Hi,
F-GZCP was operating with Pitot heating in which mode? Auto or manual mode?
This was mentioned in BEA reports on AF447 case?
FDR records enough data on this issue?
In other 32 UAS incidents Auto mode was selected, as recommended (default)?
Most crews use Auto or manual mode when closing in specific WX conditions?
The timing required for AP/ATHR quit is "compatible" with "heating time constant" of probes when encountering ice crystals when auto mode is selected?
PS
If the temperature BEFORE encountering ice crystal is higher (as in this case) WORSE.
The "required heat" will takes longer to set in the probes.
The recorded data show the opposite of a temperature drop. At 02:09:30 the temperature was ISA +10.6°C, trending downwards (Interim #3, p.48), and at 02:10:00 it was ISA +15.6°C (p.86).
Therefore a fact in that flight.