Narrative:
Aeroflot flight 8641 departed Leningrad-Pulkovo Airport at 09:01 local time. Destination of the flight was Kiev-Borispol Airport.
Cruising altitude was 9000 m.
The aircraft lost control and crashed from an altitude of FL300 following the failure of the horizontal stabilizer jackscrew due to fatigue. The crew completed pre-landing briefing and checks at 10:48. The flight was then cleared to descend to 7800 m. The crew confirmed this clearance. The descent was initiated and the horizontal stabilizer was trimmed nose down. It moved to +0.3° until it suddenly instantaneously moved beyond the mechanical stop (+2°). The aircraft pitched nose down and the flight crew were not able to regain control. An overload on the aircraft structure caused it to break up at an altitude of 5700 m.
Conclusion: the cause of the disaster is a sharp spontaneous transfer of the stabilizer to a dive due to the disconnection of the screw pair of the stabilizer shift mechanism due to the almost complete wear of the nut thread. This led to acceleration and subsequent destruction of the aircraft in the air from the action of off-design aerodynamic loads.
Loss of control
» airdisaster.ru
| Status: | |
| Date: | Monday 28 June 1982 |
| Time: | 10:51 |
| Type: |  Yakovlev Yak-42 |
| Operator: | Aeroflot, Leningrad Civil Aviation Directorate |
| Registration: | CCCP-42529 |
| MSN: | 11040104 |
| First flight: | 1981 |
| Total airframe hrs: | 795 |
| Cycles: | 496 |
| Engines: | 3 Lotarev D-36 |
| Crew: | Fatalities: 8 / Occupants: 8 |
| Passengers: | Fatalities: 124 / Occupants: 124 |
| Total: | Fatalities: 132 / Occupants: 132 |
| Aircraft damage: | Destroyed |
| Aircraft fate: | Written off (damaged beyond repair) |
| Location: | near Verbovichi, Narowla District ( Belarus)
|
| Phase: | En route (ENR) |
| Nature: | Domestic Scheduled Passenger |
| Departure airport: | Leningrad-Pulkovo Airport (LED/ULLI), Russia |
| Kiev-Borispol Airport (KBP/UKBB), Ukraine | |
| Flightnumber: | 8641 |
Aeroflot flight 8641 departed Leningrad-Pulkovo Airport at 09:01 local time. Destination of the flight was Kiev-Borispol Airport.
Cruising altitude was 9000 m.
The aircraft lost control and crashed from an altitude of FL300 following the failure of the horizontal stabilizer jackscrew due to fatigue. The crew completed pre-landing briefing and checks at 10:48. The flight was then cleared to descend to 7800 m. The crew confirmed this clearance. The descent was initiated and the horizontal stabilizer was trimmed nose down. It moved to +0.3° until it suddenly instantaneously moved beyond the mechanical stop (+2°). The aircraft pitched nose down and the flight crew were not able to regain control. An overload on the aircraft structure caused it to break up at an altitude of 5700 m.
Probable Cause:
Conclusion: the cause of the disaster is a sharp spontaneous transfer of the stabilizer to a dive due to the disconnection of the screw pair of the stabilizer shift mechanism due to the almost complete wear of the nut thread. This led to acceleration and subsequent destruction of the aircraft in the air from the action of off-design aerodynamic loads.
Classification:
Horizontal stabilizer Loss of control
Sources:
» Soviet Transports» airdisaster.ru
Follow-up / safety actions
All Yakovlev 42 aircraft were grounded following this accident. Major changes were made on the design of the aircraft until they were able to fly again late 1984.
Photos
Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Leningrad-Pulkovo Airport to Kiev-Borispol Airport as the crow flies is 1044 km (653 miles).
Accident location: Exact; as reported in the official accident report.
Distance from Leningrad-Pulkovo Airport to Kiev-Borispol Airport as the crow flies is 1044 km (653 miles).
Accident location: Exact; as reported in the official accident report.
This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2023 Flight Safety Foundation