I missed the earlier threads which discussed the weather radar. From the recent posts it appears that the installation on this aircraft required manual tilt setting. Some aircraft in our fleet have manual tilt setting and the normal setting is about 5 degrees up for takeoff reducing throughout the climb to a setting of 1-2 degrees down in the cruise. Unless a top of climb routine or scan is carefully done to include the radar tilt setting, it is all too easy to leave the tilt at the takeoff setting and see nothing but clear sky on the radar display. A CB penetration would therefore come as a complete surprise, with no pre preparation such as reducing to turbulence speed and ensuring everyone was seated and belted. Maybe a simple omission such as that could have been the trigger for the whole accident sequence. Only speculation, not accusation.