A B757 PURSER WORRIED ABOUT HIS AUTOMATIC REACTION TO OPEN THE DOOR WHEN HE SHOULD HAVE BEEN SECURING THE DOOR FOR PUSHBACK.

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ACR PROC ON DEP IS FOR THE GATE AGENT TO CLOSE THE ACFT DOOR. THEN THE PURSER IS TO MAKE A PA TO ARM THE DOORS. THIS I DID. I THEN WENT TO THE 1R DOOR; ARMED IT; LEARNED FROM THE OTHER FLT ATTENDANT THAT THE DOORS WERE ARMED AND TOLD THE CAPT THE CABIN WAS READY. I THEN RETURNED TO RWY 1L TO ARM IT. OUR PROC IS THAT THE BOARDING DOOR IS NOT ARMED UNTIL THE JET BRIDGE IS PULLED AWAY. I THEN LOOKED OUT THE PEEP HOLE; SAW THE JETBRIDGE WAS AWAY; ARMED THE DOOR; AND THEN PROCEEDED TO LIFT THE DOOR CTL HANDLE IN 1 MOTION. I THEN STOPPED IN FEAR; FOR THERE WAS NO REASON; WHATSOEVER; TO OPEN THE DOOR EITHER ARMED OR DISARMED. I THEN PUSHED THE HANDLE BACK DOWN INTO THE CLOSED AND LOCKED POS. WHY DID I DO THIS? I CAN ONLY OFFER SOME IDEAS: 1) I RARELY FLY THIS AIRPLANE. IN FACT; I HAVE NOT WORKED THIS PLANE IN 3 MONTHS. MY MOST INTENSE KNOWLEDGE OF THIS PLANE IS FROM TRAINING. 2) IN RECURRENT TRAINING; WE TEND TO DO THE DRILL RAPIDLY AND I WONDER IF THE ARMING AND OPENING OF THE DOOR CAME TOO CLOSE TOGETHER. 3) I HAD BEEN OFF WORK FOR ABOUT 5 WKS; AND THIS WAS MY FIRST TRIP BACK. 4) BOARDING WAS HECTIC AND AS PURSER/#1 ON THIS PLANE; ACR REQUIRES YOU TO ACT AS THE GALLEY FLT ATTENDANT; AS WELL AS PURSER. SO; NOT ONLY MUST YOU COUNT CATERING AND MAKE SURE ALL GALLEY SUPPLIES ARE ACCOUNTED FOR; YOU ALSO MUST GREET PAX; MAKE PA DURING BOARDING; AND ADDRESS ISSUES BROUGHT BY AGENTS; CREW; AND PAX.