Hi HN39,
That graph is going to be a very useful tool, but I'm wondering if your time base might be one second adrift at the moment? I agree that the defined moment of "impact" is 12:45:39, but I'm still trying to find your quoted reference that Alpha Prot started at 12:45:34 (i.e., t -5), at an AoA of only +13.
Quote from the BEA (please excuse lack of accents):
"A t - 4 s, commutation sur la loi de pilotage en incidence, la valeur de 14.5 deg ayant ete atteinte, cette loi etant ensuite conservee."
Also, the DFDR print-out shows a corrupted reading ("D39"?) of longitudinal stick position ("commande profonde" or, in this case, alpha-cmd) at what I interpret as time 12:45;39. The two preceding values are U17 [sic] at 12:45:38 (t - 1) and U16 at 12:45:37 (t - 2)
Does the above make sense?
PS
Just noted your PS. I'm not sure, but I've been working on the assumption that the first value in a time frame is the exact second. So if there are 4 values in one second of a time frame, say 316.0 (s), the first would be at 316.0, the second at 316.25, the third at 316.5, and the fourth at 316.75. So, as you say, the values are sequential.
Likewise, with the hours and minutes, I've been assuming that the first line of "1245" refers to a time of 12:45:00. What I don't yet understand is why the associated value (column 2 on the same line) reads "296.0 (s)", but am hoping it doesn't matter!
Last edited by Jetdriver; 18th Dec 2013 at 08:05.