# NTSB ERA26LA231: Olson/Williams Sonex, N28YD, Jaffrey, NH, June 5, 2026

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Class 3 · Limited · Preliminary report
- Date: June 5, 2026, 11:00 local (15:00 UTC)
- Place: Jaffrey, NH · On Airport
- Coordinates: 42.819564, -72.05766 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.8196&lon=-72.0577&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Defining event: [Takeoff: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Investigation ongoing
- Investigation class: Class 3
- NTSB office: Eastern Region Aviation
- Parties: FAA/FSDO
- NTSB case key (mKey): 203133
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ERA26LA231
- NTSB preliminary report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/203133/pdf
- Page: https://openairdocs.org/ntsb/ERA26LA231

## Preliminary report

On June 5, 2026, at 1100 eastern daylight time, an experimental amateur-built Sonex airplane, N28YD, was substantially damaged when it was involved in an accident near Jaffrey, New Hampshire. The private pilot was seriously injured. The flight was conducted as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot, who was also the owner of the airplane said he planned to depart the Jaffrey Airfield Silver Ranch Airport (AFN), Jaffrey, New Hampshire, for a short flight in the local area. After he performed a pre-flight inspection of the airplane, which included checking the fuel for adequate quantity and for contamination, the pilot started the engine and back-taxied to the end of runway 34. Prior to departure, he performed an engine run-up, and everything was normal. During the subsequent takeoff when the airplane reached about 100 ft above the ground, the engine “unexpectedly stopped.” With no runway remaining to land, and buildings in front of him, he attempted to land in a field off to his left. The pilot had no further memory of the accident sequence. A witness, who watched the airplane depart, said that when the airplane reached about 100 ft above the ground, the engine made two “putt, putt, putt” sounds and went silent. He thought the engine started again but only momentarily. The airplane turned left and the witness thought the airplane was going to impact trees. He grabbed a fire extinguisher and responded to the field where the airplane crashed. The witness later observed the fuel selector in the “on” position and turned it off to prevent spillage or fire. The airplane came to rest upright in the opposite direction of travel, and there was no postimpact fire. The left wing and fuselage sustained substantial damage. The canopy was shattered and the engine was displaced aft and twisted in its mounts. The airplane wreckage was retained for further examination.

## Sequence of events

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

- [Takeoff: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) (defining event); cases with it: [Olson/Williams SONEX, 1 case](https://openairdocs.org/ntsb-events/341/sequence.md?model=059010N), [All aircraft, 3,820 cases](https://openairdocs.org/ntsb-events/341/sequence.md)

## Aircraft

- Registration: [N28YD](https://openairdocs.org/aircraft/N28YD), registered now, S/N 533, built 2007 (OpenAirDocs)
- Reported make and model: OLSON/WILLIAMS SONEX
- Registry model: [Olson/Williams SONEX](https://openairdocs.org/model/olson-williams-sonex) (registry code 059010N) (OpenAirDocs)
- Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs)
- Category: Airplane
- Serial number: 533
- Year built: 2007
- Airframe hours: 367
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Special, Experimental light sport (Special)
- Last inspection: Condition, October 22, 2025
- Airport: AFN, Jaffrey Airfield Silver Ranch, runway 16/34, 2,982 × 134 ft, asphalt
- Equipment: ADS-B

## Weather

- Conditions: Visual (VMC), Day
- Temperature: 80 °F
- Observed at: AFN, 0.25 nm away

## 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 20260605005239A](https://openairdocs.org/incident/20260605005239A), Jun 5, 2026: Olson/Williams SONEX, Jaffrey, NH, Substantial damage. On June 5, 2026 at approximately 1638Z the aircraft crashed shortly after takeoff due to a loss of power and possible stall. The pilot was injured and…

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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