Antonio B. Won Pat International Airport
Contributing to the accident was the Federal Aviation Administration's intentional inhibition of the minimum safe altitude warning system at Guam and the agency's failure to adequately manage the system.The investigation report stated that a contributing factor was that the ATC Minimum Safe Altitude Warning (MSAW) system at Antonio B. Won Pat International Airport had been deliberately modified so as to limit spurious alarms and could not detect an approaching aircraft that was below minimum safe altitude. The probable cause of the accident was the captain's poor execution of the non-precision approach, the captain's fatigue, poor communication between the flight crew, and Korean Air's lack of flight crew training.