An aircraft descends from 7500 ft with a rate of descent of 500 ft/min to land at an airfield at sea level. If the mean descent groundspeed is 85 kt, what is the distance from the airfield at which the descent must be started to arrive overhead at 1000 ft?
1. Calculate the altitude difference during the descent:
- 7500 ft - 1000 ft = 6500 ft
2. Calculate the time to descent:
- 6500 ft ÷ 500 ft/min = 13 minutes or (13/60) 0.216 hr
3. Calculate the distance covered during descent:
- Distance = Mean GS x Time
- Distance = 85 kt x 0.216 hr = approximately 18 NM
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