I have an issue. So lets say i’m going to plan a flight, and I calculate the approach distance using http://www.freedomair.us/DescentCalc/descentdistance.php . Whenever I start the approach at the correct time, I always go completely over the airport. It totally misses the airport. For example, lets say I am flying from Houston to Los Angeles. I would set the altitude at which i will start descending, The descent speed, target altitude (usually 2000 feet above runway), and the descent rate, as shown below.
So once i am 43 miles away from the airport and I am at 140 knots, I start to descent to 2128 feet at 1500 f/m. When I do this, I totally overshoot the airport by a thousand feet or so. Does anyone know what i’m doing wrong? Please help because I want to make good and easy approaches. I feel like i’m following the directions, but its just not fitting together.