What happened
On August 24, 2025, at approximately 19:26 CDT, a RANS S-12 Airaile, registration N2757A, was involved in a fatal accident near Concordia, Kansas. The aircraft was being operated under 14 CFR Part 91 for personal use.
A witness observed the airplane struggling to gain altitude, noting that it was alternating between slight climbs and descents while flying east. The aircraft then turned south and entered a nose-down spiral descent toward the ground. Video footage captured by a witness showed the engine operating as the aircraft entered a progressively steeper left turn toward the east. As the bank angle increased, the aircraft entered a steep nose-down pitch. Following the entry into the steep spiral, there was an abrupt reduction in engine noise at a low altitude.
The aircraft sustained substantial damage during the impact. The wreckage was located at the edge of a soybean field and a residential backyard, resting beneath power lines that were not damaged. The fuselage and both wings showed significant impact-related damage, and the forward portion of the fuselage and nose cone fragmented upon hitting the terrain.
The investigation
Investigators examined the airframe and found that all major structural components and flight controls were present at the site. While the instrument panel was fractured and several instruments were separated, the empennage, vertical stabilizer, horizontal stabilizer, elevator, rudder, and trim tab remained attached and intact. The ailerons and flaps also remained attached to their respective hinge points.
Post-accident examination of the flight control systems revealed no evidence of component failure. Continuity was confirmed for the rudder control cables, elevator push/pull tube, aileron cables, and flap cables. The wing flaps were found in the fully retracted position.
The fuel tanks, each with a 5-gallon capacity, contained ample fuel. The fuel was a light blue color consistent with a 2-cycle engine oil premix and was consistent with auto-fuel. No contamination was found in the fuel bowls or screens.
The engine remained attached to its mounts, and no leaks of coolant, fuel, or oil were observed on exterior components. Examination of the carburetors showed no mechanical failure. Internal engine testing confirmed that the crankshaft rotated freely, the electric starter functioned, and cylinder compression and suction were present. While the cylinder head showed foreign object debris damage on the power-takeoff side, this was consistent with a previous piston failure event and did not affect current operation. The propeller blades fractured during the impact, with fragments found at distances of 24, 81, and 86 feet from the main wreckage.
No evidence of a preimpact mechanical malfunction or failure that would have prevented normal operation was found.