CP, #1558
1. ‘They were in a CB’’. There is no evidence that the aircraft was in a CB; the crew had seen and planned / turned to deviate around weather.
2. ‘Air data ice protection on’. A feature of pitot blocking due to ice crystals is that there has to be a heated surface on which some crystals can accumulate / melt. The water becomes the glue for other crystals to build up on, or the water ice mix can stabilize around freezing and block the pipes / vents.
3. ‘Fly attitude / power’. This depends on what the crew see and understand about the situation, and then depending on complex circumstances the ability to fly accurately, all in a very sudden, surprising, and complex situation.