# NTSB CEN25LA311: Schweizer SGS 2-33A, N65818, Monee, IL, August 6, 2025 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: August 6, 2025, 14:57 local (19:57 UTC) - Place: Monee, IL - Coordinates: 41.377385, -87.689964 - Nearby events: https://openairdocs.org/map.md?lat=41.3774&lon=-87.6900&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Defining event: [Approach-VFR pattern base: Controlled flight into terr/obj (CFIT)](https://openairdocs.org/ntsb-events/120) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report October 17, 2025 - Report: Approved by Office Director - Investigation class: Class 4 - Basic report with no Prelim publish - NTSB office: Central Region - Parties: FAA - NTSB case key (mKey): 200737 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN25LA311 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/200737/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=200737 - Page: https://openairdocs.org/ntsb/CEN25LA311 ## Probable cause The student pilot’s failure to maintain airspeed and altitude resulting in a collision with the ground during the base to final turn. ## 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: [Schweizer SGS 2-33A, 13 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=8051606), [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. - [Approach-VFR pattern base: Controlled flight into terr/obj (CFIT)](https://openairdocs.org/ntsb-events/120) (defining event); cases with it: [Schweizer SGS 2-33A, 2 cases](https://openairdocs.org/ntsb-events/120/sequence.md?model=8051606), [All aircraft, 1,074 cases](https://openairdocs.org/ntsb-events/120/sequence.md) ## Analysis The solo student pilot reported she was on downwind to land and noted she was a bit lower than usual so she turned base early to compensate. While on the base leg her recollection of events wasn’t clear. She remembered feeling task saturated and that she may not have maintained her altitude and airspeed resulting in the glider impacting the ground during the base to final turn. The glider came to rest upright on a flat grass field and the pilot was able to egress without further incident. The fuselage and right wing were substantially damaged. The pilot reported there were no preimpact mechanical malfunctions of failures with the glider that would have precluded normal operation. The pilot further reported that the accident could have been prevented by paying closer attention to the glider’s altitude and airspeed while in the traffic pattern. ## Aircraft - Registration: [N65818](https://openairdocs.org/aircraft/N65818), registered now, S/N 303, built 1973 (OpenAirDocs) - Reported make and model: SCHWEIZER SGS 2-33A - Registry model: [Schweizer SGS 2-33A](https://openairdocs.org/model/schweizer-sgs-2-33a) (registry code 8051606) (OpenAirDocs) - Registry engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000, none) (OpenAirDocs) - Category: Glider - Serial number: 303 - Year built: 1973 - Airframe hours: 4841.9 - Damage: Substantial damage - Flight: Instructional, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: 100 hour, February 5, 2025 - Destination: Same as departure - Airport: C56, Bult Fld - Equipment: None ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 15; injuries: none; student; seat: front; flight hours: 8 total ## Weather - Conditions: Visual (VMC), Day - Wind: 220° at 5 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 86 °F, dew point 63 °F - Altimeter: 30.22 inHg - Observed at: KIGQ, 12 nm away - METAR: KIGQ 061955Z AUTO 22005KT 10SM CLR 30/17 A3022 RMK AO2 T02970173 ## 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 20250806012719A](https://openairdocs.org/incident/20250806012719A), Aug 6, 2025: Schweizer SGS 2-33A, Monee, IL, Substantial damage. On August 6th, 2025 at approximately 05:19 pm CDT, a student pilot was operating a Schweizer sgs 2-33 glider in the vicinity of bult field, C56 on a solo… ## Other investigations on N65818 (1) 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. - [NTSB BFO85LA053](https://openairdocs.org/ntsb/BFO85LA053), Jul 7, 1985: Schweizer 2-33A (N65818), Warrenton, VA, substantial damage ## Docket (2 files) The files NTSB released with the investigation on October 17, 2025, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=200737. 6.4 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 10 pages, 3.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19268402&FileExtension=pdf&FileName=CEN25LA311%20-%206120_1_Redacted-Rel.pdf - Photos (item 2, PDF, 6 pages, 5 photos, 2.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19268440&FileExtension=pdf&FileName=CEN25LA311%20-%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.