B757 AND A300 ACFT CHECKED IN ZZZ HAD SECURITY STICKERS BLOCKING ALL LAV EMER OXYGEN PANELS AND LAVATORY SMOKE DETECTORS.

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ACFT X INBOUND ZZZ ON JUN/WED/05. APPROX XA00; ALL LAVS FOUND WITH OXYGEN PANELS STICKERED SHUT. THE INSTALLATION OF THOSE SECURITY STICKERS PREVENT DEPLOYMENT OF THE LAV O2 PANELS IN THE EVENT OF AN EMER. SOMEONE COULD SUFFOCATE IN THE LAV; SHOULD O2 BECOME REQUIRED IN FLT. TODAY I CAME ACROSS ACFT Y IN ZZZ AND I FOUND INT'L SECURITY STICKERS INSTALLED OVER THE CEILING O2 DROP PANELS AT ALL FIVE LAVS; SEE ENCLOSED PHOTOS. I ALSO ENCLOSED OTHER PHOTOS OF OTHER ACFT I CAME ACROSS WITH THE SAME ISSUE. THE PHOTOS FOR ACFT Y ARE LABELED ACCORDINGLY. I ALSO MADE FIVE SEPARATE MAINT ENTRIES IN ACFT Y ON THE SECURITY STICKERS. YOU CAN PULL THEM OUT FROM UNDER FMR ATA CHAPTER 2540. THESE ARE SOME MORE INSTANCES WITH PHOTOS WHERE THE SECURITY STICKERS HAVE BEEN PLACED OVER THE LAV OXYGEN PANELS PREVENTING DEPLOYMENT OF THE PANEL AND OXYGEN MASKS IN THE EVENT OF AN EMER. THIS IS A DAILY OCCURRENCE. I AM SUPPLYING YOU WITH PHOTOS OF ACFT Z DATED MAY/SAT/05 AND ACFT Y DATED JUN/TUE/05. PLEASE SEE THE ATTACHMENTS FOR YOUR REVIEW. I RECOMMEND THAT A MAINT CHECK CARD BE ISSUED IMMEDIATELY TO CORRECT THE B757 FLEET; AS WELL AS THE A300 FLEET. BESIDES THE OXYGEN PANELS; WE HAVE ALSO FOUND THESE SECURITY STICKERS ON LAV SMOKE DETECTORS. THE STICKERS HAVE BLOCKED CRITICAL AIRFLOW TO THESE UNITS; LIGHTS AND HORNS. TSA REQUIREMENTS CANNOT COMPROMISE THE SAFETY OF ANY ONE AT ACR X OR OUR PAX. PLEASE ADDRESS THIS CRITICAL SAFETY ITEM IMMEDIATELY.