WPR21LA306 · Piper J3C-85
Twin Oaks Airpark Piper J3C-85 · Accident: collision during takeoff/landing
From Stark's Twin Oaks Airpark (7S3) to McMinnville, OR
Event
- NTSB case
- WPR21LA306
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- Event fatalities
- Unknown
- Ground fatalities
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Piper J3C-85
- Aircraft type
- Piper J3
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N6018H
- Operator
- Twin Oaks Airpark
- Onboard fatalities
- Unknown
- Route
- From Stark's Twin Oaks Airpark (7S3), Hillsboro, ORTo McMinnville, OR
- Aircraft age
- About 75 years (built 1946)
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Takeoff
- Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Collision during takeoff/landing
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- None
Cause areas
- Environmental issues › Physical environment
- Personnel issues › Psychological
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
The pilot of the tailwheel equipped airplane reported that, while taking off from a gravel bar, as the airplane became airborne over the river, he felt a bump. The passenger reported that they hit something, however the pilot stated that he never say anyone until he continued the climbed and circled over the area, where he noticed a kayaker on the river. He elected to land on a gravel bar near the kayaker, render first aid, and call for medical assistance.
The kayaker reported that, while on the Willamette River, she and her mother stopped and rested near the Lower Lamber Bar area, where they observed an airplane on one of the sand bars. After resting, they continued traveling down the river. While paddling in the kayak, she turned towards the sand bar and observed the airplane approaching her. Shortly thereafter, the front tire of the airplane hit her head and overturned the kayak. The kayaker sustained a serious broken leg. The airplane was not damaged. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.
Probable cause
The pilot’s failure to maintain clearance during takeoff from a person on the ground who sustained a serious injury as a result of the collision.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record WPR21LA306
- Event ID
- 20210806103649
- Case number
- WPR21LA306
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: local date, investigation status, coordinates, cause areas, damage. Values present in the bulk record are kept.
- The date is the local date; the NTSB stores the UTC date 2021-08-05.
- API snapshot SHA-256: 1f3b9bd6388ba88f615bf5c4e3ea674233ed1a64bc9f9957cdd8a3504c5ecb93; retrieved 2026-09-16T14:23:05.990Z.