BEECH BONANZA SUFFERS NOSE GEAR COLLAPSE ON LNDG.

Narrative

I WAS ON A VISUAL APCH. AT 2000 FT MSL; I LOWERED THE LNDG GEAR AND VERIFIED 3 GREEN LIGHTS. ON DSCNT; I EXECUTED AN APCH CHKLIST AND RE-VERIFIED 3 GREEN. TOUCHDOWN WAS VERY SMOOTH AND R MAIN WHEEL FIRST FOLLOWED BY L MAIN AND NOSE GEAR. AS I WAS SLOWING DOWN; I ADDED THROTTLE TO BRING RPM'S UP TO 1000 RPM AND AT APPROX 35 KTS; THE NOSE GEAR COLLAPSED AND ACFT HAD A PROP STRIKE. THE ACFT CAME TO A REST ON THE BELLY WITH THE MAIN GEAR STILL DOWN. I PROMPTLY EXITED THE ACFT AND GND PERSONNEL WHO WITNESSED THE INCIDENT ARRIVED SHORTLY AFTERWARDS. CAUSE OF INCIDENT IS STILL BEING DETERMINED. I DID NOT RECALL TOUCHING GEAR LEVER OR FLAPS AND WAS TRAINED TO WAIT UNTIL OFF THE RWY TO 'CLEAN UP' THE ACFT. SUFFICIENT RWY WAS AVAILABLE (MORE THAN 3000 FT LEFT) AND MY HAND WAS ON THE THROTTLE AT THE TIME OF THE GEAR COLLAPSE. I WAS NOT DISTR AT THE TIME. MY BELIEF IS THAT THE GEAR EITHER HAD A MECHANICAL COLLAPSE OR THE GEAR LEVER WAS MALFUNCTIONING. I DO NOT BELIEVE THAT INADVERTENT GEAR RETRACTION WAS A CAUSE. POST INCIDENT INSPECTION BY ARPT EMPLOYEES VERIFIED GEAR SWITCH WAS IN THE DOWN POS AND THAT NOSE GEAR SWUNG FREELY UP AND DOWN BUT WAS NOT LOCKED. ACFT HAS SQUAT SWITCHES THAT PREVENT GEAR FROM RETRACTING ON GND. ACFT WAS IN ANNUAL AND MAINT WAS UP TO DATE. GND PERSONNEL MAY HAVE FURTHER DAMAGED ACFT AND LNDG GEAR WHEN MOVING THE ACFT OFF OF RWY.