Amateur-built KR-2 N9028Q accident near Cataldo, Idaho

Probable cause

The pilot’s decision to intentionally enter a spin in the airplane, which had unknown spin characteristics due to the engine modification, from which he was unable to recover.

NTSB analysis

The experimental/amateur built airplane was being operated by the pilot as a personal local flight. The airport manager reported that, in previous conversations, the pilot had told him that he was interested in practicing spins and other maneuvers in the airplane and that he had directed the pilot to a known practice area for the airport. Witnesses reported seeing the airplane spiraling toward the ground in the distance, and, although they did not see the impact, they were concerned, so a search for the airplane was initiated, and the wreckage was located in the area where the airport manager had directed the pilot.

A video-recording device found in the airplane contained a digital file that captured the accident flight from taxi to impact. The video showed the pilot initiating an intentional left spin. During the first few rotations, the engine quit, and the propeller stopped turning. After several additional rotations, the spin stabilized but the airplane continued its descent about 20-degrees nose down until impact. During the descent, the pilot was observed applying various control inputs without effect.

The airplane had been modified from the original design specifications and was equipped with a heavier engine than the engine recommended by the kit manufacturer. The kit manufacturer reported that, if the airplane was built to the manufacturer's specification and engine recommendation, the airplane had spin and recovery characteristics similar to low-wing airplanes. However, due to the modifications on the accident airplane, the spin characteristics were unknown. Regardless, the airplane had not been test flown for spins.

Text from the NTSB. Open the NTSB docket for WPR13FA380 for the full record.