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Given the following information, calculate the True Heading (TH) and TAS:

True Track: 321°
GS: 123 kt
W/V: 213°(T) / 21 kt

  • A
    TH: 330°, TAS: 131 kt
  • B
    TH 311°, TAS: 118 kt
  • C
    TH: 326°, TAS: 127 kt
  • D
    TH: 316°, TAS: 120 kt

Refer to figure.

Using the Flight Computer:

(1) Set the centre dot over the arc marked 100;

(2) Set Wind Direction (213º) under True Index;

(3) Mark wind Velocity (21 kt) up from center point – over 121 kt;

(4) Set True Track (321º) under True Index;

(5) Move the slide until the centre dot is over the ground speed arc – 123 kt;

(6) You can read the True Airspeed where the end of the line falls – in this case, 118 kt;

(7) The wind correction angle (WCA) reads between center line and wind velocity mark – approximately 10ºL.

  • Wind correction angle = 10ºL (-)
  • True Heading = True Track - WCA = 321º - 10º = 311º

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