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Atlas / NTSB / WPR15CA173

NTSB CAROL · Event

Event WPR15CA173

2015-05-31 Ismay, Montana, United States Airport · PVT None 1 aircraft Status: Completed

Aircraft involved

Probable cause & findings

The pilot's incorrect action to continue the takeoff when he failed to maintain directional control during the takeoff roll.

Factual narrative

The pilot reported that he had successfully flown five aerial application flights prior to the accident flight with loads that were only half of capacity. This make/model airplane was new to the pilot, but he felt comfortable with the airplane having accumulated about 15 hours at the time of the accident. During the takeoff roll, the airplane hit a bump about halfway down the runway, and started to porpoise. The pilot stated that he started losing directional control, and applied the brakes. After regaining control, the airplane was not aligned with the runway; however, he continued the takeoff, thinking that the airplane was going to fly. The airplane subsequently departed the runway surface, collided with a three-strand wire fence, and bounced across a dike. The collision with the fence damaged the landing gear, and the airplane skidded to a stop. Both wings, both main landing gear, and the engine mount sustained substantial damage. The pilot reported no mechanical malfunctions or failures with the airplane or engine that would have precluded normal operation. The pilot reported that he had successfully flown five aerial application flights prior to the accident flight with loads that were only half of capacity. This make/model airplane was new to the pilot, but he felt comfortable with the airplane having accumulated about 15 hours at the time of the accident. During the takeoff roll, the airplane hit a bump about halfway down the runway, and started to porpoise. The pilot stated that he started losing directional control, and applied the brakes. After regaining control, the airplane was not aligned with the runway; however, he continued the takeoff, thinking that the airplane was going to fly. The airplane subsequently departed the runway surface, collided with a three-strand wire fence, and bounced across a dike. The collision with the fence damaged the landing gear, and the airplane skidded to a stop. Both wings, both main landing gear, and the engine mount sustained substantial damage. The pilot reported no mechanical malfunctions or failures with the airplane or engine that would have precluded normal operation.               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
  • C Personnel issues-Action/decision-Action-Incorrect action performance-Pilot - C
  • Personnel issues-Experience/knowledge-Experience/qualifications-Total experience w/ equipment-Pilot
  • Environmental issues-Physical environment-Object/animal/substance-Fence/fence post-Not specified

Verbatim from NTSB's published report. Source file NTSB_2015_WPR15CA173.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.