A fatal misunderstanding of a single electronic signal
In short: On August 6, 1997, Korean Air Flight 801 crashed into Bijia Peak in Guam. A mistaken belief that a landing signal was active, combined with poor crew communication and a modified warning system, turned a routine approach into the deadliest aviation accident in American dependent territory.
The crash of the Boeing 747-300 was driven by a cascade of human and systemic failures. Captain Park Yong-chul, who had nearly 9,000 hours of flight time, mistakenly believed the aircraft was receiving a glideslope signal. In reality, the crew had picked up an irrelevant signal from an electronic device on the ground. This error occurred during a non-precision approach in heavy rain and reduced visibility.
The National Transportation Safety Board (NTSB) identified several critical contributing factors. Beyond the captain's poor decision-making and fatigue, the crew failed to effectively monitor the approach. Despite the first officer and flight engineer noticing the steep descent and the lack of visibility, they did not explicitly warn the captain or challenge his errors until six seconds before impact. This highlighted known issues regarding subordinate officers' ability to challenge captains.
Systemic failures extended to air traffic control and safety technology. Investigators from the NTSB determined that the MSAW (Minimum Safe Altitude Warning) at Antonio B. Won Pat International Airport underwent deliberate changes to reduce false alerts, meaning it failed to identify the plane flying under the minimum safe altitude. Additionally, air traffic controller Kurt James Mayo failed to follow standard procedures, such as monitoring the aircraft after the crew switched to the tower frequency.
The disaster resulted in 229 deaths out of 254 people on board. The crash occurred near the NIMITZ VOR, a navigation beacon located on Bijia Peak. The aircraft struck the terrain at an altitude of 660 feet, just short of the runway, due to the crew's failure to maintain the required minimum safe altitude of 1,440 feet.
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- Summary by Intellect · source: Korean Air Flight 801
- Also: DOT ROSA P
- Also: Wikidata — Korean Air Flight 801 · CC0
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