Amateur-built Supercub accident near Grove, Oklahoma, August 20, 2025
On August 20, 2025 at about 1:30 pm local time, a 2025 amateur-built Supercub, registered N633JC, was substantially damaged in an accident during landing near Grove, Oklahoma (Grove Rgnl airport). It was a flight test under general aviation rules (Part 91). 1 person had minor injuries. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
The pilot’s failure to maintain elevator control during the landing, which resulted in a nose over.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- August 20, 2025 · about 1:30 pm local time
- Place
- Grove, Oklahoma · Grove Rgnl · map
- Type
- Accident
- Injuries
- 1 person had minor injuries.
- Weather
- visual conditions (good weather)
- Aircraft
- Amateur-built Supercub NO SERIES, built 2025
- Registration
- N633JC · registry record · serial MA-1
- Damage
- Substantial damage
- Flight
- Flight test · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
During the landing roll on the dry grass strip, the pilot relaxed elevator pressure from the control stick before applying brakes and the airplane nosed over, coming to rest inverted. The airplane sustained substantial damage to the left wing, vertical stabilizer and the rudder. The pilot reported there were no preimpact mechanical malfunctions or failures with the airframe or the engine that would have precluded normal operation. The pilot reported that he should not have released elevator back pressure before coming to a complete stop.
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
- Nose over/nose down during landing defining event
The NTSB's findings
- Personnel issues › Task performance › Use of equip/info › Aircraft control › Pilot
Pilot
- Certificate: private
- Ratings: single-engine land
- Flight time: 1,858 hours in all; 22 in this make and model; 22 in the last 90 days; 22 in the last 30 days; 1,646 as pilot in command
- Last flight review: March 9, 2025
- Medical certificate: BasicMed (with waivers/limitations)
- Seat: frt
- Injury: minor injuries
The aircraft
- Airframe total time: 19.4 hours
- Last inspection: condition inspection, June 6, 2025
- Maximum gross weight: 2,400 lb
- Seats: 2
- Landing gear: fixed
- Engine: Lycoming Exp O-360 (piston); 0 hours total
The flight
- Departed from: GMJ Grove OK at 12:25 pm
- Flight plan: VFR
- Runway 18/3, 5,200 ft by 75 ft
Weather at the time
- Light: daylight
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 75°F (24°C), dew point 73°F (23°C)
- Altimeter: 30.05 inHg
- Observation at 8:35 am from KGMJ
Weather report (METAR): KGMJ 201335Z AUTO VRB04KT 10SM CLR 24/23 A3005 RMK AO2 TSNO,M
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight crew | 1 |
Photographs from the investigation 2 pictures from the NTSB's docket, as the NTSB released them
The NTSB's photographs with the NTSB's captions, at screen size. Open a picture to see it full size or to report one that should not be shown.
Documents from the investigation the NTSB's docket: the evidence folder behind the report
2 documents, released by the NTSB on November 4, 2025. View them here, or download them; the NTSB redacts some personal details before release, and this site shows the NTSB's own titles rather than its file names.
| # | Document | What it is | |
|---|---|---|---|
| 1 | Pilot/operator Aircraft Accident Report, NTSB Form 6120.1 | PDF, 11 pages | View Download |
| 2 | Investigation Photographs | PDF, 3 pages · our copy | View Download |
The same docket at the NTSB · documents without a copy here are fetched from the NTSB when you open them.
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.