Was their weather avoidance equipment in good working order ?
This is the second CB related accident for this operator .The Pilots took a servicable aircraft into wx that was beyond the capability of the aircraft.
Maybe the Radar systems of these aircraft needs to be looked at as well as no sane pilot in a civilian aircraft would willingly and knowingly fly into a CB with tops of 0ver fifty thousand feet.
As the USAF training video used to say "There is no reason to take ANY aircraft into a CB"
There are many causes to most accidents,hopefully someone will be asking about this companies weather avoidance strategies.And whether their radar was working and if the pilots willingly and knowingly attempted to take an aircraft into an enviroment beyond the aircrafts abilities.