Aircraft Accident Report: Controlled Flight Into Terrain, Korean Air Flight 801, Boeing 747-300, HL7468, Nimitz Hill, Guam, August 6, 1997

NHTSA · 2000 · ROSA P / United States. National Transportation Safety Board

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Summary

This National Transportation Safety Board (NTSB) report investigates the August 6, 1997, crash of Korean Air Flight 801, a Boeing 747-300, which resulted in a controlled flight into terrain (CFIT) at Nimitz Hill, Guam. The accident, which killed 228 of the 254 people on board, was motivated by the need to determine the causal factors behind the aircraft’s descent below safe altitudes during an instrument approach in poor weather conditions. The investigation focused on flight crew performance, approach procedures, pilot training, air traffic control (ATC) operations, and regulatory oversight. The NTSB conducted a comprehensive analysis using data from flight recorders, radar tracks, weather reports, and witness statements. The investigation examined the flight crew’s briefing and execution of a nonprecision localizer-only approach, noting that the glideslope was unusable. It also analyzed the performance of FAA air traffic controllers and the status of the Minimum Safe Altitude Warning (MSAW) system at Guam International Airport. Additionally, the report reviewed Korean Air’s training protocols, crew resource management, and the oversight provided by both the Korean Civil Aviation Bureau and the Federal Aviation Administration. The findings revealed that the probable cause was the captain’s failure to adequately brief and execute the nonprecision approach, compounded by the first officer’s and flight engineer’s failure to effectively monitor and cross-check the captain’s actions. The captain initiated a premature descent, confusing the nonprecision procedure with a precision approach, and failed to recognize the aircraft’s proximity to terrain. Contributing factors included the captain’s fatigue, stemming from irregular rest periods, and inadequate flight crew training regarding nonprecision approaches. Furthermore, the FAA intentionally inhibited the MSAW system at Guam, which failed to alert controllers to the aircraft’s dangerously low altitude. The report also identified deficiencies in emergency response planning and regulatory oversight. The significance of this report lies in its detailed examination of systemic safety failures in aviation. It highlights critical issues in crew resource management, the dangers of CFIT during nonprecision approaches, and the importance of functional terrain warning systems. The NTSB issued safety recommendations to the FAA, the Governor of Guam, and the Korean Civil Aviation Bureau to improve pilot training, enhance approach procedures, restore and manage MSAW systems effectively, and strengthen regulatory oversight. These recommendations aim to prevent similar accidents by addressing gaps in human performance, technology, and organizational safety management.

Key finding

The probable cause of the accident was the captain's failure to adequately brief and execute the nonprecision approach and the first officer's and flight engineer's failure to effectively monitor and cross-check the captain's execution of the approach.

Methodology

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