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For descent planning from 15 000 feet MSL to 3 000 feet MSL, a glide path angle of 3° shall be flown. The ground speed at 15 000 feet is 180 kt, the ground speed at 3 000 feet is 150 kt.

To maintain a glide path angle of 3°, the rate of descent will:

  • A
    Be constant 900 ft/min.
  • B
    Be constant 750 ft/min.
  • C
    Be constant 825 ft/min.
  • D
    Decrease from 900 ft/min to 750 ft/min.

Rate of Descend (ft/m) = G/S (kt) x Gradient of Descend

Convert the flight path angle to a descend gradient:

Flight path angle = 3º x 100 / 60 = 5%
ROD 15 000 ft = 180 x 5 = 900 ft/min
ROD 3 000 ft = 150 x 5 = 750 ft/min

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