At 14:35 Curtiss C-46 CP-541 was boarded. The takeoff had to be postponed due to some problems and associated repair of the propeller governor of no. 2 engine. A preflight engine test was carried out, which was satisfactory. After rolling 190 m during takeoff the plane veered left and then gradually to the right where it rang along the edge. The right wing tip was well outside the boundary of the 26,5 m wide runway. The right main gear went off the runway and into a drainage. At the 496 m point of the takeoff run the right wingtip struck an adobe wall and was detached from the wing. The takeoff run was continued and at the 580 m point the plane became airborne. The no. 2 engine propeller then cut a tree (6in in diameter) located at the 707 m point. The Curtiss continued to be airborne with a right bank increasing to between 65 and 70 degrees. The right wing then struck some trees 15 m in height resulting in the aircraft crashing nose down into the ground. PROBABLE CAUSE: “Pilot error in failing to discontinue takeoff, even after the right wing tip hit the well and broke off, while the aircraft was on the ground during the takeoff run.”