AN MD11 AT ROTATION TO 500 FT DECLARED AN EMER AND DIVERTED DUE TO #1 ENG CONTAINED FAILURE OF THE TURBINE ASSEMBLY.

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BTWN ROTATION (136 KTS) AND 500 FT; EXPERIENCED SEVERE VIBRATION ON #1 ENG. REDUCED PWR TO NO AVAIL. PERFORMED ENG OUT DEP; SECURED #1 ENG; AND RETURNED TO BEIJING; CHINA RWY 36R ILS. ENG #1 TURBINE SECTION HAD SEVERE DAMAGE WITH SIGNIFICANT METAL PIECES IN EXHAUST. NO VISIBLE DAMAGE TO INTAKE AREA. NOTE: TO CUT THROUGH THE COMS BARRIER IN THIS PART OF THE WORLD; I CONSIDER IT MANDATORY TO 'DECLARE AN EMER.' THE CTLR UNDERSTANDS THIS AND PROPER SVC IS QUICKLY PROVIDED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED ON ROTATION THE VIBRATION FROM #1 ENG WAS SEVERE AND REMAINED SO EVEN WITH THE THROTTLE AT IDLE SO THE ENG WAS SHUT DOWN. THE RPTR AID THE AIRPLANE FLEW AND HANDLED GREAT AND THE RETURN WAS ROUTINE. THE RPTR SAID A PRELIMINARY CHK BY LCL MAINT BELIEVES THE TURBINE ASSEMBLY REAR BEARING FAILED. THE RPTR STATED THE TURBINE BLADES WERE EXTENSIVELY DAMAGED. CALLBACK CONVERSATION WITH RPTR ACN 498993 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE VIBRATION AFTER ROTATION TO 500 FT WAS SEVERE WITH THROTTLE SETTING HAVING NO EFFECT. THE RPTR SAID THE ENG OUT ON TKOF PROC WAS PERFORMED AND ENG SHUT DOWN. THE RPTR STATED ON A VISUAL CHK OF THE ENG THE TURBINE BLADES WERE ALL FRAYED.