Originally Posted by
agg_karan
I am also assuming it is the reason why there is a limitation/recommendation (in FCTM) of VREF + 20 knots max speed correction in normal circumstances for landing. Wish BOEING was more detailed on these subjects.
According to the patent....
"Like aft body contacts, nose gear first contacts can be avoided by adjusting a variety of flight parameters. Decreasing landing approach speeds, decreasing trailing edge flap deflections at the landing flap detents, and decreasing lateral control surface symmetric droop all increase the landing pitch attitude of an airplane. This increase improves nose gear contact margin. The drawback of these various approaches is that increasing pitch attitude attendantly reduces aft body contact margin. The resulting reduction in aft body contact margin consequently increases the probability of aft body contacts."
I suspect that the reason for a maximum of Vref+20 is for more than one reason which includes nosegear contact margin.