Originally Posted by
mm43
At
post #657 HN39 made the following "tongue in cheek" comment -I don't think that everyone picked up on what he said, but the discussion over KE principles has been interesting and informative.
henera;
I believe the forecast temperature was -46°C at FL350, and I wouldn't be surprised if it was even warmer where AF447 was, e.g. -42/-43°C.
Thanks mm43 !
That would give us a TAS of 489kts at M0,80 and 500kts at M,82.
Looking at the setting of the RTLU at the time of the beginning of UAS a Mach speed of roughly M0,80 seems likely. So we would be back somewhere around the 490kts and ~4000ft.