What was found
(CAN) THE CHIP DETECTOR HOUSING ATTACHMENT BOLTS WERE FOUND TO BE CRACKED ON THE NR 1 ENGINE, RESULTING IN ONLY THE O-RING AND LOCKWIRE HOLDING THE CHIP DETECTOR HOUSING IN PLACE PREVENTING AN IN-FLIGHT SHUTDOWN. THIS HAS OCCURRED PREVIOUSLY 150 HOURS PRIOR, AND AT THIS TIME THE HOUSING WAS INSTALLED IAW THE MM. THE COMPANY IS DOING A DETAILED INSPECTION OF THE HOUSING EVERY 50 HOURS FOR THE NEXT 500 HOURS.