Amateur-built KR-2 N4GJ accident near Roseburg, Oregon

Probable cause

A loss of engine power due to the pilot's modification of the induction system, and the pilot's failure to maintain an adequate airspeed while maneuvering to a landing area following the power loss.

NTSB analysis

The pilot reported that shortly after departure, the engine experienced a partial loss of power about 200 feet above ground level (agl) during the initial climb. The pilot initiated a 180 degree turn to return to the runway; however, during the turn there was not sufficient altitude or airspeed to complete the turn. The airplane stalled/mushed and collided with a road near the airport. The forward section of the fuselage was structurally damaged as well as the wings. Post-accident inspection of the engine revealed that the pilot had just installed a new air intake. The pilot stated, "the intake after liftoff proved to be very efficient, so much so that it leaned the fuel mixture." The pilot reported no mechanical failures with the engine.

Text from the NTSB. Open the NTSB docket for SEA08LA140 for the full record.