28 fatalities

1971-12-21: Ilyushin II-18 (LZ-BES) — Balkan Bulgarian Airlines — Sofia-Vrazhdebna, Bulgaria

Sofia-Vrazhdebna, BulgariaTakeoff (climb)

On December 21, 1971, an Ilyushin II-18 (registration LZ-BES) operated by Balkan Bulgarian Airlines was involved in an aviation accident near Sofia-Vrazhdebna, Bulgaria during takeoff. 28 people were killed. Investigators recorded the probable cause as: For unknown reason, technicians failed to comply with maintenance procedure and it was determined that the aileron control cables were not properly connected. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 8 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 1781234555Data APIEditorial standards

Shortly after night takeoff, an airplane banked left at 8 meters altitude, struck the runway with its left wing, and crashed in flames. 28 people, including two crew and a singer, were killed; 45 injured. Investigators found aileron control cables improperly connected due to maintenance procedure noncompliance.

Accident Summary

Just after liftoff during a night climb to an altitude of 8 meters, the airplane banked sharply to the left. The left wing struck the runway surface, causing the aircraft to become uncontrollable. It crashed in flames in a grassy area on the left side of the runway. Debris was scattered over a distance of 400 meters.

Casualties and Evacuation

Emergency responders evacuated 45 injured individuals from the wreckage. Twenty-eight people were killed, including two crew members and Bulgarian singer Pacha Hristova, who was traveling to Algeria with members of the Bulgarian folkloric band 'Aura'.

Investigation Findings

Investigators determined that the airplane had just returned to service following ground maintenance. For reasons unknown, technicians failed to comply with maintenance procedures. Specifically, the aileron control cables were found to have not been properly connected. The probable cause of the accident was attributed to this maintenance error.