WP
It is all in the report.
The third sensor did not fail - It explains that the No3 Sensor was working. It gave the stall warning.
The report gives data abour two tests. One had high pressure water sprayed directly at the sensor - water was found inside the sensor. Another test had water sprayed in wash pattern - i.e. to and fro across the sensor. This sensor was found to have no water inside.
As far as anti-ice. The AoA blade is heated so that the sensor can resisit accumalted ice. The internal mechanisms are not heated. The tests also showed that once ice forms and then melts, this residual water still impeded the sensor functionality.
Of note is a series of pictures showing the PFD speed displays for the flight with and without the AoA frozen. The pics show a very large range between Vls & Alpa prot. It just looks so odd and you would have hoped that someone would have noticed. It they had calculated the speeds as per the test schedule then it would have been very obvious of the difference between FAC & FMGC calculated speeds.
Last edited by Thunderbug; 17th Sep 2010 at 08:10.