AN AIRBUS PARKED ON A GATE AFTER A POSITIONING FERRY HAS DOOR 1 L SLIDE DEPLOYED INADVERTENTLY BY THE FLC.

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WE WERE FERRYING A NEW ACFT FROM MAINT TO PHL TO PUT INTO SVC. UPON ARR AT THE GATE; I GOT UP AND PULLED THE SAFETY PIN FROM THE HOLDER IN THE DOOR AND INSTALLED INTO SLOT AFTER MOVING SLIDE ARM/DISARM LEVER TO DISARM. WHEN I PULLED THE DOOR HANDLE TO OPEN DOORS; THE DOOR BEGAN TO PULL OUT OF MY HAND AS SLIDE INFLATED. OUR PROC HAS A CHKLIST TO DO FOR PREFLTING CABIN FOR DEP WITH A FLT WITHOUT FLT ATTENDANTS BUT NOT FOR ARR AT GATE. IN OUR PROCS; A FLT ATTENDANT IS TO STEP INTO COCKPIT TO CONFIRM ON ECAM THAT THE SLIDES ON THE DOOR PAGE ARE SHOWING DISARMED WITH CAPT. UPON ARR AT THE GATE; SEATBELT/PED SIGNS ARE TURNED OFF. OBVIOUSLY; ON A FLT WITHOUT FLT ATTENDANTS THIS IS NOT ACCOMPLISHED AND THERE'S NOT A CHKLIST OR PROC FOR ARR IN OUR BOOK ADDRESSING THIS SIT. AFTER GATE ARR ON FERRY FLTS; I USUALLY JUMPED OUT OF MY SEAT TO GO BACK AND DISARM ALL THE SLIDES PRIOR TO THE JETWAY BEING PUT UP TO ACFT AND CATERING/MAINT VEHICLES OPENING DOORS. I DID NOT CONFIRM SLIDES DISARMED ON ECAM SO I AM NOT SURE IF IT WAS ELECTRONICALLY DISARMED PRIOR TO ME BEGINNING TO OPEN DOOR HANDLE. INCLUDED THIS IN MAINT WRITE-UP SO MAINT COULD CHK TO SEE IF MALFUNCTIONING SYS (NEW ACFT) PRIOR TO PUTTING BACK INTO SVC. IF THIS DOOR IS OPENED FROM THE OUTSIDE BY AGENT -- EVEN WITH DOOR SLIDE ARMED -- IT IS SUPPOSED TO NOT INFLATE. FORTUNATELY; IN THIS SIT; PERSONNEL AND JETWAY WERE NOT NEAR ACFT AND NO ONE WAS HURT OR JEOPARDIZED. I HAD FERRIED NEW ACFT BACK INTO SVC 3 OR 4 TIMES PRIOR TO THIS INCIDENT AND HAD DONE IT THE SAME EVERY TIME.