De voorlopige conclusies staan al online;
* no evidence of fuel shortage, birdstrike, icing, windshear, wake turbulence, or engine, system or control malfunction
* the first officer was initially flying the aircraft and was inexperienced in airline operations
* autopilot and autothrottle were in use
* the aircraft was initially high and fast on the approach and at about 2,000ft above ground the throttles were pulled to idle
* the authrottle went to "retard" mode and the throttles then stayed at idle for about 100 seconds during which time the speed fell to 40kt below reference speed
* the aircraft descended through the glideslope with the captain talking the first officer through the before landing checklist
* the stick shaker activated at about 400ft above ground and the first officer increased power
* the captain took control and as the first officer released the throttles they moved to idle due to being in "retard" mode
* after six seconds the throttles were advanced but as the engines responded the aircraft hit the ground in a slightly nose-high attitude
* throughout the episode the left-hand radio altimeter read negative seven feet altitude, but the right-hand radalt worked correctly
Boeing will warn crews about fundamentals like flying the aircraft, monitoring airspeed, monitoring altitude, and will give advice about radalt issues.
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http://www.flightglobal.com/blogs/unusual-attitude/2009/03/turkish-airlines-crash-evidenc.html