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An aircraft is currently at 1000 ft. If it needs to climb to 3500 ft over a distance of 15 NM while maintaining a groundspeed of 88 knots, what rate of climb in ft/min is necessary?

  • A

    Approximately 250 ft/min.

  • B

    Approximately 280 ft/min.

  • C

    Approximately 320 ft/min.

  • D

    Approximately 400 ft/min.

First, calculate the altitude to gain:

  • Altitude to gain = 3500 ft - 1000 ft = 2500 ft

Convert distance and speed to time:

We know:

  • Time = Distance ÷ Groundspeed
    Time = 15 NM ÷ 88 kt = 0.17045 h

Convert hours to minutes:

  • 0.17045 h x 60 = 10.23 minutes

Calculate required rate of climb:

Rate of Climb (RoC) is:

  • RoC = altitude gain ÷ time
    RoC = 2500 ft ÷ 10.23 min = 244.4 ft/min

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