Aircraft Stall During Takeoff Roll Results in Belly Landing and Serious Injuries (RA-76834)

Incident Overview and Flight Dynamics During the takeoff roll, the copilot initiated rotation at a speed of 290 km/h. The aircraft lifted off and reached a height of 7 meters before entering a left bank of 3.5 degrees. After traveling a course of 665 meters, the aircraft entered a critical angle of attack, nosed up to 35 degrees, and landed back on the runway just as the undercarriage had been retracted. The aircraft slid on its belly and came to rest 270 meters further, approximately 120 meters to the left of the runway centerline. All 25 occupants were rescued, with two sustaining serious injuries. The aircraft was damaged beyond repair. ## Official Findings and Contributing Factors The official investigation determined that the captain decided to sit in the right front seat, allowing the copilot, who was seated in the left front seat, to take command. This arrangement was against published procedures because the copilot was not authorized and did not have sufficient experience. The copilot forgot to extend the flaps to the appropriate angle for the takeoff procedure, which caused the aircraft to adopt a critical angle of attack after liftoff and stall. Successive errors and poor crew coordination were considered contributing factors, as was the crew's failure to follow the pre-takeoff checklist and identify that the aircraft was not properly configured for the takeoff procedure.