Blockage of TAT probes tend to occur suddenly, similar to pitots. In this case the TAT rose gradually between 2:09:52 and 2:10:04, while the airplane was entering a vertical gust that reached 22 kt at 2:10:03.5 - see figure 64 of the Final Report, the correct one, not the figure 64 erroneously included in the English version.
Fair enough. Thanks for clarifying. So then why did both pilots notice increased temp more than a minute before the TAT increased? If rising TAT led to increased cockpit temp, then the sensed TAT (measured externally) should rise before this warmer air led to increased cockpit temp.
"2 h 09 min 46. Background noise increases (typical noise of impact of ice crystals, identified by A330-340 pilots) "
Sure, the report explains this instance of
increased background noise as being due to ice crystals. It makes no interpretation of the two previous references to
change in background noise at 2.08.17 and again at 2.09.40. The CVR transcript merely states "change in background noise". These comments are earlier, on page 22.