Alex and John's memories regarding the 7 knot component are correct. This also had a significant effect on the performance schedules of the MD8X series of aircraft when certified by the CAA. Some of our senior readers may be able to remember if similar penalties were applied to the DC9 family prior to this.
The post above this clearly demonstrates the importance of a crosswind component while involuntarily exploring the concept of Vmcg. I will refrain from leaping onto my hobby horse of what is essential safety legislation and the role of commercial interests in its creation.
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Regards from the Towers
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