ACFT EQUIP PROB -- THE R MAIN GEAR STRUT FAILED ON LNDG ROLLOUT.

Narrative

ON A FLT FROM MSP-SDF; EVERYTHING WAS NORMAL UNTIL THE LNDG. WE WERE GIVEN RADAR VECTORS TO INTERCEPT THE LOC FOR RWY 19 AT SDF. ONCE CAPTURING TO LOC AND CALLING THE ARPT IN SIGHT. WE WERE CLRED FOR A VISUAL APCH TO THE SAME RWY. WE CONTACTED THE TWR AND WERE CLRED TO LAND. THE ENTIRE APCH WAS NORMAL. WE WERE ON THE LOC AND GS AND ON SPD; FULLY CONFIGURED WITH FLAPS AND GEAR; BY 1000 FT AGL DURING THE FLARE; THE ACFT FLOATED SLIGHTLY WHILE IN GND EFFECT; WE STILL TOUCHED DOWN WITHIN THE TOUCHDOWN ZONE OF THE RWY. THE LNDG WAS VERY SMOOTH (A ROLL-ON). AT REAR WHEEL SPIN-UP; THE GND SPOILERS WERE DEPLOYED. AT THIS POINT IN TIME; THE ACFT FELL ON THE R SIDE. THE #3 AND #4 ENGS MADE CONTACT WITH THE RWY AND RESULTED IN AN ENG FIRE INDICATION. THE ACFT WAS BROUGHT TO A STOP ON THE RWY WITH 3000 FT REMAINING. THE COCKPIT FILLED WITH SMOKE; WE PROCEEDED WITH THE EMER SHUTDOWN AND EVAC. WHEN THE FIRE SHUTOFF HANDLES WERE PULLED; THE FIRE INDICATIONS ON BOTH THE #3 AND #4 ENGS STOPPED. THE CREW EVACED THE ACFT VIA THE MAIN CABIN DOOR AND USING THE ESCAPE SLIDE. ONCE ON THE GND OUTSIDE THE ACFT; WE SAW WHY THE ACFT FELL ON THE R SIDE. THE R MAIN LNDG GEAR HAD COLLAPSED. THE ENTIRE GEAR ASSEMBLY HAD LODGED ITSELF BTWN THE FUSELAGE AND THE R INBOARD FLAP. THE GEAR ASSEMBLY HAD BROKEN COMPLETELY OFF THE STRUT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATES THAT THE FIRE INDICATIONS WERE DUE TO SPARKS AND DEBRIS AS THE ENGS SCRAPPED ALONG THE RWY. THE DC-8- 71 IS FLYING AGAIN. THE DAMAGE WAS CAUSED WHEN THE SUPPORT STRUT ITSELF CRACKED JUST ABOVE THE OLEO AND NOT THE BOLT FAILING. THE NTSB IS DOING AN ANALYSIS OF THIS FAILURE NOW.