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An aircraft descends from flight level 180 to ground level with a constant TAS of 220 kt.The TT in descent is 080°. The W/V at various flight levels in the area are given below.

FL W/V
ground level 260°/25 kt
30 270°/30 kt
60 270°/35 kt
90 270°/40 kt
120 280°/50 kt
150 285°/55 kt
180 290°/55 kt

Calculate the average GS in descent.

  • A

    273 kt

  • B

    259 kt

  • C

    266 kt

  • D

    254 kt

Refer to figure.
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 FL 180 = FL 90

The wind to be considered for the performance calculations must be considered at FL90, 270º/40 kt.
Calculate the G/S with the flight computer as shown in the figure. The answer is 259 kt.

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