THE JETWAY WAS PULLED FROM A B737-500 AND THE DOORS WERE ARMED. A COCKPIT CALL WAS MADE TO INFORM THE FLT ATTENDANTS THAT MAINT WOULD BE ARRIVING AT DOOR 2L. THE EVAC SLIDE WAS NEARLY DEPLOYED AS THE MECHANIC ATTEMPTED TO OPEN THE DOOR.

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PURSER MADE THE ARMING ANNOUNCEMENT AFTER THE JETWAY WAS PULLED FROM ACFT TO ARM DOORS; WHICH WAS COMPLETED. THEN WE PROCEEDED TO OUR ASSIGNED DEMO POS. WHILE STANDING IN OUR DEMO POS; THE FLT DECK CALLED 1L. I WAS WALKING TOWARDS THE FRONT OF THE ACFT TO SEE WHEN THE DEMO WAS GOING TO START; SO I ANSWERED THE PHONE FROM THE FORWARD JUMPSEAT. THE CAPT ADVISED THAT MAINT WAS GOING TO ENTER THROUGH 2L. AS I TURNED TO GO BACK TO THE DOOR; I NOTICED THE DOOR HAD ALREADY BEEN OPENED; AND I STARTED RUNNING TO THE BACK. WHEN I ARRIVED AT 2L; I NOTICED THE SLIDE PACK WAS ON THE GALLEY FLOOR. I IMMEDIATELY PUT ALL MY WT ON THE DOOR HANDLE TO STOP THE MAINT PERSONNEL FROM OPENING THE DOOR. AT THIS POINT; THE SLIDE HAD COME APPROX 1/2 WAY OUT OF THE DOOR PAN COVER. I GOT ON THE PA AND CALLED ANOTHER FLT ATTENDANT TO THE REAR OF THE ACFT. AS HE HELD THE HANDLE; I TOLD THE MECH TO COME TO 2R; AND I DISARMED AND CRACKED THE 2R DOOR. MAINT TOOK OVER THE SITUATION. (SLIDE DID NOT INFLATE.) SLIDE WAS REPACKED AND WE PROCEEDED ON.