Last weekend, I flew FR
and the landing, oh how shall I put it, was like a brick; it just came down hard ... no bounce, but very firm. It was a perfectly safe landing, probably a good landing technically, but not comfortable.
It got me to thinking, at what point (in terms of feet per second) does a landing start to cause damage. Clearly, a good landing would be 5-10' per second (presumably the oleos would be able to absorb that almost completely), but once you get to around 20-30' per second, you could be looking at fuselage fracturing, possibly the main gear (or nosegear) being pushed up into the landing gear bay?
Also, most airlines (as far as I'm aware) have reports that need to be completed if a hard landing is made. How is this triggered? Is there any report (for example, downloaded from the "Quick Access Recorder" which could tell the crews, "that's above the limit, we need to file a report" - or is it just a question of "that felt bloody rough"?