Capt Claret;
Although there are no regulatory requirments for QAR parameter definitions, the FOQA QAR is just fine for determining hard landings. In fact, often the QAR sample rates are higher than the DFDR for some parameters depending upon the DFDAU LFL, (logical frame layout, or data frame).
If the IVSI is recorded at a sufficently high rate, maintenance can and do determine the touchdown 'g' using the rate of descent for the purposes of assessing the requirement for a hard landing check. This would done on the B777 as the vertical accelerometer, which is located in the ADIRU bay near the cockpit and is not reliable. It can be spikey and can trigger false hard landing FOQA events.
[Load 15 info deleted - thanks]
PJ2
Last edited by PJ2; 13th October 2010 at 23:20.