An aircraft at FL350 is required to commence descent when 85 NM from a VOR and to cross the VOR at FL80. The mean GS for the descent is 340 kt. What is the minimum rate of descent required?
The aircraft is currently at 35 000 ft and is required to cross the VOR at 8000 ft, which means that it must descend 27 000 ft in 85 NM.
With a GS of 340 kt, the aircraft will take 15 minutes to cover 85 NM (85 NM ÷ 340 kt).
Rate of Descent RoD (ft/min)= Change in Height / Time
Rate of Descent RoD (ft/min)= 27 000 ft / 15 min
Rate of Descent RoD (ft/min)= 1800 ft/min
This means that for each minute during the descent, the aircraft must lose 1800 ft of altitude.
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