N427LB

HISTORY OF FLIGHTOn May 3, 2020, at 1110 mountain daylight time, a Rans S-12 airplane, N427LB, was destroyed when it was involved in an accident near Delta, Colorado. The pilot sustained fatal injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 test flight.

A witness stated that he talked to the pilot about the airplane’s stability issues, and the pilot told him that he performed some high-speed taxi tests and was trying to adjust to correct the issues. The witness did not think the pilot was going to fly [on the day of the accident] and was only going to perform another set of high-speed taxi tests. The witness believed the pilot was caught off guard and the airplane became airborne.

A witness at Blake Field Airport (AJZ), Delta, Colorado, stated that he saw the airplane takeoff from runway 14, and it appeared to be under control.

The airplane flew along the left downwind leg for runway 21 about 300-400 ft above ground level, in straight, level, and stable flight. After the airplane passed the approach end of runway 32, it pitched down, banked sharply right, and the engine throttled back. The witness said it was hard to tell if the engine was throttled back before the sudden change in pitch or in its response to the change in pitch; a loss of control/stall occurred.

Another witness at AJZ stated that he heard an engine repetitively going from full engine power, then back off, and then return to full engine power. He said that when he saw the airplane, he thought the wings were rocking. The airplane banked to the right, was very low, and pitched "a lot." About 3–4 seconds later, the airplane impacted the ground.

AIRCRAFT INFORMATIONThe airplane owner stated the pilot was restoring the airplane since its purchase in June 2018. The owner said that he talked to the pilot on the day before the accident, and the pilot told him that he was close to having the airplane flyable. The owner asked the pilot to call him if he was going to fly the airplane so that he could watch the flight, but the pilot did not contact him.

Airplane records did not contain weight and balance information and such information was not received by the National Transportation Safety Board Investigator-in-Charge.

AIRPORT INFORMATIONThe airplane owner stated the pilot was restoring the airplane since its purchase in June 2018. The owner said that he talked to the pilot on the day before the accident, and the pilot told him that he was close to having the airplane flyable. The owner asked the pilot to call him if he was going to fly the airplane so that he could watch the flight, but the pilot did not contact him.

Airplane records did not contain weight and balance information and such information was not received by the National Transportation Safety Board Investigator-in-Charge.

WRECKAGE AND IMPACT INFORMATIONThe accident site was about 220 feet from the approach end of runway 32 in an upright position. The wings and empennage with attached control surfaces were intact with the fuselage. The wing flaps were retracted. The airplane wings and fuselage sustained structural damage to both wings and fuselage.

Postaccident examination of the airplane confirmed flight control continuity from the control surfaces to the cockpit flight controls. The horizontal stabilizer’s angle of incidence was positioned, attached, and secured to the lowest bolt hole along the leading-edge root of the vertical stabilizer.

Three bags containing shot (each weighing about 24.4 lbs, 25.2 lbs, and 25.2 lbs respectively) and a fourth shot bag that was ruptured and estimated to be about the same weight as the other three, were found in the passenger seat area. One of two dumbbell weights (marked 35 lbs) was also found in the passenger seat area. Recovery personnel recovered the other dumbbell weight from an unknown location in the airplane.