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RFT 149: How To Fly A 3-Degree Final

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Synopsis

Every time you fly a visual or instrument approach you will be flying a nominal-3 degree flight path. This podcast covers several techniques to fly a 3-degree final approach, whether you have glide slope guidance, such as an ILS, or simply referring to visual cues.Since the glideslope on most ILS installations and the desired visual glide path is 3 degrees, we will look at ways to easily fly a 3-degree glide path. A 3-degree glide path is equal to an altitude loss of 300 feet per mile. Considering that a nominal threshold crossing height (TCH) is 50 feet, the proper glide path would be an altitude of 350 feet above ground level (AGL) at a distance of one mile from the runway, 650 feet AGL at 2 miles, and 1000 feet AGL at 3 miles (I'm a pilot, so I try to simplify things!). If you know your distance from the runway and the elevation of the airport, it's fairly easy to keep yourself on the right path. You can determine your distance from the runway using GPS, VOR/DME or visual references. The vertical speed (VS