Investigation Summary
The investigation revealed a combination of operational negligence and technical limitations. The aircraft was approximately 2,300 kg (5,000 lbs) over its maximum landing weight of 80,000 kg. Furthermore, the transportation service at Krasnoyarsk had calculated the load using an outdated standard of 75 kg per adult passenger instead of the required 80 kg, leading to an inaccurate weight and balance manifest. During the final approach, the nose-heavy condition required significant upward elevator deflection to maintain the glide path. As the crew attempted to manage the descent, the aircraft entered a high vertical speed state. By the time the crew initiated a go-around maneuver 9 seconds before impact, the longitudinal control was insufficient to arrest the descent due to the extreme forward center of gravity and low airspeed (261–263 km/h).
Final Conclusions
The crash was caused by the aircraft being operated outside of its weight and balance envelopes, specifically an excessive landing weight and a center of gravity beyond the forward limit. This was facilitated by errors in passenger weight estimation by ground services. The resulting loss of longitudinal control effectiveness at low speeds prevented the crew from recovering the aircraft from a below-glide-path excursion during the final approach.
Video Analysis
No video analysis linked for this case file yet.
Systems & Failure Modes
Elevators
The primary flight control surfaces used for pitch; they lacked sufficient authority to counter the nose-heavy condition at low speeds.
Weight and Balance Calculation
The manual or automated system used to determine the aircraft's center of gravity, which was fed incorrect data at Krasnoyarsk.
Interesting Facts
- 01The aircraft was 2,300 kg (5,000 lbs) above its maximum landing weight of 80,000 kg.
- 02Ground services used a standard passenger weight of 75 kg instead of the mandated 80 kg.
- 03The center of gravity was determined to be between 16% and 18% MAC, which was beyond the safe forward limit.
- 0499 people were killed, including 4 crew members and 95 passengers.
- 05The aircraft struck a mound 470 meters short of the runway before sliding across the frozen terrain.
Safety Actions & Advisories
Standard Passenger Weight Revision
The investigation highlighted the danger of using inaccurate standard weights for passengers, reinforcing the requirement to use 80 kg per adult in weight and balance calculations.
Tu-154 Center of Gravity Limits
The accident led to stricter oversight of loading procedures for the Tu-154 to ensure the center of gravity remained within the mean aerodynamic chord (MAC) limits.