Figure 4.6-4 In-Flight Wind Estimation

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CALCULATING IN-FLIGHT WINDS
To calculate in-flight winds, analyze the affect that the winds have already had and
determine the direction of the wind from that analysis. As in chapter 5 preflight wind
problems, remember to erase the wheel before starting each new problem.
SITUATION: The TH of your EA-6B War-Prowler is 350° with a TAS of 150 kts. GS has
been determined to be 160 kts, and the Track is 355°. What is the wind?
ESTIMATE! First compare TAS to GS to determine HW/TW component: GS<TAS =HW.
Now, compare TH to TK: TH<TK means a Right Drift which is caused by a Left Crosswind.
We know that we are experiencing a Left Tailwind. The 10% Rule states that at a TAS of
150 kts, 15 kts of crosswind will give us about 6º of drift. A drift angle of 5º would only
require about 13 knots of crosswind. The inflight wind would be closer to the wing line at