Originally Posted by
cardiomd
Hmmm - again so if you are taking off on a LONGER runway, you have to re-run numbers again, to use possibly-more-detuned performance rather than just keeping specs you know will safely lift you off, or using full power knowing that you are "bounded" within safety?
Using data already computed for an intersection takeoff when you end up getting full length on the
same runway is okay.
If you have data for a 9k runway and end up on a totally different runway (even a parallel) that's longer, the original data is not valid. Each runway is computed based on its unique specifics (obstacles, slope, terrain, etc). Each set of data is specific to that takeoff.