ACR MDT SUFFERS PARTIAL COLLAPSE OF L GEAR ON LNDG PROC ROLLOUT.

Narrative

DURING FINAL APCH TO LNDG THE BEFORE LNDG CHKLIST HAD BEEN COMPLETED. THE ACFT TOUCHED DOWN NORMALLY THEN; DUE TO A GUST; IT BALLOONED INTO THE AIR JUST SLIGHTLY; NOT COMING OFF THE GND. DUE TO A L XWIND; THE L GEAR WAS THE FIRST TO TOUCH DOWN. AS IT SETTLED BACK ON ITS L SIDE; IT FELT AS THOUGH THE PLANE WAS TIPPING OVER ONTO ITS L SIDE; SO I TURNED THE YOKE TO THE R TO BRING THE R SIDE DOWN. THE L SIDE JUST KEPT ON DSNDING LOWER AND LOWER. I FINALLY RAN OUT OF ANY MORE R AILERON/SPOILER CORRECTION AND THE L SIDE SMOOTHLY GOT LOWER AND LOWER TO THE GND. AS WE WERE JUST ABOUT TO CALL THE TWR TO SEND OUT THE EQUIP; THE TWR NOTIFIED US THAT THE EQUIP WAS ON ITS WAY. WE CONTINUED ROLLING AND THE L SIDE STOPPED DSNDING BEFORE ANYTHING TOUCHED THE GND. THE NOSE STAYED UP IN THE AIR; BUT I WAS ABLE TO STEER THE ACFT OFF ONTO A TXWY USING THE BRAKES FOR STEERING. WE DIDN'T ORDER AN EVAC BECAUSE WE KNEW THERE WAS NO FIRE AND NO SCRAPING OF ANYTHING TO INDICATE ANY POTENTIAL DANGER TO US IN THE ACFT. WE DIDN'T KNOW ABOUT THE STABILITY OF THE ACFT DUE TO THE COLLAPSED LNDG GEAR. WE WANTED TO GET THE THUMBS- UP FROM THE FIRE/RESCUE CREW AND THEN DEPLANED EVERYONE OUT THE R REAR EMER EXIT DOOR. THE TAIL WAS ON THE GND BY NOW AND THE AIRSTAIR DOOR WOULDN'T OPEN MORE THAN 1/4 WAY. EVEN AFTER WE STOPPED; WE STILL HAD 3-GREEN LNDG GEAR LIGHTS.