What happened
On 20 August 2007, China Airlines Flight 120, a scheduled international service from Taiwan Taoyuan International Airport to Naha Airport in Okinawa, Japan, arrived at its destination. The flight was operated by a Boeing 737-800 aircraft. As the plane landed and began taxiing toward the gate area at Naha Airport, a catastrophic event occurred. The aircraft suddenly caught fire and subsequently exploded.
The incident resulted in injuries to four individuals: three people aboard the aircraft and one member of the ground crew. Despite the severity of the fire and explosion, the vast majority of passengers and crew survived the ordeal. However, the damage to the airframe was so extensive that the Boeing 737-800 involved in the incident was declared a total loss and written off.
Investigation
Following the accident, authorities conducted a thorough investigation to determine the root cause of the fire. The inquiry focused on the mechanical integrity of the aircraft's fuel system and the specific circumstances leading to the ignition source.
The investigation established that the fire originated from a mechanical failure within the fuel tank. Specifically, it was determined that a loose bolt had become dislodged and punctured the fuel tank. This breach allowed fuel to escape or ignite, leading to the rapid spread of fire and the subsequent explosion observed by witnesses on the ground and aboard the aircraft.
Findings
The primary contributing factor identified in the report was the mechanical defect involving the bolt within the fuel system. The loose bolt's action of puncturing the tank created the necessary conditions for the fire to start. This finding highlights a critical maintenance or assembly oversight that led directly to the hazardous situation. The severity of the outcome, including the destruction of the aircraft and injuries sustained, underscores the importance of rigorous inspection protocols for internal aircraft components.