Basehor, KS, USA
N6170
KNIGHT AA Nieuport 28
On the day of the accident, the pilot intended to fly the airplane for the first time since it had been repaired following a previous hard landing. The pilot, who was the builder of the experimental biplane, was taking off on a personal flight when the airplane veered to the left, lifted off the runway, and flew back toward the runway centerline. A witness noted that the airplane was going “very slow.” When the airplane reached an altitude of about 200 ft above ground level, the airplane started to make a slow left turn. The witness then observed the tail of the airplane drop down and the left wing roll, and the airplane subsequently spun to the ground. A postcrash fire ensued. About 2 years before the accident, the airplane was involved in a hard landing, which damaged the landing gear. The pilot subsequently repaired the landing gear, which would have included removal and reassembly of the wing struts. Postaccident examination of the airplane found that the left outer interplane strut was not correctly attached to the lower left wing compression strut. The bolt and nut were present through the outer interplane strut but had not been secured to the lower wing compression strut. The disconnected strut would have resulted in an out-of-rig condition and change the flight characteristics of the upper and lower left wings, potentially inducing drag while in flight. In this case, the upper and lower left wings would have each displayed different flight characteristics because the lower wing angle was pushed down and the upper wing was pushed up during the wire-tensioning process. The faster the airplane flew in the out-of-rig condition, the more pronounced the changed flight characteristics of the upper and lower left wings would have become. During the accident sequence, the pilot likely tried to slow the airplane to improve the changed flight characteristics, but the airplane’s critical angle of attack was exceeded and resulted in the airplane’s subsequent stall and spin to the ground.
On July 18, 2022, about 1000 central daylight time, an experimental amateur-built AA Nieuport 28, N6170, was destroyed when it was involved in an accident near Basehor, Kansas. The pilot was fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. According to a witness, he met the pilot about 0900 on the day of the accident and helped him perform the preflight inspection and pull the airplane from its hangar. The witness stated that there were no issues with the preflight inspection and that the 12 gallon fuel tank was full. The witness also stated that the pilot planned to climb straight out to an altitude of about 500 ft above ground level (agl) and then turn left and stay close to the runway while he checked the airplane. The pilot started the engine and let it warm up for about 10 minutes. The pilot then gave the witness a thumbs up and applied full throttle for the takeoff. During the takeoff roll, the airplane veered to the left, and the witness thought that the airplane was going to hit a large round hay bale next to the runway. The airplane lifted off the ground and cleared the hay bale by 6 ft. The pilot flew back toward the runway centerline but was going “very slow.” After clearing the treetops, the airplane started to make a slow left turn at an altitude of about 200 ft agl. The witness then observed the tail drop down and the left wing roll, and the airplane subsequently spun to the ground. A postcrash fire ensued. According to the witness, the pilot built the biplane from a kit in 2016 and equipped it with a Volkswagen engine. Between 2016 and the accident date, the pilot had operated the airplane about 30 hours. During that time, the airplane had several problems with the engine and oil leaks. In 2020, the pilot made a hard landing that fractured the main landing gear. During the next 2 years, the pilot repaired the landing gear, which would have included removing and reassembling the wing struts, and installed a Lycoming O-320 engine on the airframe. The work was completed in April 2022. The pilot performed several slow-speed taxies during the weeks that followed and, on the day of the accident, the pilot intended to fly the airplane for the first time since 2020. The current airplane’s maintenance logbooks and the pilot’s logbook were not located. The accident site was located in a field about 1,600 ft east of the runway. The airplane impacted the ground in a nose-down attitude. The wooden propeller blades were splintered into numerous pieces at the impact point. The main landing gear separated and the airplane slid about 60 ft before it came to rest upright on a 15° magnetic heading. The center portion of the wings and fuselage were almost completely consumed by fire. The engine was fractured at its mounts and was located under the left wing. The fabric was burnt except for a small piece on the tips of the upper and lower right wing. Flight control continuity was established from the control surfaces to the control stick, which was thermally destroyed. Examination of the engine revealed no preimpact mechanical anomalies that would have precluded normal operation. Examination of the airframe revealed the left outer interplane strut was not correctly attached to the left lower wing compression strut. The bolt and nut were present through the outer interplane strut, but the interplane strut had not been attached to the lower wing compression strut through the bolt mounting hole.
The pilot’s incorrect installation of the left-wing strut, which resulted in a loss of airplane control during takeoff and a subsequent aerodynamic stall and spin from which the pilot could not recover.
Source: NTSB Aviation Accident Database
Aviation Accidents App
In-Depth Access to Aviation Accident Reports
