Using Mental Dead Reckoning (MDR) and the clock code technique, what is the crosswind component (to the nearest whole knot)? Given:
Runway: 32
Surface wind (from the tower): 005°/20 kt (wind from the tower is magnetic)
Variation: 15° E
Mental Dead Reckoning (MDR) crosswind component:
The XWC can be calculated using a “clock code rule”, where each 15º of wind angle is represented by ¼ of an hour – meaning ¼ the wind strength
Wind angle |
15º |
30º |
45º |
60º |
% of wind speed |
25 |
50 |
75 |
100 |
(wind angle is the angle between the wind vector and the track/runway direction to the nearest 10º)
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Runway 32 (320ºM) and wind 005ºM/20 kt => angle equals 45º
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Referring to the table above, we can immediately conclude that the crosswind component equals: 75% of 20 kt = 15 kt
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