm What is the typical glide slope? 3 degrees What is a common error of the glide slope of an ILS? False glide slope above normal glide slope What are marker beacons on an ILS? Provide range information over specific points along the approach. DME High (DH) What does a localizer provide? Lateral course guidance What are the 2 frequencies used by a localizer to broadcast the aircraft's lateral position? 90 and 150 Hz What is the width of a full scale deflection of a localizer? Between 3-6 degrees (usually 5 degrees) When is DME slant range error negligible? Ratio of 1 nm DME to 1000' height.Įxample: Slant range is negligible at 5000' height and greater than 5 nm away from the station. ![]() When is DME slant range error most prevalent? When flying high and above the station.
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