It was a silly mistake but crew dont get to drive heavy metal like that without lots of experience
Oh I don't know about that. There are many airlines using F/O's with less than 1000 hours total time and there is no way you can call those pilots "experienced" - unless you compare them with the new breed being currently trained to fly "heavy metal" with 40 hours (?) total aeroplane time and a couple of hundred in a simulator.