# NTSB CEN25LA330: EXP Supercub, N633JC, Grove, OK, August 20, 2025 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Class 4 · Limited · Final report - Date: August 20, 2025, 08:30 local (13:30 UTC) - Place: Grove, OK - Coordinates: 36.606778, -94.738556 - Nearby events: https://openairdocs.org/map.md?lat=36.6068&lon=-94.7386&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing: Nose over/nose down](https://openairdocs.org/ntsb-events/096) - Highest injury: Minor injuries - Injuries: 1 minor - 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 - NTSB case key (mKey): 200829 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN25LA330 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/200829/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=200829 - Page: https://openairdocs.org/ntsb/CEN25LA330 ## Probable cause The pilot’s failure to maintain elevator control during the landing, which resulted in a nose over. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [John Carl Mcintyre EXP SUPER CUB, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=05642EE), [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: Nose over/nose down](https://openairdocs.org/ntsb-events/096) (defining event); cases with it: [John Carl Mcintyre EXP SUPER CUB, 1 case](https://openairdocs.org/ntsb-events/096/sequence.md?model=05642EE), [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md) ## 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](https://openairdocs.org/aircraft/N633JC), registered now, S/N MA-1, built 2025 (OpenAirDocs) - Reported make and model: EXP Supercub (NO SERIES) - Registry model: [John Carl Mcintyre EXP SUPER CUB](https://openairdocs.org/model/john-carl-mcintyre-exp-super-cub) (registry code 05642EE) (OpenAirDocs) - Registry engine: [Lycoming O-360 series](https://openairdocs.org/engine/lycoming-o-360-series) (registry code 41575, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: MA-1 - Year built: 2025 - Airframe hours: 19.4 - Engines: 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 ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 71; injuries: minor; 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 ## 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 20250820010489A](https://openairdocs.org/incident/20250820010489A), Aug 20, 2025: John Carl Mcintyre EXP SUPER CUB, Grove, OK, Substantial damage. On August 20, 2025, this office was notified by the regional operations center (roc) about an aircraft accident that occurred around 08:30AM at Grove regional… ## Docket (2 files) The files NTSB released with the investigation on November 4, 2025, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=200829. 1.5 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 11 pages, 303 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19411794&FileExtension=pdf&FileName=6120_N633JC_Redacted-Rel.pdf - Investigation photographs (item 2, PDF, 3 pages, 1.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19411462&FileExtension=pdf&FileName=Invest%20Photos-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. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.