What was found
DURING CRUISE, LOUD MECHANICAL CLANKING PULSATING NOISE FROM LT MAIN DECK JUST FWD OF THE LE, LASTED FOR THREE MINUTES NO EICAS MSGS ALL SYS APPEARED NORMAL. CHECKED ON GND FOUND NR 1 AIR CONDITIONING RAM AIR DOOR FWD SECTION RIPPED OFF & MISSING IN COMM WITH MCC. TRANSFERRED ITEM TO CDL 21-62-01, INLET REMOVED.