Piper PA 12 N3937M accident near Nulato, Alaska

Probable cause

The pilot’s improper landing flare, which resulted in a hard landing on upsloping terrain, and his subsequent failure to maintain adequate airspeed and his exceedance of the airplane’s critical angle of attack during an attempted go-around, which resulted in an aerodynamic stall.

NTSB analysis

The pilot reported that, while landing off airport on an upsloping ridge, the tailwheel-equipped airplane "touched down harder than preferred." He applied full throttle, initiated a go-around, and attempted to turn toward the down-sloping side of the hill. The airplane briefly became airborne, but it then aerodynamically stalled and nosed down into the tundra.

The airplane sustained substantial damage to the engine mount.

The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Text from the NTSB. Open the NTSB docket for GAA18CA320 for the full record.