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Atlas / NTSB / GAA18CA569

NTSB CAROL · Event

Event GAA18CA569

2018-09-15 Grass Valley, Oregon, United States None 1 aircraft Status: Completed

Aircraft involved

Probable cause & findings

The pilot’s failure to maintain directional control during the landing roll.

Factual narrative

The pilot of the tailwheel-equipped airplane reported that, during the second approach to the unimproved canyon airstrip in moderate turbulence he felt that the groundspeed was faster than normal and that he had a tailwind, but he reduced power to idle, and landed. About 300 ft into the ground roll, at 35 mph, the airplane veered left. He applied right rudder and moderate braking, but the airplane exited the airstrip to the left. The airplane's left main landing gear struck a pile of rocks that were painted white and used to mark the edge of the runway. The left main landing gear separated from the airplane. The airplane sustained substantial damage to the fuselage, left wing, and left aileron. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. An automated weather observation system about 16 nautical miles from the accident site reported that, about the time of the accident, the wind was from 290° at 13 knots, gusting to 16 knots. The pilot was landing to the south. The pilot of the tailwheel-equipped airplane reported that, during the second approach to the unimproved canyon airstrip in moderate turbulence, he felt that the groundspeed was faster than normal and that he there was a tailwind, but he reduced power to idle and landed the airplane. About 300 ft into the ground roll, at 35 mph, the airplane veered left. He applied right rudder and moderate braking, but the airplane exited the airstrip to the left, and its left main landing gear struck a pile of rocks that were painted white and used to mark the edge of the runway. The left main landing gear separated from the airplane. The airplane sustained substantial damage to the fuselage, left wing, and left aileron. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. An automated weather observation system about 16 nautical miles from the accident site reported that, about the time of the accident, the wind was from 290° at 13 knots, gusting to 16 knots. The pilot was landing to the south. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

Hierarchical cause / factor breakdown from the FAA bulk avdata database. Each finding tagged C (Cause) or F (Factor).

  • C Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Directional control-Not attained/maintained - C
  • C Personnel issues-Task performance-Use of equip/info-Aircraft control-Pilot - C
  • Environmental issues-Conditions/weather/phenomena-Wind-Tailwind-Effect on operation
  • Environmental issues-Conditions/weather/phenomena-Wind-Gusts-Effect on operation

Verbatim from NTSB's published report. Source file NTSB_2018_GAA18CA569.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

Related research

What the literature says.

Academic papers and agency reports matching this event's aircraft type or causal vocabulary (turbulence). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.

Browse the full corpus — academia portal ↗