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An aircraft descends from flight level 180 to ground level. In the table the W/V at various flight levels in the area are given.

Ground level: 260° / 25 kts
FL30 270° / 30 kts
FL60 270° / 35 kts
FL90 270° / 40 kts
FL120 280° / 50 kts

Which W/V should be used to solve descent problems e.g. the calculation of the GS from TAS and the Track in descent?

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

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