Originally Posted by
BraceBrace
Flaps 30 doesn't float with the correct technique in crosswind landing. Trying to smooth out the landing does.
Flaps 40 only for steep approaches (or light ferry flights... maybe...)
Just had a quick check on our OPT before posting this. At the UK airfield I’m based at a fairly typical winter combination of low pressure and wet runways, given a ninety degree crosswind with a 15 knot gust factor (so as to need a speed increment of 15 knots), at max landing weight flap 30 exceeds the LDA even with max manual braking, whereas flap 40 can just be done, even a couple of tonnes below MLW it can be hard to get flap 30 figures to work in those conditions. That’s for an 800 without short field performance kit.
So whilst the comment about flap thirty quoted above is correct the comment about flap 40 isn’t entirely true. As a purely personal opinion I’d prefer flap 30 if it’s really gusty because of the greater margin between approach speed and flap limiting speed, but if you have to use flap 40 the technique is the same, land it firmly and don’t mess around floating down the runway with one wing down trying to make a smooth touchdown, it just increases the chance of striking the flap track fairing.
Thats just a personal opinion, by the way, and others may disagree.