About 01:41:01, the Agana tower controller cleared flight 801 to land. The first officer contacted the Agana tower: "Korean air eight zero one intercept the localizer six left." The airplane was descending below 2,000 feet msl at a point 6.8 nm from the runway threshold (3.5 nm from the VOR). please set it." An unidentified voice in the cockpit then responded, "yes." About 01:40:42, the CERAP controller instructed flight 801 to contact the Agana control tower. About 01:40:22, an unidentified voice in the cockpit said, "glideslope is incorrect." As the airplane was descending through 2,400 feet msl, the first officer stated, "approaching fourteen hundred." About 4 seconds later, when the airplane was about 8 nm from the runway 06L threshold, the captain stated, "since today's glideslope condition is not good, we need to maintain one thousand four hundred forty. The flight engineer asked, "is the glideslope working? glideslope? yeh?" One second later, the captain responded, "yes, yes, it's working." About 01:40, an unidentified voice in the cockpit stated, "check the glideslope if working?" This statement was followed 1 second later by an unidentified voice in the cockpit asking, "why is it working?" The first officer responded, "not useable." The altitude alert system chime sounded and the airplane began to descend from an altitude of 2,640 feet msl at a point approximately 9 nm from the runway 06L threshold. One minute later the controller stated, "Korean Air eight zero one cleared for ILS runway six left approach.glideslope unusable." The first officer responded, "Korean eight zero one roger.cleared ILS runway six left " his response did not acknowledge that the glideslope was unusable. At that time, flight 801 was descending through 2,800 feet msl with the flaps extended 10° and the landing gear up. After this transmission, the flight crew performed the approach checklist and verified the radio frequency for the ILS to runway 06L.Ībout 01:38 the CERAP controller instructed flight 801 to ".turn left heading zero nine zero join localizer " the first officer acknowledged this transmission. At 01:24 requested a deviation 10 miles to the left to avoid severe weather.Īt 01:31 the first officer reported to the CERAP controller that the airplane was clear of cumulonimbus clouds and requested "radar vectors for runway six left." The controller instructed the flight crew to fly a heading of 120°. In case of go-around, since it is VFR, while staying visual and turning to the right.request a radar vector.if not, we have to go to FLAKE.since the localizer glideslope is out, MDA is five hundred sixty feet and HAT is three hundred four feet."Ībout 01:13 the captain said, "we better start descent " shortly thereafter, the first officer advised the controller that flight 801 was "leaving four one zero for two thousand six hundred." During the descent it appeared that the weather at Guam was worsening. I will add some more speed above the target speed. The captain then began briefing the first officer and the flight engineer about the approach and landing at Guam: "I will give you a short briefing.ILS is one one zero three.NIMITZ VOR is one one five three, the course zero six three, since the visibility is six, when we are in the visual approach, as I said before, set the VOR on number two and maintain the VOR for the TOD, I will add three miles from the VOR, and start descent when we're about one hundred fifty five miles out. About 01:10, the controller instructed flight 801 to ".descend at your discretion maintain two thousand six hundred." The first officer responded, ".descend two thousand six hundred pilot discretion." The CERAP controller told flight 801 to expect to land on runway 06L. Upon arrival to the Guam area, the first officer made initial contact with the Guam Combined Center/Radar Approach Control (CERAP) controller about 01:03, when the airplane was level at 41,000 feet and about 240 nm northwest of the NIMITZ VOR/DME. ![]() The Boeing 747-300 departed the gate about 21:27 and was airborne about 21:53. Korean Air Flight 801 was a regular flight from Seoul to Guam. Won Pat International Airport (GUM/PGUM), Guam Seoul-Gimpo (Kimpo) International Airport (SEL/RKSS), South Korea Accident investigation report completed and information capturedĤ,8 km (3 mls) SW of Guam-Agana International Airport (GUM) ( Guam)
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