Amateur-built CARBON CUB N257ST accident near Ogallala, Nebraska

Probable cause

The improper installation of the elevator control cable hardware, which resulted in the separation of the elevator control cable and a loss of pitch control in flight.

NTSB analysis

The pilot reported that he performed a flight control check before departing in his experimental, amateur-built airplane, and that the flight controls operated normally. During the initial climb, about 30 to 50 ft above ground level, the elevator control went slack. He could not regain elevator control and adjusted engine power in an attempt to regain control of the airplane’s pitch; however, the airplane descended and impacted the runway surface. The airplane skidded off the runway, the pilot egressed, and the airplane was destroyed by postimpact fire.

A postaccident examination of the airplane found that the top elevator control cable was not attached to the elevator horn. The securing bolt, nut, and cotter pin were not located. The lower elevator control cable remained attached via its bolt, but the securing nut and cotter pin were not located. A review of maintenance information about the airplane revealed that the airplane was originally assembled about three years before the accident, and had undergone several condition inspections, including one by a mechanic who was different than the owner/builder. The most recent condition inspection was performed by the owner/builder about nine months before the accident, and would have included inspection of all flight control surfaces. There was no logbook record of any recent maintenance to the elevator, nor did the pilot recall any. Based on the available information, it is likely that the elevator control cable was improperly secured during maintenance; however, when the maintenance occurred could not be determined.

Text from the NTSB. Open the NTSB docket for CEN25LA029 for the full record.