To be possible add a wind vector given in knots, first a conversion from a mach no. to TAS must be carried:
TAS = Mach No × 38.95 √ OAT (Kelvin)
TAS = 0.78 x 38.95 √ (273 - 35) = 469 kts
Determining Heading and G/S with the flight computer:
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Set Wind Direction under True Index.
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Mark wind Velocity up from center point (70 kts).
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Set True Course under True Index.
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Slide wind Velocity mark to True Air Speed.
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Ground Speed reads under center.
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WCA reads between center line and wind velocity mark.
Drift or drift angle, is the angular difference between the track of the aircraft across and it's heading.
Always remember that the drift angle is always measured with reference to the heading.
The heading is the direction in witch the the aircraft’s nose is pointing for.
Wind Correction Angle is the angular value opposite to the drift angle, and it refers to the heading angle correction in order to keep your aircraft in the desired track.
Read WCA 6º L on the flight computer, heading = 360º - 6º = 354º (T). G/S = 416 kts.
True heading (T) |
Variation (V) |
Magnetic heading (M) | Deviation (D) |
Compass heading (C) |
354º | 10ºE | 344º |
FT GH = 600 / 416 = 01º27’
ETA H = 12º10’ + 01º27’ = 13’37º
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