I have flown in Turkey and to be honest I have seen a lot of craps, when I say a lot it's a lot, which for sure could have end up in a field before the runway. So my bet is that the A/C has no technical deffects at all. I would be tempted to say that they lost control when they disconected the A/P. Knowing that they where three in the cockpit, I would say first flight as PF for the F/O after the type rating and no proper or too late correction of the captain. For sure it's just supposition...