Everybody is talking about the faulty radio altimeter as it is the main reason for the crash.
The main reason are the 3 pilots in the cockpit. They didn't check their basic flying instruments and didn't fly the aircraft. How is it possible that a "well" trained capt and 2 FO's didn't see that that the thrustlevers were at iddle for more than 100sec
and that the speed was dropped to 40 kts below it's target ???? During the approach, you are supposed to concentrate on the instruments and on flying the aircraft (even if it is doing an autoland)
The reason for me : very bad CRM and very poor flying qualities.
I did some flying in Turkey and I was not at all impressed by their qualities. Most pilots are ex-Military and they are still using their grades. This is Major X, this is Col Y. In the cockpit, most Captains think they are God and don't accept any input from the FO. A Captain was (without joking) calling a FO, the "Flap Operator". This is cultural and it's very difficult to change this.
The same happens at many other Middle-East companies. CRM, CRM, CRM !!!