What happened
On October 23, 2022, Korean Air Flight 631, a scheduled international service connecting Incheon International Airport in South Korea to Mactan-Cebu International Airport in the Philippines, encountered significant technical difficulties upon arrival. The aircraft, identified as an Airbus A330-300 with registration HL8345, was executing its landing approach at Cebu.
During the touchdown phase, the flight crew experienced a critical malfunction within the hydraulic system. This failure compromised the aircraft's ability to decelerate effectively after contacting the runway surface. Consequently, the Airbus A330-300 continued beyond the designated stopping point, overrunning the runway end. Despite the severity of the mechanical failure and the resulting excursion, the emergency response protocols were activated immediately.
Investigation
Post-incident analysis focused on the specific nature of the hydraulic system malfunction that precipitated the overrun. Investigators examined the flight data recorder and cockpit voice recorder to reconstruct the sequence of events leading up to the landing. The primary focus was determining why the braking and thrust reversal systems, which rely heavily on hydraulic pressure, failed to function as designed during the critical deceleration phase.
The investigation also assessed the structural integrity of the aircraft following the runway excursion and reviewed the effectiveness of the crew's response to the emergency. Authorities verified that all safety systems were accounted for and that the failure was isolated to specific hydraulic components rather than a total system collapse.
Findings
The inquiry concluded that the hydraulic system failure was the primary factor leading to the runway overrun. This mechanical defect prevented the aircraft from achieving sufficient deceleration, resulting in the excursion beyond the runway limits. While the incident caused significant property damage and required extensive maintenance, the outcome for human life was mitigated by effective emergency procedures.
The final report highlighted that 20 people were injured during the event, primarily due to the sudden deceleration forces and evacuation procedures. However, there were no fatalities among the passengers and crew on board. The findings underscored the importance of redundant systems in hydraulic networks and the need for continued monitoring of aging aircraft components to prevent similar occurrences.