Investigation Summary
The aircraft was cruising at approximately 8,900 meters (29,100 feet) when it deviated from its assigned altitude. Radar data showed a rapid loss of altitude and a significant increase in ground speed. Air traffic controllers attempted to contact the crew multiple times after noticing the deviation, but received no response. The aircraft impacted the ground in a heavily forested area at a high velocity, creating a deep impact crater and causing a localized forest fire. Preliminary investigations by the Civil Aviation Administration of China (CAAC) noted that the weather was suitable for flight, the crew was qualified, and the aircraft had no known mechanical issues prior to the dive. The flight data recorder (FDR) and cockpit voice recorder (CVR) were recovered in damaged condition and sent to Washington, D.C., for data extraction by the NTSB.
Final Conclusions
As of the second anniversary update in March 2024, the CAAC has not released a final determination of the cause. The investigation continues to focus on wreckage recovery, structural analysis, and flight data reconstruction. No evidence of explosives or hazardous materials has been found. The investigation is examining the possibility of intentional pilot action, though this has not been officially confirmed as the primary cause.
Video Analysis
No video analysis linked for this case file yet.
Systems & Failure Modes
Flight Control System
The mechanical and hydraulic systems that move the elevators, ailerons, and rudder.
Flight Data Recorder (FDR)
The 'black box' that records flight parameters; it was found buried 1.5 meters deep.
Cockpit Voice Recorder (CVR)
The 'black box' that records cockpit audio; it was found heavily damaged on March 23.
Interesting Facts
- 01The aircraft was a Boeing 737-800, which does not use the MCAS system found on the 737 MAX.
- 02The descent was nearly vertical, with the aircraft reaching speeds close to the speed of sound.
- 03No emergency code (squawk) or distress radio call was transmitted by the crew.
- 04The impact was so severe that most of the wreckage was buried deep underground.
- 05The aircraft was less than seven years old and had a clean maintenance record.
Safety Actions & Advisories
Industry-wide Safety Inspection
Following the crash, the CAAC ordered a two-week safety inspection of the entire Chinese aviation industry to identify and eliminate hidden risks.
Psychological Evaluations
China Eastern Airlines temporarily grounded its Boeing 737-800 fleet and implemented enhanced psychological screening and support for its flight crews.
Known Controversies & Unanswered Questions
Allegations of Intentional Action
Reference ↗In May 2022, reports citing U.S. officials suggested that flight data indicated someone in the cockpit intentionally crashed the plane. Chinese authorities have neither confirmed nor denied these reports, stating the investigation is ongoing.