A B767-300 MECHANIC DESCRIBES THE CHAIN OF EVENTS THAT LED TO THE RIGHT OVERWING SLIDE DOOR DEPLOYING. SQUIB HAD FIRED.

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WHILE ASSIGNED TO THE FOLLOWING PROCS OUTLINED IN THE PAPERWORK; FINISHED OUTSIDE AND PROCEEDED TO THE CABIN TO FINISH STEPS 1C THROUGH G. BEFORE CONNECTING BATTERY; CHKED ALL TOGGLE SWITCHES FOR CORRECT POS BEFORE MOVING TOGGLE ARM TO THE UP POS. MOVED TOGGLE TO THE UP POS AND CLOSED BOTH PANELS. LAST STEP WAS CONNECTING THE BATTERY. AFTER CONNECTING BATTERY WENT TO COCKPIT TO CHK LIGHTS. L-HAND SIDE GOOD; R-HAND SIDE NO LIGHTS. WENT DOWN TO CHK R-HAND SIDE AND FOUND SLIDE DOOR DEPLOYED. PROPER TRAINING ON 'B' CHK PROCS. WITH INSPECTION BACK CHK ON STEPS 1C THROUGH G. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THE ACFT WAS IN FOR MAINT WORK EARLIER AND THE SPOILER LOCKS HAD JUST BEEN REMOVED. THIS RIGHT OVERWING SLIDE DOOR PANEL DEPLOYMENT WAS THE RESULT OF TOO MANY PEOPLE INVOLVED WITH THE ACFT WHILE THE OVERWING SLIDE REACTIVATION PROCEDURE WAS IN PROGRESS. THIS CAUSED THE SLIDE REACTIVATION PROCESS TO BE OUT OF SEQUENCE WITH THE JOB CARD. THE INBOARD SPOILER PANEL BLOW-DOWN SQUIB ALSO FIRED; DRIVING THE SPOILER DOWN. FORTUNATELY; THE SPOILER LOCKS HAD BEEN REMOVED AND NO OTHER WORKER WAS IN THE AREA AT THAT TIME. REPORTER ALSO STATED THAT ANOTHER SIMILAR TYPE INCIDENT OF OVERWING SLIDE DOOR PANEL DEPLOYMENT OCCURRED SHORTLY AFTER HIS INCIDENT.