A B767-300 WAS DISPATCHED IN NON COMPLIANCE WITH POSSIBLE DEFECTIVE PAX OXYGEN CANISTERS DUE TO NO INSPECTION. CAUSED BY JOB CARD DEFICIENCY.

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DURING BACK CHECK OF OXYGEN GENERATORS PIN'S AND S/N'S PER JOB CARD CEILING PANELS WITH OXYGEN GENERATORS AT SEATS ROWS 21; 27; 32; AND 36 WERE NOT OPEN AND WAS INDICATED TO ME NO OXYGEN GENERATORS WERE INSTALLED AT THESE POSITIONS. I HAD N/A THESE ROWS BY MISTAKE. THE JOBCARD IS NOT CLEAR ABOUT LOCATIONS AND GENERATORS ARE NOT ACCESSIBLE AS ALL OTHERS ON AIC. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE JOB CARD WAS FOR A B767-300 BUT DID NOT APPLY TO THE SEATING CONFIGURATION IN THIS AIRPLANE. THE RPTR SAID THE INSPECTION WAS TO FIND SOME SUSPECTED DEFECTIVE PAX OXYGEN CANISTERS. THE RPTR STATED THE CANISTERS ARE NORMALLY LOCATED ABOVE OVERHEAD ACCESS PANELS SECURED WITH CAM LOCK FASTENERS FOR EASY ACCESS. THE RPTR SAID THE JOB CARD MADE NO MENTION OF THESE ADDED CANISTERS AND THE FACT THEY WERE LOCATED ABOVE ACCESS PANELS THAT WERE FASTENED WITH SCREWS AND WERE NOT VISIBLE WITH THE OVERHEAD PANEL DOWN. THE RPTR STATED THE JOB CARD WAS WRONG. CALLBACK FROM ACN 527490: THE RPTR STATED THE JOB CARD FOR CANISTER INSPECTION DID NOT GIVE THE CORRECT LOCATION OF THE CENTER AISLE CANISTERS. THE RPTR SAID IN ROW 27 THE INFLT ENTERTAINMENT PROJECTOR CONCEALS THE CANISTERS AND IS NOT NOTED ON THE JOB CARD.