Amateur-built SH 3R N333AW accident near Columbus, Georgia

Probable cause

The mechanic’s improper installation of the landing gear extend/retract switch, which resulted in the retraction of the landing gear during the aborted takeoff.

NTSB analysis

The pilot was returning the airplane to his home base following an avionics installation. During the takeoff roll, about 80 knots, the canopy handle vibrated to the open position, and the canopy opened. As the pilot was rejecting the takeoff, the landing gear retracted. The pilot was unable to maintain directional control, and the airplane departed the runway; the left wing struck a taxiway sign, resulting in structural damage. Examination of the aircraft after the accident revealed that the landing gear extend/retract switch was installed upside-down in the newly-replaced instrument panel. The switch was in the "retract" position during preflight and takeoff; however, the safety squat switch on the landing gear prevented gear retraction while on the ground. Once weight was removed from the landing gear during the takeoff sequence, the switch commanded the landing gear to retract. The mechanic who installed the instrument panel did not perform a functional gear check (gear swing) prior to releasing the airplane to the owner.

Text from the NTSB. Open the NTSB docket for ERA14LA422 for the full record.