Originally Posted by
Tu.114
A sloping runway, be it up or down, will influence that sink rate. An upsloping runway will come up to meet You, a downsloping one will shy away from You. In the first case, Your effective sink rate is higher, in the second case, lower. So with an upsloping runway, flare a tad earlier and more; with a downsloping one, later and a little less. If done right, You will achieve roughly the same body angle on touchdown relative to the runway, whatever the slope may be.
To be honest, I do not advocate this technique in training. If you misjudge the higher flare only slightly it's an invitation for hard landings. On an upslope runway, you are tempted to pitch up even more which is very risky when you reduced thrust too soon as well.
It is much more important to focus on thrust control. Max 20ft above your normal flare moment, add a touch of thrust. Just push them 1-2cm forward to create the thrust required on a 2-2,5° slope glide and support the nose enough to allow the added thrust break the rate of descend every slightly. But don't let the nose "pitch up" too hard to avoid long landings. Then do a normal flare with normal thrust reduction. If the landing is slightly more positive, that is ok, it beats flying over the top of the uphill :-).
Just remember: we don't stall to land like Cessna's, we fly it on the runway to be able the land in full control.
Ps: B737 (added later on as I didn’t realise this was Airbus related).