A B777-200 MECHANIC REPORTS ON BEING TOLD HE HAD INSTALLED THE ACFT CABIN DOOR EMERGENCY ASSIST BOTTLE BATTERY PACK UPSIDE DOWN. SYSTEM CONTINUED TO BE FUNCTIONAL.

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I WAS INFORMED OF AN INVESTIGATION INTO THE BATTERY PACK FOR A DOOR SLIDE INSTALLATION ON ACFT X THAT HAPPENED A FEW MONTHS PRIOR. I WAS TOLD THE MAINT INFO. I CALLED THE NUMBER GIVEN AT THAT TIME BUT COULD NOT GET HOLD OF ANYONE UNTIL XA30 AM THE NEXT MORNING. I SPOKE TO XXXXX AT THAT TIME AND HE TOLD ME THAT THE SLIDE PACK WAS INSTALLED UPSIDE DOWN AS FOUND ON 'C' CHK. HE ALSO TOLD ME THEY HAD FOUND ANOTHER ACFT THAT WAY AND THAT IT WAS STILL FUNCTIONAL INSTALLED THAT WAY. I DO RECALL THE ENGINEERING DIRECTIVE BECAUSE IT WAS THE FIRST TIME IT WAS DONE IN ZZZ TO MY KNOWLEDGE AND WE FOLLOWED THE JOB CARD CLOSELY AND TESTED IT AS CALLED OUT. IT WAS FUNCTIONAL TO THE BEST OF MY KNOWLEDGE AND SAFETY WAS NEVER COMPROMISED. THIS IS ABOUT THE BEST I CAN RECALL AFTER ALL THIS TIME. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THE ORIGINAL PAPERWORK PICTURE FROM ENGINEERING WAS VERY SKETCHY. HE REINSTALLED THE NEW BATTERY PACK IN THE SAME POSITION AS THE OLD PACK HE JUST REMOVED. THEY REMOVED THE SLIDE OFF OF THE DOOR AND PERFORMED A DOOR EMERGENCY OPENING WITH THE NEW BATTERY PACK JUST TO MAKE SURE THE DOOR WOULD OPEN. TEST WAS SUCCESSFUL. A NEW DOOR ASSIST BOTTLE WAS INSTALLED AND THE SLIDE PACK RE-ATTACHED TO THE DOOR. THE UPSIDE DOWN BATTERY PACK WAS FOUND DURING A 'C' CHECK. HIS MANAGER MENTIONED THE CARRIER WAS AWARE OF THE PAPERWORK PROBLEM AND A JOB CARD CHANGE WAS BEING MADE TO USE THE PART NUMBER ON THE BATTERY PACK AS A REFERENCE FOR THE PROPER POSITIONING OF THE PACK WHEN INSTALLED ON THE DOOR. REPORTER ALSO STATED THAT BOEING WILL ALSO MAKE CHANGES TO THEIR MAINT MANUAL.