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Atlas / NTSB / WPR21LA276

NTSB CAROL · Event

Event WPR21LA276

2021-07-08 Hillsboro, Oregon, United States Airport · HIO None 1 aircraft Status: Completed

Aircraft involved

Probable cause & findings

The second pilot’s diverted attention while taxing which, resulted in his failure to maintain clearance from another airplane holding short of the runway.

Factual narrative

The group of 6 airplanes were practicing formation flight for an airshow the following day. The airplanes were to takeoff in three groups of 2-airplane elements. The pilot in the lead airplane in the first group reported that, during taxi to the runway, he had come to a stop at the hold short line. The pilot who was in the second airplane, which was taxing behind the lead airplane, became distracted with the radios before looking up and seeing that the lead airplane had stopped. The pilot applied excessive braking; however, the tailwheel lifted off the ground. To prevent the propeller from ground impact, he released the brakes and the airplane collided with the lead airplane’s empennage. The lead airplane’s rudder and elevator were substantially damaged. The second airplane received minor damage. Neither pilot reported that there were any mechanical failures or malfunctions with either airplane 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).

  • Environmental issues-Physical environment-Object/animal/substance-Aircraft-Contributed to outcome
  • Personnel issues-Psychological-Attention/monitoring-Monitoring other aircraft-Pilot of other aircraft
  • Personnel issues-Psychological-Attention/monitoring-Monitoring other aircraft-Pilot
  • Environmental issues-Physical environment-Object/animal/substance-Aircraft-Contributed to outcome

Verbatim from NTSB's published report. Source file NTSB_2021_WPR21LA276.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 (icing). 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 ↗