PIC OF A B747-200 ON A CRAF OP ADMITS TO LEAVING COCKPIT DOOR OPEN FOR PAX COCKPIT ACCESS DURING OPS THROUGH FOREIGN AIRSPACE NEAR EDFF ARTCC ZONES; FO.

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I WAS INVOLVED IN CRAF (CIVIL RESERVE AIR FLEET) OPS DURING THE MONTHS; FEB THRU JUN 2003. DURING THAT TIME; IT WAS COMMONLY ACCEPTED BY ALL CREWS I FLEW WITH; AND THOSE I SPOKE WITH; THAT WE WERE CONDUCTING OPS UNDER PART 91 OF THE FAA REGS. DURING MY LAST FLT ASSOCIATED WITH THE CRAF OP; I DISCOVERED UNDER MY COMPANY'S FAA APPROVED OP-SPECS THAT UNLESS ANNOTATED ON THE DISPATCH RELEASE; ALL OPS CONDUCTED WILL BE CONDUCTED UNDER PART 121 OF THE REGS. AS A RESULT OF THIS OVERSIGHT; I MISTAKENLY ALLOWED THE COCKPIT DOOR TO REMAIN UNLOCKED AND PAX TO ENTER AND EXIT AT WILL WHILE INFLT. THIS MISUNDERSTANDING IS A RESULT OF THE LACK OF CLR COMS ON THE PART OF FLT OPS. GRANTED; WITH SOME DEGREE OF DIFFICULTY; ANY LINE PLT INVOLVED COULD HAVE RESEARCHED AND UNCOVERED THE PERTINENT INFO. BUT; I BELIEVE WHEN NON STANDARD OPS OCCUR IT BEHOOVES THE CHIEF PLTS AND FLEET CAPTS INVOLVED TO CLRLY OUTLINE THE PARAMETERS OF THE OPS. IN THIS CASE A BULLETIN AND ADDITIONAL LANGUAGE IN THE RELEASE REMARKS OF OUR FLT RELEASE WOULD HAVE AVOIDED THIS MISUNDERSTANDING.