Speedbird48. .. .Not sure exactly what you mean about the FAA and Flight Manuals. .. .FAR Section 25.237: Wind velocities.. .(a) 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 knots or 0.2 VS0, whichever is greater, except that it need not exceed 25 knots. . .. .Normally, a datum 'established' under FAR 25 is recorded in the Flight Manual.. .. .Or do you mean 'they do not specify a limit'? In which case I agree...