ACR MLG WITH TAIL CONE OF CANOE FAIRING ON FLAP TRACK REMOVED PER MINIMUM EQUIPMENT LIST REQUIREMENT HAD INTERFERENCE WITH FLAP ROLLER STRIKING FAIRING WHEN FLAPS RETRACTED FROM FULLY EXTENDED POSITION.

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THE LEFT INBOARD FLAP TRACK FAIRING CONE HAD BEEN DAMAGED BY A GND VEH. MAINT REMOVED CONE; INSPECTED FLAP TRACK; FOUND NO INTERIOR DAMAGE. WE WERE TOLD THAT MEL ALLOWED US TO GO. AFTER TALKING WITH COMPANY LINE MAINT AND DISPATCH WE AGREED TO ACCEPT ACFT AND DEPART. PRIOR TO PUSHBACK I REQUESTED MECH OBSERVE FLAP OP FROM UP TO FULL FLAP AND BACK UP; JUST TO BE SURE. DURING EXTENSION; NOTHING UNUSUAL OBSERVED. ON RETRACTION WE FELT A PRONOUNCED BUMP ON THE AIRFRAME. MECHANIC ADVISED A ROLLER WAS CATCHING ON THE AFT LIP OF THE FLAP TRACK FAIRING REMAINING AFTER THE TAIL CONE WAS REMOVED. THE AIRPLANE WAS TAKEN OTS. DURING A FLAP 40 APCH AND GO AROUND THE LEFT TRAILING EDGE FLAP COULD HAVE HUNG UP AS FLAPS WERE RETRACTED TO 15. THIS COULD HAVE RESULTED IN A SPLIT FLAP CONDITION; DURING A HIGH DRAG GO AROUND. DUE TO THE WEAR MARKS ON THE SIDE PLATE; WHICH IS A PART OF THE TAIL CONE; WE BELIEVE THE TAIL CONE SHOULD NOT BE REMOVED AND DISPATCHED AS WAS INTENDED DURING THIS INCIDENT. WE RECOMMEND DISSEMINATION OF THIS INCIDENT TO ALL FLT CREWS TO BE ALERT NOT TO ACCEPT DEFERRALS BUT TO CHK OUT ALL SYSTEMS AFFECTED PRIOR TO DEP. WE WERE LEGALLY RELEASED TO OPERATE THE FLT ONLY TO FIND A POTENTIALLY SERIOUS FLT CTL PROB AFTER REQUESTING AN EXTRA COMPLETE FLAP OP AT OUR INSISTENCE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR STATED HE HAS FOLLOWED AND FOUND THE DESIGN IS JUST ON THE LATE MODEL OF THIS MLG. THE ROLLER REFERRED TO IS A SIDE MOTION ROLLER DESIGNED TO TAKE CARE OF ANY SIDE MOTION OF THE FLAPS. THE SIDE PLATE ATTACHED TO THE TAIL CONE IS FOR A GUIDE OF THIS ROLLER TO PREVENT JUST WHAT HAPPENED. THE RPTR'S COMPANY HAS FIXED THE PROB BY ATTACHING A SIDE PLATE TO THE FORWARD PORTION OF THE FAIRING WHEN THE TAIL CONE AND NORMAL SIDE PLATE ARE REMOVED. THE PLTS UNION HAS BEEN GIVEN THE INFO; BUT HE DID NOT KNOW IF IT HAS BEEN COMMUNICATED TO THE FAA OR THE MFR. AS A SIDE ITEM; HE RPTED THAT HIS COMPANY HAS JUST MADE A POLICY DECISION NOT TO HAVE CROSS FLYING BTWN THE EARLY MLG AND THE ADVANCED TECHNOLOGY MLG.