INSTRUCTOR WITH STUDENT HAS GEAR COLLAPSE ON LNDG ROLL.

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I WAS FLYING WITH A STUDENT ON MAR/XX/94. IN THE MORNING; WE WERE IN THE PATTERN AT LYNCHBURG (LYH) IN A PA 28R- 201. WE WERE PERFORMING AN EMER LNDG SIMULATION. WE LOOKED SEVERAL TIMES STARTING WITH L BASE FOR GEAR DOWN 3 IN THE GREEN INDICATION. WE CHKED ON L BASE; FINAL; AND SHORT FINAL FOR THESE INDICATIONS. ALL INDICATIONS WERE THAT THE GEAR WAS DOWN AND LOCKED. WE PROCEEDED WITH A SMOOTH LNDG AND ROLLED ABOUT 300 FT WHEN THE R GEAR COLLAPSED. WE DID OUR BEST TO MAINTAIN DIRECTIONAL CTL AND CAME TO A STOP ON THE R SIDE OF THE RWY APPROX 10-15 FT FROM THE EDGE. WE SHUT THE ENG DOWN AND TURNED THE FUEL OFF. THERE WAS NO ENG DAMAGE. THERE WAS A SLIGHT FUEL LEAK FROM THE FUEL VENT WHICH WAS STOPPED WHEN THE ACFT WAS PUT ONTO ALL 3 GEAR AGAIN. THERE WAS LITTLE DAMAGE TO THE ACFT AND THERE WERE NO INJURIES. ARPT SAFETY OFFICIALS RESPONDED QUICKLY TO THE SCENE TO INSURE THAT THERE WERE NO INJURIES; OR NO FURTHER RISK OF DANGER. THE ACFT IS PRESENTLY BEING EVALUATED TO SEE WHAT THE PROB IS.