On November 4, 1993, Flight 605, a scheduled passenger service from Taipei to Hong Kong, became one of the most analyzed incidents in modern aviation history. Operated by China Airlines with a Boeing 747-400, the flight ended with the aircraft skidding off the runway and into Victoria Harbour, marking a pivotal moment for the carrier. While all passengers and crew were rescued, the event raised significant questions about technology, training, and the human factors inherent in high-pressure operations.
The Flight and the Incident
Flight 605 was a routine overnight service, carrying 396 passengers and 17 crew members on what should have been a standard 135-minute journey. As the Boeing 747-400 approached Hong Kong’s Kai Tak Airport in the early morning hours, the weather was clear with light winds. The runway in use, 31, was aligned with the prevailing conditions, and the aircraft was configured for a standard instrument approach. What followed was a sequence of events that tested the limits of the aircraft’s autopilot system and the crew’s manual flying abilities.
Technical Malfunction and Human Response
The critical moment occurred during the final approach when the autoland system, designed to guide the aircraft down the glide slope, began to deviate. Instead of maintaining the correct trajectory, the plane started to drift to the right. The captain attempted to correct the roll using the control yoke, but the aircraft’s response was sluggish. Investigators later determined that the primary issue stemmed from the autopilot being inadvertently left in a mode that allowed the aircraft to be manually overridden in a way that conflicted with the autoland logic. By the time the aircraft touched down, it was already significantly off-center, traveling at a high speed down the wet runway.
The Collision with the Sea Wall
With minimal braking effect, the jetliner veered off the end of the runway, plunging 200 feet into the waters of Victoria Harbour. The fuselage broke into two sections as it struck the sea wall, though the main structure remained largely intact. Emergency services responded rapidly, and within minutes, rescue boats were alongside the aircraft. The evacuation was conducted efficiently, with all individuals escaping within 10 minutes. While the aircraft was a total loss, the successful rescue operation was a testament to the preparedness of the Hong Kong authorities and the crew’s training during the pre-evacuation phase.
Investigation and Findings
The subsequent investigation by Hong Kong’s Civil Aviation Department was thorough and meticulous. The final report concluded that the captain’s decision to manually override the autoland system, while necessary due to the deviation, was the primary cause of the accident. Specifically, the captain’s control inputs inadvertently disabled the autoland functionality, leading to a sudden loss of directional control. The report also highlighted that the first officer, who was monitoring, did not effectively intervene or call out the deteriorating situation soon enough. Furthermore, the inquiry noted that the runway’s wet conditions, while not extreme, contributed to the reduced braking efficiency.
Impact on the Industry and China Airlines
For China Airlines, the incident was a severe reputational and financial blow. The airline was already navigating the complexities of operating in a politically sensitive region, and this accident intensified scrutiny. Fleet-wide inspections were ordered, and the airline faced criticism regarding its training protocols for handling automated systems. The aviation industry as a whole took note, with manufacturers and regulators revisiting the logic of autoland overrides and the clarity of warning systems. Boeing used the data from this incident to refine the user interface of subsequent 747 variants and other wide-body aircraft to prevent similar mode confusion.
