Cabin Vertical Speed : not that significant ?
Gentlemen,
may I suggest that many people here place way too much emphasis on that ACARS message regarding cabin vertical speed. What the BEA really says only really amounts to this :
a 150 ft measured change of cabin pressure in less than 5 seconds.
That change need not be real, only measured by the CPCs, the working details of which we have no notion.
That might very likely be only a glitch as pressure measurements go bonkers while CPCs try to cope and decide if they have to quit just now or later.
In essence, trying to derive aircraft altitude or vertical speed from this information alone goes against sound scientific reasoning. And that is what many do here. There is no proof that end of ACARS means end of flight. That cabin V/S message was likely acquired around 02:10, and could only be sent four minutes later.
Thoughts ?