Originally Posted by gengis
For this discussion, let us define a hard landing as one in the region of 1.5g.
This may be VERY low. You may want to think about instantanoeus accelerations closer to 2.5'g' than 1.5'g' - which drastically changes much of the argument relating hard landing loading cases and in-flight 'g' envelopes....
Bear in mind also that QAR/FDR data is usually sampled at quite low rates, so it's very easy to miss the true peak decelleration actually experienced by the aircraft.