originally posted by mm43..
as the a/c would appear from analysis of the ACARS messages to have been in a deep stall for over 1min prior to impact.
HN39;
You are right, I was a little "loose" with my wording.
What I should have said was that the a/c on completing the left bank made 40NM in less than 4 min, yet impacted with a high vertical and low horizontal speed. The assumption is that the relationship between the vertical and horizontal speeds was as a result of a deep stall, where the loss of lift vortex created the wings level and small positive pitch on impact. To achieve both these conditions, i.e. covering the distance, yet impacting in the condition described, possibly resulted from an initial overspeed followed by a stall.
Not particularly wanting to revisit the "done to the death" ACARS messages -
FLAG ON CAPT PFD FPV and FLAG ON F/O PFD FPV (2 h 11)
This message indicates that the flight path vector (FPV) function is selected but
unavailable. In order to lose completely this function, which is elaborated by
the three IRs, in a way that is compatible with the CFR, one of the following
three conditions must be met for each ADR:
* barometric vertical speed higher, as an absolute value, than 20,000 ft/min,
* true air speed higher than 599 kt,
* measured calibrated airspeed lower than 60 kt.
- the second condition is possibly the trigger in this case.
mm43