Cabin Vertical Speed Advisory
thinking to this last ACARS at 02:14Z, we can bear in mind that all the past Pitot freezing events duration was less than 4 mn (typically 3mn): even if the static ports were compromised during the cruise phase at high altitude at 02:10Z (during these past events, it induced a slight barometric altitude bias: a few 100ft), after more than 4 mn and probably, in the AF447 case, a large loss of altitude (external temp. increase), isn't it probable that the air data (ADR) had recovered/de-iced ? beside the BEA reports have raised the possibility that the PRIM were manually reset at 02:13Z (to explain ACARS that were not seen during the other past Pitot freezing events): if true, this could only have happened because the air data was back at 02:13, prompting the crew to try to regain the normal law, don't you think ?
Jeff