- Date
- August 20, 2025, 08:30 local (13:30 UTC)
- Place
- Grove, OK
- Injuries
- 1 minor
- Damage
- Substantial damage
- Phase of flight
- Landing
- Aircraft
- N633JCEXP Supercub
- Defining event
- Landing: Nose over/nose down
- Weather
- Visual (VMC) · Day
- Status
- Completed · report October 30, 2025
- Report
- Approved by Office Director
- Investigation class
- Class 4 - Basic report with no Prelim publish
- NTSB office
- Central Region
- Parties
- FAA Oklahoma City FSDO
- FAA report
- 20250820010489A
- Case key
- 200829
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
The pilot’s failure to maintain elevator control during the landing, which resulted in a nose over.
Findings · 1
NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.
Sequence of events
The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.
Analysis
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.
Aircraft
- Registration
- N633JC
- Reported as
- EXP Supercub (NO SERIES)
- Category
- Airplane, amateur-built
- Serial number
- MA-1
- Built
- 2025
- Airframe hours
- 19.4
- Engine
- Lycoming EXP O-360, 180 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Flight test · Part 91
- Airworthiness certificate
- Special, Experimental (Special)
- Last inspection
- Condition · June 6, 2025
- Departed
- GMJ · Grove, OK
- Destination
- Same as departure
- Flight plan
- VFR
- Airport
- GMJ · Grove Rgnl, runway 18/36, 5,200 × 75 ft, asphalt
- Equipment
- Onboard weather, ADS-B, Angle of attack indicator, Electronic multifunction display, Electronic primary flight display
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 71
- Injuries
- Minor
- Certificate
- Private
- Airplane ratings
- Single-engine land
- Medical
- BasicMed, With waivers/limitations
- Last flight review
- March 9, 2025
- Seat
- Front
- Restraint
- 4-point
- Flight hours
- 1,858 total · 22 in this make and model · 1,646 as pilot in command · 22 in the last 90 days · 22 in the last 30 days · 1.2 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Visibility
- 10 statute miles
- Lowest ceiling
- None
- Temperature
- 75 °F, dew point 73 °F
- Altimeter
- 30.05 inHg
- Observed at
- KGMJ
- METAR
- KGMJ 201335Z AUTO VRB04KT 10SM CLR 24/23 A3005 RMK AO2 TSNO,M
Docket · 2
The files NTSB released with the investigation on November 4, 2025, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.5 MB in all.
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.