Incident Overview
During descent to Bishkek, the aircraft experienced a failure of the hydraulic systems at an altitude of 5,700 meters. The crew continued the approach, and the captain informed air traffic control (ATC) that the landing gear could not be lowered. The crew subsequently performed a belly landing on a grassy area parallel to the main runway at Bishkek Airport. The aircraft slid for a certain distance before coming to rest.
Occupant and Aircraft Status
All 43 occupants on board were uninjured. However, the aircraft sustained structural damage and was considered damaged beyond repair.
Probable Cause
The official investigation determined the probable cause to be a failure of the main hydraulic system due to the loss of the cap of the hydraulic tank, caused by the destruction of the nut due to fatigue from structural and manufacturing faults.