Thanks mm43,
So the sharp turn at 2:10:34 or so did NOT cause a communications blackout. That came later. Communications should have blocked out during the postulated 50 degree bank for the 135 degree turn. Apparently it didn't, which is strange. And then it did blank out when the plan was apparently straight and level.
This gets more puzzling each time we get a little more data.
{^_^}