Who said that FAR 25 define what a hard/heavy landing is? I wrote about landing gear DESIGN, and in any case what I wrote is exactly copied from a Boeing publication on overweight landings.
Fullblast, your answer to the question sounded to me like you were implying that FAR 25 provided a definition of hard/heavy landing, thus my response. Sorry if you took offense.
Definitely is, the difference is just 30 feet, 5%...enough to justify the words "pretty much", otherwise would have said only "correct". The original question was just that...the limit of heavy landing, and 630'/min is badly close to that limit (if it is a limit).
No, definitely wrong. The difference between 10 fps and 10.5 fps to an aircraft is more than you seem to think. It is not just a question of 5%. The words "pretty much" make it sound like it is okay, which it may well not be. To lead somebody to think otherwise, especially on this forum, could be dangerous. You need to be careful about making statements like this.