For an average case of a maximum speed used during the descent of 300 knots and a minimum zero flap speed of 210 knots, this would therefore give a correction of 9 nm. The ‘speed loss’ in the above formula is the difference between the maximum speed used during the descent and the minimum zero flap speed. (3 x height) + (1nm per 10kts of speed loss) + (1nm per 10kts of Tailwind Component) A more accurate figure is obtained using: The general formula used for calculating the distance required for descent is ‘3 times the height’, where the ‘height’ used is in multiples of thousands of feet. Calculating the Distance Required for Descent Not only is there a lot to do but the aircraft often enters busy airspace, where the radio frequencies can become rather congested. During the descent and approach the flight once again becomes rather busy.
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