B757-200 FO DISCOVERS COCKPIT DOOR LOCKING MECHANISM FAILED TO PREVENT DOOR FROM OPENING. IS CONCERNED A REQUIRED SECURITY CHECK PRIOR TO EACH FLT IS NOT BEING PERFORMED BY CABIN ATTENDANTS.

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AFTER FLT ATTENDANT CLOSES THE FLT DECK DOOR; I PERFORM NORMAL DOOR SECURITY CHKS WITH THE ADDED STEP OF PHYSICALLY AND MECHANICALLY ENSURING THAT THE FLT DECK DOOR IS SECURED AND WILL NOT OPEN. I LISTENED AND HEARD FLT ATTENDANT CHK FOR DOOR CLOSURE AND SECURITY BY HIS PULLING ON THE DOOR. I THEN GOT UP AND PUSHED ON FLT DECK DOOR TO ENSURE AND MANUALLY CHK FOR LOCK FUNCTION. WITH ALL INDICATIONS NORMAL (RED TOGGLE SWITCH CLOSED; NO FAIL LIGHT) DOOR PUSHED OPEN. RECHK WAS PERFORMED AND DOOR LOCK FAILED WITH ALL NORMAL INDICATIONS. MAINT NOTIFIED AND DOOR LOCK DEFERRED WITH USE OF DEADBOLT. I AM VERY CONCERNED THAT IT SEEMS I AM ONE OF THE FEW FLT OFFICERS PERFORMING THIS PREFLT CHK. THE FLT ATTENDANT CHK IS DIFFICULT BECAUSE THEY MUST PULL THE DOOR TO CHK SECURITY. THE FLT ATTENDANT CHK ONLY OCCURS 50% OF THE TIME WITH MANY NOT KNOWING THAT IT IS REQUIRED. POLICY AND PROCS MUST BE CHANGED AND ENHANCED TO REQUIRE THE CHK BE MADE ON THE PLT SIDE OF THE DOOR. THIS WAS AN EXAMPLE OF A FAILURE OF THE CURRENT POLICY AND A COMPLETE LOSS OF FLT DECK DOOR SECURITY WITH NO ELECTRONIC INDICATION OF LOCK FAILURE. THIS IS SERIOUS AND SOP MUST BE REVIEWED.