conjecture
With Avionics Smoke, Lavatory smoke, and SEC 3.
The relation of unrelated ( or related ) failures avionics smoke, lavatory smoke and a SEC 3 fault is disturbing and perturbing.
What if the cockpit filled up with smoke ?
The avionics smoke checklist is not easy, and in my opinion should be trained more often, it the real world it does not happen as in the simulator.
I could understand the crew being too busy ( aviating ) to make a radio call.
The possibility of a Electrical fire comes to mind?
Then how does this lead to the appearance that they lost control of the airplane ?
The investigators have their work cut out for them, and the results will take a while to come out.
As we see how conclusions were jumped too immediately. Once again, the experts who know the most at this point will say the least, until the facts come out.