# NTSB CEN25LA279: Dyke Delta JD-2, N71AW, Oshkosh, WI, July 22, 2025

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: July 22, 2025, 14:32 local (19:32 UTC)
- Place: Oshkosh, WI
- Coordinates: 43.975447, -88.556805
- Nearby events: https://openairdocs.org/map.md?lat=43.9754&lon=-88.5568&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing-flare/touchdown: Loss of control in flight](https://openairdocs.org/ntsb-events/240)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report October 2, 2025
- Report: Approved by Office Director
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Central Region
- Parties: FAA FSDO
- NTSB case key (mKey): 200612
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN25LA279
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/200612/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=200612
- Page: https://openairdocs.org/ntsb/CEN25LA279

## Probable cause

The pilot’s failure to maintain control of the airplane while landing with a tailwind.

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Performance/control parameters: landing flare](https://openairdocs.org/ntsb-findings/01062041): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [White DYKE DELTA JD-2, 1 case](https://openairdocs.org/ntsb-findings/01062041/cases.md?model=0566509), [All aircraft, 1,285 cases](https://openairdocs.org/ntsb-findings/01062041/cases.md)
- [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [White DYKE DELTA JD-2, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=0566509), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md)

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Landing-flare/touchdown: Loss of control in flight](https://openairdocs.org/ntsb-events/240) (defining event); cases with it: [White DYKE DELTA JD-2, 1 case](https://openairdocs.org/ntsb-events/240/sequence.md?model=0566509), [All aircraft, 5,002 cases](https://openairdocs.org/ntsb-events/240/sequence.md)

## Analysis

The pilot was flying in the Homebuilt Showcase during the EAA AirVenture air show. The pilot reported that while landing with a variable tailwind the airplane touched down about 2,500 ft down the runway, bounced, and landed hard. The pilot applied brakes, and the right main tire began to squeal. The airplane departed the landing surface to the left. The right main landing gear collapsed, the nose landing gear separated. The airplane sustained substantial damage to the engine mounts and the right wing. The pilot reported that there were no mechanical malfunctions or failures that would have precluded normal operations.

## Aircraft

- Registration: [N71AW](https://openairdocs.org/aircraft/N71AW), registered now, S/N 1123, built 2010 (OpenAirDocs)
- Reported make and model: Dyke Delta JD-2
- Registry model: [White DYKE DELTA JD-2](https://openairdocs.org/model/white-dyke-delta-jd-2) (registry code 0566509) (OpenAirDocs)
- Registry engine: [Lycoming O-360-F1A6](https://openairdocs.org/engine/lycoming-o-360-f1a6) (registry code 42291, reciprocating) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 1123
- Year built: 2010
- Airframe hours: 589.7
- Engines: LYCOMING O-360-41A6 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Air race/show, Part 91
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Condition, October 8, 2024
- Airport: KOSH, Wittman, runway 36R, 8,000 × 75 ft, asphalt
- Equipment: ADS-B

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 76; injuries: none; private; airplane ratings: single-engine land; medical: basicmed, without waivers/limitations; last flight review June 6, 2025; seat: front; restraint: 4-point; flight hours: 1,789 total, 593 in this make and model, 1,721 as pilot in command, 12 in the last 90 days, 6 in the last 30 days, 0.2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 150° at 10 knots
- Visibility: 10 statute miles
- Temperature: 28 °F, dew point 21 °F
- Altimeter: 30.05 inHg
- Observed at: KOSH
- METAR: KOSH 221853Z 15010KT 10SM SCT029 28/21 A3005

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 20250722015809A](https://openairdocs.org/incident/20250722015809A), Jul 22, 2025: White DYKE DELTA JD-2, Oshkosh, WI, Substantial damage. On 07-22-2025, at 1430 CST, an experimental dyke delta JD-2 aircraft [privacy data omitted] landed at (osh) Oshkosh, Wisconsin during the eaa airshow and lost…

## Docket (3 files)

The files NTSB released with the investigation on October 2, 2025, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=200612. 4.9 MB in all.

- Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 10 pages, 3.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19127975&FileExtension=pdf&FileName=6120_1_Form-Rel.pdf
- Pilot statement provided to FAA (item 2, PDF, 2 pages, 63 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19264548&FileExtension=pdf&FileName=N71AW%20Pilot%20Narrative%20Provided%20to%20the%20FAA-Rel.pdf
- Photos (item 3, PDF, 4 pages, 1.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19259374&FileExtension=pdf&FileName=Accident%20Report%20Photographs-Rel.pdf

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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