Originally Posted by PJ2
If the thrust levers were left in the CLB [Climb] detent with loss of the autothrust system, the aircraft would slowly, (very slowly) accelerate towards VMO
That is correct but only if you consider that prior to the THRUST LOCK function activation, the thrust was at climb thrust, which is not necessarily the case. The thrust is locked at its level prior to disconnection, which could have been anywhere between idle and climb.
A 180deg turn, discussed last August on the second original thread now in Tech Log, would take just under seven minutes and cover a diameter of just under 14nm, (463kts TAS, 25deg bank, still air).
I agree on the diameter, but I would cut the time by half. The rate of turn would be close to one degree per second.