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Given:

PA Direction Speed
0 ft 260° 25 kt
3 000 ft 260° 30 kt
6 000 ft 270° 35 kt
9 000 ft 270° 40 kt
12 000 ft 280° 50 kt
15 000 ft 285° 55 kt
18 000 ft 290° 55 kt

Which of the following is the correct wind used for a descent from FL180 to ground level?

  • A
    270°/35 kt
  • B
    270°/40 kt
  • C
    280°/50 kt
  • D
    275°/40 kt

The average TAS during a descent is obtain from the CAS at the altitude that corresponds to 1/2 of the altitude difference.

The average TAS during a climb is obtain from the CAS at the altitude that corresponds to 2/3 of the altitude difference.

1/2 x 18 000 = 9 000 ft, Wind = 270º/40 kt

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