# NTSB CEN26LA018: Burkhart Grob Flugzeugbau G102 Astir CS, N137SS, Wallis, TX, October 11, 2025 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: October 11, 2025, 16:17 local (21:17 UTC) - Place: Wallis, TX - Coordinates: 29.6306, -96.0628 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=29.6306&lon=-96.0628&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report February 12, 2026 - Report: Approved by Office Director - Investigation class: Class 4 - Basic report with no Prelim publish - NTSB office: Central Region - Parties: Federal Aviation Administration, Houston FSDO - NTSB case key (mKey): 201840 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN26LA018 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/201840/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=201840 - Page: https://openairdocs.org/ntsb/CEN26LA018 ## Probable cause The pilot’s failure to maintain control during landing roll that resulted in an impact with terrain. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Performance/control parameters](https://openairdocs.org/ntsb-findings/01062000): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Burkhart Grob Flugzeugbau G102 ASTIR CS, 1 case](https://openairdocs.org/ntsb-findings/01062000/cases.md?model=1660104), [All aircraft, 1,269 cases](https://openairdocs.org/ntsb-findings/01062000/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Burkhart Grob Flugzeugbau G102 ASTIR CS, 1 case](https://openairdocs.org/ntsb-events/230/sequence.md?model=1660104), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) ## Analysis The pilot stated that he intended to land long on the runway and stop at the north end of airport, between a plowed field and a hangar. He stated that there was a right crosswind, which was within the maximum crosswind capability of the glider. During landing and about 10 feet or less above the runway, the pilot closed the air brakes and allowed ground effect to enable the glider to reach the planned touchdown point. During landing rollout, he made use of minimal speed brakes to keep the glider rolling. As the glider approached the plowed field, he applied left rudder and inadvertently lowered the left wing. Within a few seconds, the glider made a sharp left turn, which the pilot could not remediate with corrective control input. The glider sustained substantial damage to the left and right wings. There were no mechanical anomalies with the glider that would have precluded normal operation. The pilot stated that the accident could have been prevented by keeping the wings level during landing rollout and by not extending the ground roll into area of the plowed field and hangar. ## Aircraft - Registration: [N137SS](https://openairdocs.org/aircraft/N137SS), registered now, S/N 1348, built 1976 (OpenAirDocs) - Reported make and model: BURKHART GROB FLUGZEUGBAU G102 ASTIR CS - Registry model: [Burkhart Grob Flugzeugbau G102 ASTIR CS](https://openairdocs.org/model/burkhart-grob-flugzeugbau-g102-astir-cs) (registry code 1660104) (OpenAirDocs) - Registry engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000, none) (OpenAirDocs) - Category: Glider - Serial number: 1348 - Year built: 1976 - Airframe hours: 2606.1 - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Pilot - Registered owner: Greater Houston Soaring Association - Airworthiness certificate: None - Last inspection: Annual, January 15, 2025 - Destination: Same as departure - Airport: TE71, GHSA-Wallis Glideport, runway 36, 4,000 × 125 ft, grass/turf ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 24; injuries: none; private; last flight review October 22, 2023; seat: single; restraint: 4-point; flight hours: 100 total, 32 in this make and model, 72 as pilot in command, 30 in the last 90 days, 18 in the last 30 days, 0 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 130° at 4 knots - Visibility: 10 statute miles - Temperature: 88 °F, dew point 52 °F - Altimeter: 29.91 inHg - Observed at: TME, 13 nm away ## Docket (2 files) The files NTSB released with the investigation on February 12, 2026, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=201840. 2.2 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 10 pages, 1.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19466054&FileExtension=pdf&FileName=6120%20Master_Redacted-Rel.pdf - Photos (item 2, PDF, 4 pages, 482 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19772069&FileExtension=pdf&FileName=Photo%20Template-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.