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18 maj 2020 · Here's how to calculate the top of descent quickly: take your current altitude, subtract the airport elevation, or traffic pattern altitude. Multiply that number by 3 to get the distance from the airport.
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16 paź 2021 · Two conditions need to be determined to descend at a three-degree glideslope and arrive at your intended waypoint at the correct altitude: Top of Descent; Rate of Descent; Determining Top of Descent. The first step to simply calculating your descent is determining where it should begin, known as the “Top of Descent” (TOD).
11 lut 2017 · How far out should you start your descent? You're flying at 5,000' MSL, going 90 knots groundspeed, and you need to descend to a pattern altitude of 2,000' MSL. You plan to descend at 500 feet per minute.
Using this rate in feet/min, you can easily calculate the top of descent time. Time_before_arrival (min) = (Altitude to loose /descent_rate (ft/min) Example: An aircraft is at 3500ft and I need to join the aerodrome circuit at 1500ft.
The top of descent is usually calculated by an on-board flight management system, and is designed to provide the most economical descent to the approach altitude. This diagram is also applicable for VFR flights. You can replace the approach fix by a VFR entry point, landmark or over airfield altitude.
9 maj 2018 · My mnemonic for top of descent is simply "4" times the nr. of thousand feet to descend and it gives me the distance in miles from the destination airfield. In this example it is 9 (for 10,000'- 1,000'= 9,000') times 4 = 36 (miles).
20 maj 2024 · Calculate the required distance needed to descend to that waypoint with a standard descent angle of 3°. We can use the FlyByWire flyPad in the cockpit or a simple rule of thumb calculation (details below). Use the MCDU PROG page's DIST function to read out the current distance to this waypoint.
