"At 8:53 p.m. on August the 5th, 1997, Korean Air Flight 801 departed from Seoul Gimpo International Airport, carrying three flight crew, two pilots, and one flight engineer. There were 14 flight attendants, 237 passengers on board. The flight was bound for Antonio B. Won Pat International Airport in Guam, the U.S. Island territory in the Western Pacific Ocean. The flight was under the command of 42-year-old Captain Park Yong-chul, previously a pilot in the Republic of Korea Air Force."
"Visibility was considerably reduced, and the crew attempted an instrument landing. The airport had a Glideslope instrument landing system known as an ILS, which is a precision radio navigation system that provides short-range guidance to aircraft to allow them to approach a runway at night or in bad weather. This was out of service. However, Captain Park mistakenly believed it was in service when he picked up a signal from another unrelated electronic device on the ground."
Korean Air Flight 801 departed Seoul Gimpo on August 5, 1997, bound for Guam with three flight crew, 14 flight attendants, and 237 passengers. Captain Park Yong-chul had nearly 9,000 flight hours; the first officer had over 4,000 hours and the flight engineer over 13,000 hours. Heavy rain and reduced visibility required an instrument approach. The runway glideslope ILS was out of service, but the captain misidentified a signal from an unrelated ground device as the glideslope. Cockpit voice recordings captured crew concern about weather, and air traffic control notified the crew that the glideslope was unusable without acknowledgement.
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