What was found
DURING DESCENT INTO NRT AT 15,000 FT, A LARGE BANG SOUND AND VIBRATION WAS EXPERIENCED. AFTER LANDING, FOUND THE NR 2 AIR CONDITION PACK ACCESS DOOR PANEL MISSING. ALSO, FOUND DAMAGE TO NR 3 AND NR 4 CANOE AND FUSELAGE PANEL 191KL. REPLACED THE NR 2 PACK DOOR AND NR 3 CANOE FORWARD FAIRING. REPAIRS MADE AS NECESSARY PER 51-40-09. AIRCRAFT RETURNED TO SERVICE.