If I’m flying at FL200 and I want to get down to the airport at the end of my descent. The airport runway will be 0 in altitude so how do I calculate my descent.
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I love flying and when I decent I am always too high is there a certain mile that I need to decend at
there is an easy thumb rule for descents, that is important to know for pilots and ATC Controllers as well:
subtract the current altitude from the target altitude, eg
30000ft - 10000ft = 20000
divide the result by 1000 and multiply with 3 and you will get the miles
20000 : 10000 = 20 x 3 = 60 miles
so you have to start the descent 60 miles away from the point where you plan to be at 10000
descent rate is no less than 2000ft/min
speed is not higher than 280kts til 10…
Then how do I get to zero altitude how do I calculate it.
Here’s how to calculate it.
To calculate descent location, divide the number of feet you wish to descend by 1,000. If I want to descend from FL200 to 0 feet, do20,000 ft / 1,000 ft = 20Then,20 x 3 = 60 nm60 is the number of nautical miles out to begin descent.
To determine your vertical speed during descent, use your ground speed. If ground speed is 300 knots, do(300 kt / 2) x 10 = 1500 fpmYou want to descend at 1,500 feet per minute.
If you want to know how many minutes,60 nm / (300 kt / 60 min) = 12 minutes
I found using time is the easiest way to figure out. Using your example I would start descent 20 minutes from the airport at a vertical speed of - 1000, or 10 minutes from the airport at a VS of - 2000.
Since ground speed decreases as you descend, you will always come in early, so you will need to level out a bit now and then between waypoints.
I use the 3 X altitude = distance method too verify I am at the correct altitude
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