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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

  • A
    5 kt
  • B
    10 kt
  • C
    15 kt
  • D
    20 kt

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)

  • Runway 32 (320ºM) and wind 005ºM/20 kt => angle equals 45º

  • Referring to the table above, we can immediately conclude that the crosswind component equals: 75% of 20 kt = 15 kt

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