Amateur-built Sonex-A accident near Martinsburg, West Virginia, April 4, 2026
On April 4, 2026 at about 5:39 pm local time, a 2006 amateur-built Sonex-A, registered N106D, was substantially damaged in an accident during enroute near Martinsburg, West Virginia (Eastern Wv Rgnl/Shepherd Fld airport). It was a personal flight under general aviation rules (Part 91). No one was hurt; 2 people were on board or involved. The weather was visual conditions (good weather).
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The NTSB's probable cause their words, unchanged
The NTSB has not yet published a probable cause for this accident. Investigations usually take one to two years; this page updates when the final report is released.
Source: NTSB aviation accident database, copy made October 4, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- April 4, 2026 · about 5:39 pm local time
- Place
- Martinsburg, West Virginia · Eastern Wv Rgnl/Shepherd Fld · map
- Type
- Accident
- Injuries
- No one was hurt; 2 people were on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Amateur-built Sonex-A, built 2006
- Registration
- N106D · registry record · serial 0899
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative preliminary · quoted from the NTSB record
On April 4, 2026, about 1339 eastern daylight time, a Girardeau Samuel G Sonex-A airplane, N106D, was substantially damaged when it was involved in an accident near Martinsburg, WV. The pilot and passenger were not injured. The aircraft was operated as a Title 14 Code of Federal Regulations (CFR) Part 91 personal flight. The pilot reported that 7 to 8 minutes after takeoff from Eastern WV Regional Airport (MRB), the engine exhaust gas temperatures (EGT) began to rise, while operating with a full rich mixture. When the EGTs continued to increase, he elected to return to the airport. Shortly thereafter, while returning to the airport, at about 2,500 ft altitude, the engine began to sputter and experienced a partial loss of power. The pilot declared an emergency with air traffic control. Unable to reach the airport, he conducted an emergency landing to an open field. After touchdown, he was unable to stop the airplane and subsequently impacted a fence and crossed a road before coming to rest against another fence. A metal fence post pierced the fuselage which resulted in substantial damage to the fuselage. The wreckage was retained for further examination.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
What happened, in order
- Loss of engine power (partial) during enroute defining event
The aircraft
- Airframe total time: 188.1 hours
- Last inspection: condition inspection, August 23, 2025
- Maximum gross weight: 1,150 lb
- Seats: 2
- Landing gear: fixed
The flight
- Departed from: MRB Martinsburg WV at 5:30 pm
- Destination: VG18 Bayse VA
Weather at the time
- Light: daylight
- Wind: at 5 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 81°F (27°C), dew point 59°F (15°C)
- Altimeter: 30.10 inHg
- Observation at 12:35 pm from KMRB, 2 miles away
Weather report (METAR): METAR KMRB 041553Z 10SM CLR 27/15 A3010
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight crew | 1 | |||
| Passengers | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The NTSB has not released the docket for this case yet. The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), is usually released when the investigation is nearly complete, and the list here is refreshed when it appears. Check at the NTSB.
About this page
Everything above comes from the NTSB's public accident database: the narrative, probable cause and findings are the NTSB's own words, and the coded tables behind its report (pilot, aircraft, flight, weather, injuries, sequence of events) are written out in plain English. Pilots' ages, home towns and medical details are left out on purpose. The documents and photographs are the NTSB's docket, the folder of records gathered during the investigation, shown as the NTSB released them (the NTSB redacts some personal details first) and listed under the NTSB's own titles. This site's own text never names pilots, passengers or anyone else involved. A preliminary report describes what is known soon after the event and can change; the final report, with the probable cause, usually follows one to two years later and this page is refreshed when it does. Case number ERA26LA162.