MOONEY 201 M20J PLT HAS R MAIN GEAR COLLAPSE ON LNDG. CIRCUIT BREAKER POPPED BUT GEAR SWITCH WAS IN DOWN POS.

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ON APCH TO 3BS RWY 24; I PLACED THE GEAR SWITCH IN THE DOWN POS PER THE PRELNDG CHKLIST. THE INDICATORS SHOWED DOWN AND LOCKED. THE APCH WAS STABILIZED AND THE WINDS WERE 220 DEGS 10 KTS. A SLIGHT CRAB TO THE L WAS NECESSARY TO HOLD THE CTRLINE. HOWEVER; THE WINDS SUBSIDED FOR A MOMENT REQUIRING A CORRECTION TO THE R. UPON LNDG; THERE WAS A SENSATION OF THE R GEAR COLLAPSING; AND THE ACFT SLID DOWN THE CTRLINE; THEN GRADUALLY TO THE R. THE ASSISTING FBO OBSERVED THE GEAR SWITCH IN THE DOWN POS; HOWEVER; THE CIRCUIT BREAKER HAD POPPED. PERHAPS THE GEAR WAS NOT ENTIRELY DOWN AND LOCKED WHEN THE CIRCUIT BREAKER POPPED; AND THE CORRECTION TO THE R PUT A SIDE LOAD COLLAPSING THE GEAR. THE R MAIN GEAR ROD HAD BENT AND THE MAIN GEAR INNER DOORS WERE SCRATCHED; SO THEY HAD TO BE DOWN TO BE DAMAGED. NO INJURIES. MINOR DAMAGE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES HIS ACFT WAS MOONEY 201 M20J. THE FAA HAS INVESTIGATED AND RPTR WILL NEED TO TAKE A RIDE WITH AN INSPECTOR FOR SOME TKOFS AND LNDGS. RPTR HAS READ IN THE MOONEY MAGAZINE THAT THERE HAVE BEEN 6 OTHER INCIDENTS WITH GEAR PROBS AND 4 WHERE THE GEAR ACTUALLY COLLAPSED. THE PROB SEEMS TO BE IN THE GEAR XMISSION AND WHEN IT FAILS THE GEAR WILL NOT COME DOWN EITHER ELECTRICALLY OR MECHANICALLY. THE MECH WITH WHOM RPTR SPOKE INDICATES THAT THERE IS AN ELONGATED SCREW IN THE SYS AND IT WEARS AND BECOMES ROUNDED SO IT WILL NOT FUNCTION IN THE GEAR SYS. SINCE THE FBO OPERATOR CHKED FOR HIM THAT THE GEAR SWITCH WAS DOWN; HE BELIEVES IT WAS THE SYS AND NOT HIS FLYING THAT CAUSED THE PROB.