Not all crosswind components are demonstrated, some can be derived mathematically, and not all crosswind values are limitations, some are advisory. (Hence the caveat in the 737 limitations)
Part 25.237 "For landplanes and amphibians, a 90-degree cross component of wind velocity, demonstrated to be safe for takeoff and landing, must be established for dry runways and must be at least 20 kts or .2Vso whichever is greater, except that it need not exceed 25 knots."
Last edited by '%MAC'; 21st Aug 2002 at 03:23.