Investigation Summary
The flight was a multi-leg journey from Baghdad to Seoul with scheduled stops in Abu Dhabi and Bangkok. During the first leg, two North Korean agents, Kim Sung-il and Kim Hyon-hui, traveling under false Japanese passports as 'Shinichi Hachiya' and 'Mayumi Hachiya', boarded the aircraft. They carried a sophisticated improvised explosive device (IED) consisting of 350 grams of C4 plastic explosive hidden in a Panasonic radio and a liquor bottle containing PLX liquid explosive. The agents set the timer for nine hours and placed the device in the overhead bin above seat 7B before disembarking in Abu Dhabi. The aircraft continued toward Bangkok but exploded at 37,000 feet near the TAVOY waypoint. Following the disappearance, South Korean and international authorities tracked the suspects to Bahrain. When confronted by officials, both agents attempted suicide by biting into cyanide-laced cigarettes. Kim Sung-il died, but Kim Hyon-hui survived, was extradited to South Korea, and eventually confessed to the plot, stating she acted on direct orders from Kim Jong Il. While small pieces of debris were found shortly after the crash, a 2020 news report by MBC and Simple Flying indicated that a large section of fuselage, believed to be from HL7406, was located by sonar at a depth of 170 feet in the Andaman Sea.
Final Conclusions
The investigation concluded that the aircraft was destroyed by an intentional act of state-sponsored terrorism. The primary evidence included the recovery of wreckage showing outward explosive force and the detailed confession of the surviving agent. The motive was identified as an attempt to destabilize South Korea and discourage international participation in the 1988 Summer Olympics in Seoul.
Photographic Evidence (1)
Video Analysis
No video analysis linked for this case file yet.
Systems & Failure Modes
Improvised Explosive Device (IED)
A dual-component bomb using C4 for the main charge and PLX liquid explosive, triggered by a radio-based timer.
Overhead Storage Bin
The location where the bomb was placed, specifically above seat row 7 in the forward economy cabin.
Interesting Facts
- 01The bomb was composed of C4 plastic explosive and PLX liquid explosive.
- 02The timing device was a modified battery-operated portable transistor radio.
- 03The aircraft was a Boeing 707-3B5C manufactured in 1971 and was originally delivered to Pan American World Airways (Pan Am) as N446PA before being acquired by Korean Air.
- 04All 115 occupants, including 104 passengers and 11 crew members, perished.
- 05The surviving bomber, Kim Hyon-hui, was sentenced to death but later pardoned by President Roh Tae-woo.
Safety Actions & Advisories
State Sponsor of Terrorism Designation
Following the incident, the United States added North Korea to its list of State Sponsors of Terrorism.
Enhanced Airport Security
The bombing led to significantly tightened security protocols for international flights, particularly regarding transit passengers and carry-on electronics.