AN ACR FO REPORTED ACCIDENTALLY LEAVING AN ENG RUNNING AFTER PARKING AT THE GATE. HE CITES FATIGUE AND DISTRACTION AS FACTORS IN THE INCIDENT.

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WE ARRIVED AT THE GATE AND COMPLETED THE SHUTDOWN CHKLIST. AFTER THE PAX DEPLANED; THE CAPT WENT INTO THE TERMINAL AND I REMAINED ON BOARD. THE GND CREW MAN CALLED ON THE INTERPHONE TO TELL ME THE GND PWR WAS CONNECTED. I CONFIRMED THAT WE WERE USING IT AND THANKED HIM. I GOT UP TO TALK TO THE PURSER FOR A COUPLE MINS; THEN RETURNED TO THE COCKPIT AND STARTED LOADING THE FMGC. THE GND CREW MAN CALLED AGAIN AND ASKED WHEN WE WERE GOING TO SHUT DOWN THE #1 ENG. I LOOKED OVER AND; TO MY AMAZEMENT; IT WAS STILL RUNNING! I THANKED HIM AGAIN AND SHUT IT DOWN. I CAN'T REMEMBER THE LAST TIME I DID SOMETHING SO MORONIC. I THINK THERE ARE 4 FACTORS THAT CAUSED ME TO MISS THIS IMPORTANT ITEM. FIRST; CHRONIC FATIGUE. MOST PLTS I HAVE TALKED TO AGREE THAT AT THIS POINT IN THE PROGRAM; A FEW DAYS OFF AT HOME GETS YOU RESTED ENOUGH TO FLY; BUT NOT UP TO 100% ALL THE TIME. ONLY EXTENDED TIME AWAY WILL DO THAT; AND IT'S ALMOST IMPOSSIBLE ANYMORE TO GET A TRIP DROP BTWN TWICE A YR VACATIONS. SECONDLY; ACUTE FATIGUE. ALL LAST MONTH I FLEW LATE TRIPS; GETTING UP LATE AND FINISHING LATE. AFTER A FEW DAYS OFF; I AM FLYING AN EARLY TRIP WITH AN XA30 BRAIN-TIME WAKE-UP. EVEN THOUGH I SLEPT OK; I THINK THAT IT DOESN'T TAKE AS MUCH AS IT NORMALLY DOES TO BECOME TIRED AGAIN. I DIDN'T REALLY FEEL TIRED; BUT PERFORMANCE SUFFERS BEFORE YOU REALLY NOTICE IT. THIRDLY; DISTRS. THIS WAS THE SECOND DAY THAT WE FLEW THIS PARTICULAR AIRPLANE THAT HAD A RECURRING WRITE-UP OF BOTH ACARS LOCKING UP. AFTER EVERY FLT; MINE SEEMED TO LOCK UP AS THE CABIN DOOR WAS OPENED SO I COULD NOT SEND THE 'IN' RPT. I CAN'T SPECIFICALLY REMEMBER THE SEQUENCE OF ACTIONS; BUT I DO REMEMBER SCREWING WITH THE ACARS TRYING TO SEND THE 'IN' RPT ABOUT THE SAME TIME AS SHUTTING DOWN. I SUSPECT THAT I LOST MY SEQUENCE OF ACTIONS; TRIED TO FIX THE ACARS AND THEN FORGOT ABOUT THE ENG. LASTLY; COMPLACENCY. WE DO THE CHKLIST MULTIPLE TIMES A DAY; MULTIPLE DAYS A MONTH AND CAN DO IT ROTE WHILE SLEEPING. I HAVE ALWAYS MADE A CONSCIOUS EFFORT TO ACTUALLY LOOK AT THE ITEMS AS THE CAPT RESPONDS; SO I WAS BLOWN AWAY THAT I ACTUALLY MISSED THE ENG MASTER SWITCH ON AND THE ACTUAL FUEL FLOW. I GUESS IT WAS A CASE OF SEEING IT AND NOT REALIZING WHAT I WAS SEEING; AS I 'SAW' WHAT I EXPECTED TO SEE. THAT THE SAME THING HAPPENED TO THE CAPT AT THE SAME TIME IS REALLY SCARY. WHAT ARE THE ODDS? I FEEL COMPLETELY EMBARRASSED THAT I COULD DO THIS AND AM JUST GLAD NO ONE GOT HURT. YOU CAN NEVER BE TOO CAREFUL NO MATTER HOW CAREFUL YOU THINK YOU ARE BEING.