AN MX-7-180 ON LNDG ROLLOUT HAD THE L LNDG GEAR COLLAPSE INCURRING PROPELLER DAMAGE AND POSSIBLE ENG TEARDOWN.

Narrative

A NORMAL APCH WAS ESTABLISHED AND MAINTAINED TO THE CTRLINE OF RWY 30 (WESTERLY DIRECTION); AWOS WAS MONITORED BEFORE AND THROUGHOUT THE FLT AND NO DISCERNABLE XWIND WAS NOTED. THUS; I LANDED IN A FULL STALL; THREE POINT ATTITUDE ON CTRLINE OF RWY 30. DURING ROLLOUT; THE AIRPLANE SUDDENLY SHIFTED ON THE LNDG GEAR AND STARTED TO PULL HARD TO THE R. THE SENSATION WAS LIKE THAT OF A R SIDE FLAT TIRE. I IMMEDIATELY APPLIED L RUDDER (TO FULL STOP DEFLECTION); BUT THIS HAD NO CORRECTIVE EFFECT. THE AIRPLANE CONTINUED TO SWERVE HARD TO THE R SIDE OF THE RWY AT AN ESTIMATED SPEED OF APPROX 20-25 MPH. THE PLANE FELT AS IF IT HAD SHIFTED TOWARD THE L GEAR AND SIMULTANEOUSLY THE TAIL BROKE LOOSE AND THE L GEAR COLLAPSED INWARD. THE AIRPLANE IMMEDIATELY CAME TO REST FACING IN AN EASTERLY DIRECTION AND APPROX PARALLEL TO THE LNDG RWY 30. IT APPEARS THAT FAILURE OF THE L MAIN GEAR STRUT CAUSED THIS INCIDENT. A LOCAL A&P WAS ON SITE AND INSPECTED THE PART; NOTING A PRE-EXISTING CRACK IN THE STRUT. IN HIS OPINION; THE STRUT FAILED ON LNDG AND CAUSED THE INCIDENT. ACCORDINGLY; AT THIS TIME; I HAVE REACHED NO CONCLUSION AS TO ANY ACTION/REACTION WHICH I MIGHT HAVE TAKEN TO PREVENT OR MITIGATE THIS INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE LNDG WAS NORMAL AND ON ROLLOUT THE AIRPLANE PULLED HARD TO THE R. THE L MAIN GEAR FINALLY COLLAPSED BENDING INWARD AND DETACHING ITSELF FROM THE FUSELAGE MOUNTING. THE LNDG GEAR WAS INSPECTED AND A CRACK WAS DISCOVERED WHERE THE STRUT FAILED JUST BELOW THE AXLE BOLT. THE AIRPLANE INCURRED DAMAGE TO THE PROPELLER AND THE ENG MAY HAVE TO BE TORN DOWN FOR INSPECTION.