A C210 INTENTIONALLY MADE A GEAR UP LNDG DUE TO R MAIN LNDG GEAR WOULD NOT LOCK DOWN MANUALLY OR PWRED. ACFT INCURRED MINOR DAMAGE.

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AT SPECIFIED TIME/DATE; I EXECUTED AN INTENTIONAL GEAR-UP LNDG. I DID THIS BECAUSE I WAS UNABLE TO GET A 'DOWN AND LOCKED' INDICATION FOR THE GEAR AND BECAUSE OBSERVATION OF THE R MAIN GEAR INDICATED THAT IT WAS NOT LOCKED. UPON SELECTING 'GEAR DOWN' ON PATTERN ENTRY; THE ELECTRIC PUMP CONTINUED TO RUN (IT NORMALLY SHUTS OFF AFTER COMPLETING THE EXTENSION CYCLE) AND THE 'GEAR SAFE' LIGHT FAILED TO ILLUMINATE. WE DEPARTED THE PATTERN AND; OVER THE NEXT HR; EXECUTED THE PUBLISHED 'EMER GEAR EXTENSION' CHKLIST NUMEROUS TIMES. WE DID THE CHKLIST AT VARYING SPDS AND 'G' LOADINGS. ACTIVATION OF THE HYD PUMP (WHETHER BY THE ONBOARD ELECTRIC MOTOR OR THE EMER HAND PUMP) WOULD POS THE GEAR INTO AN APPARENTLY DOWN POS. AS SOON AS THE PUMP STOPPED (BY PULLING THE CIRCUIT BREAKER ON THE ELECTRIC PUMP OR BY CEASING TO PUMP THE MANUAL HANDLE); THE R MAIN GEAR WOULD TRAIL REARWARD IN THE SLIPSTREAM. AFTER 1 HR OF TRYING; I BECAME AWARE THAT THE DOWN-LOCK MECHANISM WAS NOT FUNCTIONAL. I ELECTED TO LAND GEAR-UP RATHER THAN RISK LOSING CTL OF THE ACFT IF THE R MAIN COLLAPSED AFTER LNDG WITH AN UNSAFE INDICATION. THE GEAR-UP LNDG WAS UNEVENTFUL IN THAT THERE WERE NO INJURIES TO THE OCCUPANTS AND THAT THE DAMAGE TO THE ACFT WAS NOT SUBSTANTIAL. THERE WAS NO FIRE; THE ACFT DID NOT TIP OVER ON LNDG. THE INCIDENT FLT WAS THE ACFT'S SECOND FLT AFTER ITS ANNUAL INSPECTION. THE FACILITY THAT SIGNED OFF THE ANNUAL PERFORMED MAINT ON THE R MAIN GEAR DOWN-LOCK ACTUATOR. THEY PERFORMED BOTH NORMAL AND EMER EXTENSIONS AFTER THE WORK AND CLRED THE ACFT FOR RETURN TO SVC. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AIRPLANE SUSTAINED DAMAGE TO THE ENG; PROP AND LOWER FUSELAGE SHEET METAL. THE PROB WITH THE R MAIN LNDG GEAR DOWN-LOCK HAS NOT BEEN STARTED OR INVESTIGATED. THE AIRPLANE LOWER FUSELAGE SHEET METAL IS NOW BEING WORKED. THE RPTR STATED HAVING TAKEN SIMULATOR TRAINING ON GEAR-UP LNDG PROCS WAS A REAL HELP AND IN THE ACTUAL EVENT THERE WERE NO SURPRISES.