BE58 FLT CREW HAS DOOR COME OPEN SEVERAL TIMES DURING FERRY FLIGHT; RESULTING IN REJECTED TKOF AND DIVERSIONS.

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THIS ACFT WAS FRESHLY PAINTED FROM THE PAINT SHOP AND I WAS RETURNING THE ACFT UNDER PART 91 RULES AND FILED AS PART 91. DURING THE TKOF ROLL; THE COCKPIT DOOR OPENED AND THE FO ABORTED THE TKOF. AFTER TAXIING BACK TO THE DEP RWY; WE SECURED THE DOOR AND ATTEMPTED ANOTHER TKOF. THE DOOR AGAIN OPENED ON THE TKOF ROLL; BUT DUE TO THE REMAINING RWY AND REQUIRED STOPPING DISTANCE; THE FO ELECTED NOT TO ABORT THE TKOF AND FLEW AROUND THE PATTERN AND LANDED. AFTER LNDG; WE INSPECTED THE DOOR AND BELIEVED THAT THE DOOR WAS NOT PROPERLY LATCHED. WE THEN DEPARTED WITHOUT INCIDENT. SHORTLY INTO CRUISE FLT; THE DOOR AGAIN OPENED AND WE CHOSE TO DIVERT AND LAND. THE FO THEN CONTACTED OUR OP DIVISION AND FOLLOWED UP WITH COMPANY MAINT PERSONNEL. AFTER SEEKING ADVICE; A LCL MECH CAME TO THE ACFT AND INSPECTED THE DOOR ADJUSTING THE LATCH PIN. THE FO AGAIN FOLLOWED UP WITH COMPANY MAINT PERSONNEL WHICH ADVISED WE WOULD NOT NEED ANY PAPERWORK FOR THE FLT HOME. BEING AS THIS WAS A PART 91 OP; WE DID NOT COMPLETE ANY DOCUMENTATION OF THE POSSIBLE DISCREPANCY WITH THE DOOR. THE FO AND I PROCEEDED TO DEPART AND ON THE TKOF ROLL THE DOOR OPENED. AFTER ANOTHER ATTEMPT; I DISCOVERED THAT THE DOOR WAS APPEARING TO OPEN SLOWLY AND DEDUCED THIS WAS FROM WIND RESISTANCE TO THE LATCH. A PIECE OF TAPE WAS PLACED OVER THE LATCH TO PREVENT WIND RESISTANCE FROM OPENING THE DOOR AND WE WERE ABLE TO SAFELY RETURN TO OUR ORIGINAL DEST. UPON ARR; MAINT PERSONNEL; DOCUMENTED AS A DISCREPANCY IN THE ACFT LOGS; AND ADDRESSED IMMEDIATELY BY COMPANY MAINT PERSONNEL. WE RPTED THE INCIDENT TO THE CHIEF PLT'S OFFICE OF OUR OP. I BELIEVE THIS WAS A WORN LATCH THAT NEEDED MAINT. BOTH PLTS ABOARD THE ACFT AND ALL COMPANY PERSONNEL INVOLVED BELIEVED THIS FLT TO BE OPERATING UNDER PART 91 RULES AND NOT REGULATED BY PART 135 MAINT LOGGING REQUIREMENTS. THE DOOR WAS DISCOVERED TO BE PROBLEMATIC AFTER RECENT MAINT WAS PERFORMED. THE PROB WAS BELIEVED TO HAVE BEEN PROPERLY CORRECTED AND FLT WAS CONTINUED UNDER PART 91 RULES. CLARIFICATION OF THE RULES APPLICABLE TO FLT WITH AN ACFT LISTED ON A PART 135 CERTIFICATE AND OPERATED UNDER PART 91 RULES. FAA AND COMPANY POLICY SHOULD BE REVIEWED AND CLEARLY ADDRESS THIS CONFLICT. BOTH PLTS INVOLVED HAVE ATTENDED REMEDIAL TRAINING AND FURTHER INVESTIGATE REGULATORY REQUIREMENTS ON MAINT RECORDS AND APPLICABLE REGS REGARDING FLT UNDER PART 91 AND PART 135 OPERATING RULES. ALL COMPANY PERSONNEL INVOLVED IN THE INCIDENT BELIEVED THIS FLT TO BE CONDUCTED UNDER PART 91 RULES AND NOT REQUIRED TO COMPLY WITH THE FAR PART 135.65 RPTING MECHANICAL IRREGULARITIES REG. PERSONNEL INVOLVED WANTED TO COMPLETE THE REPOSITIONING MISSION AND RETURN THE ACFT SAFELY WITHIN REGULATORY COMPLIANCE TO THE MAINT FACILITY.