Originally Posted by jcjeant
In the timeline transcript the BEA write:
Between 2H10min07 and 2H10min18 the vertical speed increase to 5200 ft/min
That's indeed true .. and when you put it in correlation with the graphic you see immediately it's a vertical speed to down (loss of altitude)
Vertical speed used by BEA in transcript is misleading less the down qualification (as in the timeline the BEA don't give the difference of altitude during the time gap)
So I can at least understand a little more why the PF give a up command (stick back) as a vario of 5200 ft/min down is not a negligible vertical speed ...
No, no, no... V/S increased to +5,200 ft/min between 0210:07 and 0210:18 !!!
But sure, right before this point, two seconds before precisely, it decreased, say at -18,000 ft/min in one second... (or you can even make a 10 times much bigger number if you use 1/10th of second), because it was the false loss of about 300 ft due to UAS at 0210:05.
. ADR 1 (altitude, ft)
0210:00 -> 35,044
0210:05 -> 35,024 (UAS after this point, barely no mach correction of static pressure)
0210:09 -> 34,664 (ISIS: 34,900)
0210:11 -> 34,636 (lowest altitude recorded)
0210:17 -> 34,976
0210:25 -> 35,856
Explanations, BEA report #2 p.48: (they should have anticipated that far the cover up of those tracks "issues")
