Investigation Summary
Flight 409 departed Beirut at night into a storm with active cumulonimbus clouds. Shortly after takeoff, Air Traffic Control (ATC) changed the departure clearance to an immediate right turn. The crew struggled to maintain the assigned headings and altitudes, resulting in erratic flight maneuvers. The aircraft's stick shaker activated twice as the plane reached high angles of attack, indicating an impending stall. During these events, the captain provided inconsistent and often contradictory flight control inputs. Crucially, the crew failed to use the electric trim to relieve the heavy control column forces, which significantly increased the physical workload and contributed to exhaustion. The investigation highlighted that the captain had flown 188 hours in the 51 days preceding the accident, suggesting chronic fatigue. Despite numerous aural bank angle warnings and two stall sequences, the first officer did not take control or effectively challenge the captain's actions. The flight ended in a high-speed spiral dive with a bank angle reaching 118 degrees and a maximum speed of 407.5 knots before impacting the sea.
Final Conclusions
The Lebanese Ministry of Public Works and Transport concluded in its final report (January 2012) that the probable causes were the flight crew's mismanagement of speed, altitude, headings, and attitude through inconsistent inputs, and their failure to abide by CRM principles. The report also cited subtle incapacitation and spatial disorientation as likely factors, exacerbated by the captain's fatigue and the challenging weather conditions.
Photographic Evidence (1)
Video Analysis
Did a Dangerous Turn Cause this Plane to Crash? Air ... — Analysis of Ethiopian Airlines Flight 409, where the captain struggled to correct a steep turn and maintain control during a stormy departure from Beirut.
If playback is blocked, the owner has disabled embedding — use the link above.
Airframe & Maintenance
Crew Experience
Captain
44 years old, with the airline since 1989.
First Officer
23 years old, with the airline for one year.
Systems & Failure Modes
Stick Shaker
A mechanical device that rapidly and noisily vibrates the control yoke to warn the crew of an impending aerodynamic stall; it activated twice during the flight.
Flight Data Recorder (FDR)
Recovered from the seabed at a depth of 45 meters, providing critical data on the aircraft's erratic flight path and control inputs.
Crew Resource Management (CRM)
The system of communication and cooperation in the cockpit; the investigation found a total breakdown in CRM as the first officer failed to intervene.
Interesting Facts
- 01The aircraft was 8 years old and had undergone a maintenance check one month prior to the crash.
- 02The aircraft was previously operated by Ryanair as EI-CSW before being leased to Ethiopian Airlines in September 2009.
- 03The captain had over 10,000 total flight hours, while the first officer had only 673 total hours.
- 04The flight recorders and radar data stopped at approximately 1,300 feet while the aircraft was in its final high-speed dive.
- 05The aircraft reached a maximum speed of 407.5 knots and a G-load of 4.412 during the dive.
- 06Weather at the time included thunderstorms and cumulonimbus clouds at 2,000 feet.
- 07The investigation cited a heavy meal consumed by the crew prior to takeoff as a factor that may have negatively affected their quality of sleep and subsequent alertness.
Safety Actions & Advisories
CRM Training Review
The investigation emphasized the need for improved Crew Resource Management training, specifically regarding the first officer's duty to intervene during pilot incapacitation or erratic maneuvers.
Known Controversies & Unanswered Questions
Ethiopian Airlines Refutation
Reference ↗Ethiopian Airlines strongly disputed the final report, claiming it was biased and ignored evidence of an in-flight explosion. They cited eyewitness reports of a fireball and the sudden cessation of flight recordings as evidence of sabotage or a lightning strike.
Location
APPROXIMATE POSITION · AIRPORT LEVEL · Coordinates are the estimate published in the entered by an editor. The ring shows the accuracy the record supports, not the point of impact.