bubbers44 and
PJ2, re CAS / Mach with trapped total pressure.
I computed them with functions from an old (but long tested) homemade personal software (hey, I can do sfwr). It is not rocket science but I don't know how to post a picture of the formulas used and I fear it would not be clear enough if I tried to edit it here so I think it is better to look at the formulas for CAS (subsonic speeds) at
Calibrated airspeed - Wikipedia, the free encyclopedia and for Mach number at
Mach number - Wikipedia, the free encyclopedia
To use these formulas you need:
ps = static pressure, pt = total pressure, qc = pt -ps.
p0 = 1013.25 hPa
a0 = 661.479 kts
________FL350 __ FL375 __ FL380
ps (hPa) 238.42 __ 211.48 __206.46
If anyone wants to check this and find different results, please let me know.
I find the overspeed hypothesis not very convincing because it does not add up with TOGA thrust selection, don't explain the zoom climb and I believe it was not observed in previous incidents. However perhaps it should not be completely discarded.