INSTRUCTOR WITH SPI ON LNDG ROLL HAS WHEEL COLLAPSE. MAINTAINS FAIRLY GOOD CTL TO KEEP ACFT ON RWY UNTIL IT STOPS.

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STUDENT PLT WAS PLTING THE ACFT ON APCH. WITH A FINAL APCH SPD OF 65 KTS; A SMOOTH LNDG WAS MADE PRIOR TO THE FIXED DISTANCE MARKERS. ON TOUCHDOWN; I HEARD A 'PING;' AND THE ACFT ROLLED ON BOTH MAIN WHEELS AND THEN THE NOSE WHEEL TO THE RWY INTXNS (23/5 AND 15/33). WE ROLLED THROUGH THE RWY INTXNS WHEN WE FELT THE L WING LOWER. THE WING LOWERED AS IF THE STRUT HAD COLLAPSED. I TOOK CTL OF THE ACFT AND TRIED TO HOLD THE WT OFF THE L SIDE BY USING THE AILERON. MY STUDENT ASKED ME IF I THOUGHT WE HAD A FLAT TIRE. AT THAT MOMENT A RUBBING NOISE STARTED AND I MAINTAINED DIRECTIONAL CTL OF THE ACFT BY USING R RUDDER AND DIFFERENTIAL BRAKING. AS THE PLANE SLOWED; I RETRACTED THE FLAPS; THINKING THAT THIS WAS THE SOURCE OF THE NOISE; BUT IT CONTINUED. I THEN POSITIONED THE AILERONS TO NEUTRAL; ALSO WONDERING IF THIS WAS WHAT WAS CAUSING THE RUBBING NOISE; BUT IT CONTINUED UNTIL THE ACFT CAME TO A STOP. THE ACFT CAME TO REST 20-25 FT PRIOR TO INTXN D; ON RWY 5; AND 10-15 FT TO THE L OF THE RWY CTRLINE. AFTER THE ACFT STOPPED; I SHUT DOWN THE ENG AND TURNED THE MASTER SWITCH TO THE 'OFF' POS. I THEN INSTRUCTED THE STUDENT TO TURN THE FUEL SELECTOR TO THE 'OFF' POS AS WELL. WE EXITED THE ACFT AND BY THE TIME WE WERE OFF THE WING; THE FIRE/RESCUE TRUCK WAS THERE IN FRONT OF US AND THE DRIVER INFORMED US THAT HE SAW NO FUEL LEAKING. WE WALKED AROUND THE FRONT OF THE PLANE AND SAW THAT THE L WING WAS RESTING ON THE L WHEEL AND FAIRING. THE FAIRING AND PART OF THE STRUT ASSEMBLY WERE POSITIONED WITH THE INSIDE OF THE FAIRING DOWN AND THE L WING WAS RESTING ON THE TOP OF THE OUTER PORTION OF THE WHEEL FAIRING. THE REMAINING PORTION OF THE STRUT WAS POSITIONED SO IT WAS STRAIGHT AHEAD (IN LINE WITH THE NOSE) UNDER THE WING AND STILL ATTACHED TO THE WHEEL ASSEMBLY; WHICH WAS HELD UNDER THE ACFT WING BY THE BREAK LINE. INSPECTING THE WING; I SAW THAT NO PORTION OF THE WING HAD TOUCHED THE GND. I FEEL THERE SHOULD BE A WAY TO INSPECT THE STRUT SCISSOR AND CASTING IN THE PREFLT IN ACFT WITH WHEEL FAIRINGS.