What was found
ON DESCENT LHR STRONG OZONE ODOR FWD CABIN-FLIGHT DECK. DEBRIEFED FLIGHT AND CABIN CREW. ODOR NOTED AROUND 18,000FT AND CLEARED AFTER SHORT TIME (APPROX 5 MINS). NO OTHER FLIGHT DECK OR CABIN EFFECTS. NO SMOKE OR HAZE. CONFERRED WITH TOMC AND ACP'D CHECKS REF FIM 21-00-808 OF AIR CONDITIONING, GALLEY AND ENTERTAINMENT SYSTEMS, AND CABIN LIGHTING. ODOR WAS NOTED IN FIRST AND BUSINESS WITH NO PREVIOUS HISTORY. ITEM RAISED FOR RECIRC FILTERS REPLACEMENT.