A Learjet 35A, LV-BPA, crashed on takeoff from R¡o Grande Airport, Argentina, resulting in the deaths of both pilots and two medical personnel. The aircraft departed San Fernando Airport, BA (FDO) in the morning, bound for Comodoro Rivadavia Airport, CB (CRD) and R¡o Grande Airport, TF (RGA). The accident occurred during a return flight to base, and video footage reveals the aircraft rolling left and descending before impact. A critical issue was discovered: the male side of the aileron interconnecting cable tensioner was completely unscrewed, suggesting a disconnection in the yaw control between the pilot’s and copilot’s side control wheels. This disconnection could lead to a left-hand pilot’s control wheel only commanding a right turn and a right-hand pilot’s control wheel only commanding a left turn. The possibility of a gradual loosening of the tensioner over time due to missing locking clips during maintenance is being investigated.A Learjet 35A, LV-BPA, crashed on takeoff from R¡o Grande Airport, Argentina, resulting in the deaths of both pilots and two medical personnel. The aircraft departed San Fernando Airport, BA (FDO) in the morning, bound for Comodoro Rivadavia Airport, CB (CRD) and R¡o Grande Airport, TF (RGA). The accident occurred during a return flight to base, and video footage reveals the aircraft rolling left and descending before impact. A critical issue was discovered: the male side of the aileron interconnecting cable tensioner was completely unscrewed, suggesting a disconnection in the yaw control between the pilot’s and copilot’s side control wheels. This disconnection could lead to a left-hand pilot’s control wheel only commanding a right turn and a right-hand pilot’s control wheel only commanding a left turn. The possibility of a gradual loosening of the tensioner over time due to missing locking clips during maintenance is being investigated.