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Given the following information, calculate the ground distance required to reach FL60 in the descent.

Top of Descent: FL150
Rate of Descent: 1200 ft/min
TAS: 150 kt
Wind component: 35 kt headwind

  • A

    19 NM

  • B

    23 NM

  • C

    14 NM

  • D

    10 NM

1. Calculate the altitude difference:

  • From FL150 to FL60 = 15 000 ft - 6000 ft = 9000 ft

2. Calculate the time to descend:

  • Time = Altitude difference / Rate of descent = 9000 ft / 1200 ft/min = 7.5 minutes

3. Calculate the groundspeed:

  • TAS = 150 kt
  • Headwind = 35 kt
  • Groundspeed = TAS - Headwind = 150 kt - 35 kt = 115 kt

4. Calculate the ground distance:

  • Ground distance = Groundspeed x Time = 115 kt x (7.5 / 60) hours = 14 NM

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