Investigation Summary
The accident occurred when the crew was forced to switch from a straight-in ILS approach for runway 36L to a circling approach for runway 18R due to a tailwind. This maneuver required the pilots to fly downwind, then turn 180 degrees to align with the opposite runway while maintaining visual contact. The captain, who had never performed a circling approach at Gimhae, took over manual control from the first officer during the maneuver. Amidst rain and low visibility, the crew failed to start their stopwatch for the outbound leg, causing them to fly too far north. The captain became preoccupied with looking for the runway out of the side window and failed to monitor the aircraft's heading and altitude, leading to a Controlled Flight Into Terrain (CFIT).
Final Conclusions
The Korea Aviation Accident Investigation Board (KAIB) concluded the primary cause was the flight crew's failure to execute the circling approach according to standard procedures. Contributing factors included poor crew resource management (CRM), loss of situational awareness, and inadequate training for circling approaches in wide-body aircraft. The report also noted that the Gimhae tower controllers failed to use the Minimum Safe Altitude Warning (MSAW) system or provide timely assistance when the aircraft disappeared from view in the clouds.
Photographic Evidence (1)
Video Analysis
Air China Flight 129: The 2002 Mount Dotdae Crash — Analysis of the Boeing 767 crash near Busan, South Korea, caused by a loss of situational awareness during a circling approach in poor weather. The video details the crew's failure to track timing during the final turn.
Watch on YouTube ↗If playback is blocked, the owner has disabled embedding — use the link above.
Systems & Failure Modes
MSAW (Minimum Safe Altitude Warning)
A ground-based safety system that alerts controllers if an aircraft is flying too low; it was active but not utilized by the tower controller.
Tower BRITE
A high-brightness radar display in the tower that allows controllers to track aircraft positions; the controller failed to monitor the flight's progress on this screen.
GPWS (Ground Proximity Warning System)
The aircraft was equipped with an older GPWS rather than modern EGPWS. It operated as designed but failed to trigger a warning because the aircraft was in landing configuration and the terrain closure rate was insufficient for a Mode 2 alert.
Interesting Facts
- 01The captain was one of only 37 survivors of the crash.
- 02Air China had no fatal accidents in its history prior to this event.
- 03The visibility at the time of the accident was 3,200 meters, which was below the airline's required minima for a circling approach.
- 04The crew had only practiced circling approaches in a simulator for Beijing, never for the specific terrain at Gimhae.
- 05The aircraft was a Boeing 767-2J6ER in its 17th year of service with over 39,000 flight hours.
Safety Actions & Advisories
Circling Approach Training Reform
Air China revised its training syllabus to include simulator sessions for circling approaches at specific high-difficulty airports, including Gimhae.
ATC Procedure Standardization
South Korean aviation authorities improved training for controllers regarding the use of MSAW alerts and visual tracking of aircraft during circling maneuvers.
Known Controversies & Unanswered Questions
Dispute over ATC Responsibility
Reference ↗The Chinese CAAC formally disagreed with the KAIB report, arguing that the South Korean air traffic controller was unlicensed and provided misleading instructions that contributed to the crew's confusion.