Investigation Summary
The accident occurred during the first year of the Tu-154's commercial service. As the aircraft passed the Liboc outer marker, it suddenly pitched down at an angle of 4.62 degrees. The crew attempted to recover by applying full power and pulling back on the control columns, but the elevators lacked sufficient authority to counteract the aerodynamic forces generated by the misconfigured stabilizer. The aircraft struck the ground 467 meters short of the runway; while some sources state the nose wheel struck first, others indicate the right wing made initial contact, triggering an immediate fire. The investigation highlighted significant CRM issues, as the cockpit was overcrowded with eight crew members, including multiple inspectors and a trainee radio operator with only two hours of experience on the Tu-154, which likely disrupted coordination during the critical landing phase.
Final Conclusions
The Soviet commission concluded that the primary cause was pilot error involving the improper manipulation of the stabilizer control switch. The switch design allowed the stabilizer to move from -5.5 degrees to 0 degrees without a clear tactile or visual warning to the crew. This change removed the nose-up pitching moment required for landing, causing the aircraft to dive. The presence of excess personnel in the cockpit was cited as a contributing factor that hindered effective communication and monitoring.
Video Analysis
No video analysis linked for this case file yet.
Airframe & Maintenance
Crew Experience
Captain
Sergei F. Chernetsov
Co-pilot
Vladimir P. Beresnev
Navigator
Vadim Ye. Yurchenko
Flight Engineer
Valery M. Shchegolev
Navigator (Inspector)
Lev B. Uspensky
Flight Engineer (Instructor)
Igor I. Motasov
Flight Radio Operator (Instructor)
Daniil I. Zyazin
Trainee Radio Operator
Andrei V. Zhukov (Trainee with only 2 hours on type despite high total time)
Systems & Failure Modes
Horizontal Stabilizer
A movable tail surface used to trim the aircraft; moving it to the 'flight' position during landing caused a fatal nose-down pitch.
Elevators
Primary flight controls on the tail; they lacked the surface area to overcome the pitch moment caused by the misaligned stabilizer.
Interesting Facts
- 01The aircraft was the first Tu-154 to be lost in a fatal accident.
- 02The cockpit was occupied by eight crew members, including a trainee and two inspectors, in violation of standard flight assignment regulations.
- 03The aircraft struck the ground 467 meters short of the runway threshold; reports vary on whether the nose wheel or right wing struck first.
- 04Of the 66 fatalities, 62 were passengers and 4 were cabin crew; all 8 cockpit crew members survived.
- 0534 people were initially evacuated from the wreckage, but many later succumbed to their injuries or the fire.
- 06Surviving passengers reported that the design of the seatbelt buckles hindered their escape.
Safety Actions & Advisories
Cockpit Discipline Enforcement
The Soviet Ministry of Civil Aviation reinforced regulations regarding the maximum number of personnel allowed in the cockpit to prevent coordination breakdowns.
Stabilizer Control Design Review
Investigators recommended improvements to the stabilizer switch design to prevent accidental activation and provide better feedback to the crew.
Known Controversies & Unanswered Questions
Discrepancy in Probable Cause
Reference ↗The Czechoslovak commission officially stated the cause was undetermined, citing possible wind shear or turbulence, whereas the Soviet commission explicitly blamed pilot error and stabilizer misconfiguration.