# NTSB DFW08LA220: Schleicher ASW-20B, N30WK, Cleburne, TX, August 31, 2008 - Type: NTSB accident investigation - Classification: Accident · Fatal · Limited investigation · Final report - Date: August 31, 2008, 14:18 local (19:18 UTC) - Place: Cleburne, TX - Coordinates: 32.276943, -97.313331 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=32.2769&lon=-97.3133&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Defining event: [Approach: Unknown or undetermined](https://openairdocs.org/ntsb-events/000) - Highest injury: Fatal - Injuries: 1 fatal - Status: Completed, report January 29, 2009 - Report: Approved by Office Director - Parties: FAA FSDO - NTSB case key (mKey): 68849 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DFW08LA220 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/68849/pdf - Page: https://openairdocs.org/ntsb/DFW08LA220 ## Probable cause Loss of control inflight for undetermined reason. ## 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; cases with it: [Schleicher ASW-20B, 1 case](https://openairdocs.org/ntsb-findings/01062000/cases.md?model=3801520), [All aircraft, 1,269 cases](https://openairdocs.org/ntsb-findings/01062000/cases.md) - [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [Schleicher ASW-20B, 1 case](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=3801520), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Approach: Unknown or undetermined](https://openairdocs.org/ntsb-events/000) (defining event); cases with it: [Schleicher ASW-20B, 1 case](https://openairdocs.org/ntsb-events/000/sequence.md?model=3801520), [All aircraft, 1,703 cases](https://openairdocs.org/ntsb-events/000/sequence.md) - [Approach: Loss of control in flight](https://openairdocs.org/ntsb-events/240); cases with it: [Schleicher ASW-20B, 1 case](https://openairdocs.org/ntsb-events/240/sequence.md?model=3801520), [All aircraft, 5,002 cases](https://openairdocs.org/ntsb-events/240/sequence.md) - [Uncontrolled descent: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Schleicher ASW-20B, 2 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=3801520), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis While performing a landing into an open field, the glider pilot experienced a loss of control and impacted terrain. An examination of the wreckage did not reveal any pre-impact anolmalies. A review of the Cambridge Aero Instrument data recording device displayed that after failing to acquire thermal lift, the pilot manuevered for a left base pattern to a grass field. A low level of diphenhydramine, an over the counter sedating antihistamine often known by the trade name Benadryl, was found in the pilot's blood, well below the concentrations normally associated with impairment. ## Factual narrative On August 31, 2008, at approximately 1418 central daylight time, a Schleicher. ASW-20B glider, N30WK, was substantially damaged upon impact with terrain near Cleburne, Texas. The commercial pilot, the sole occupant, was fatally injured. The glider was owned and operated by a private individual. Visual meteorological conditions prevailed and no flight plan was filed for the 14 Code of Federal Regulations Part 91 personal flight. The flight originated from TSA Gliderport (TA11), Midlothian, Texas as a local flight at approximately 1326. A local resident contacted emergency services to inform them that a glider had crashed. An inspector from the Federal Aviation Administration (FAA) also responded and documented the crash site. The glider impacted an open field near a residence. The flaps were set to "2" corresponding with -6 degrees of flaps (flaps up 6 degrees). The wreckage was recovered to a secure location for examination. An examination was conducted by the NTSB Investigator-in-Charge. Flight control continuity was established to the rudder, elevator, and ailerons. Continuity to the airbrakes and flaps was also established. No pre-impact anomalies were discovered with the airframe. The accident flight was recorded by an Cambridge Aero Instruments data recording device. An examination of the data revealed that the glider was towed from TA11 and began a flight to the southwest of the airport. The device recorded several successful attempts to thermal the glider. At approximately 1355 the glider began maneuvering to obtain thermal lift, but continued to descend. The flight continued over a field and the glider appeared to enter a normal left traffic pattern. The last recorded point was at 1417 with the glider at 895 feet mean sea level (about 150 feet above ground level), traveling 29 miles per hour, in a descent of approximately 390 feet per minute on "final approach" leg. The glider pilot had logged over 5,279 hours in various military and civilian aircraft. The pilot had logged approximately 399 hours in gliders with at least 7.5 hours in the accident glider. An autopsy was performed on the pilot by the Tarrant County Medical Examiner's Office, Fort Worth, Texas. The medical examiner ruled the manner of death as a result of multiple blunt force trauma. Forensic toxicology was performed on specimens from the pilot by the FAA Bioaeronautical Sciences Research Laboratory, Oklahoma City, Oklahoma. The toxicology report stated the presence of carbon monoxide, cyanide, was ethanol was not detected. The report notes: DIPHENHYDRAMINE detected in Blood DIPHENHYDRAMINE detected in Liver IBUPROFEN detected in Blood According to the Chief of the FAA Forensic Toxicology Research Team, diphenhydramine was not quantified in the pilot's blood because the level was below the laboratory's calibration curve. At 1425, an automated weather reporting station located at Cleburne Municipal Airport (CPT), located approximately 9 miles northwest of the accident sitereported winds from 120 degrees at 4 knots, visibility 10 miles, skies clear, temperature 90 degrees Fahrenheit, dew point 72 degrees Fahrenheit and a barometric pressure of 29.96 inches of Mercury. ## Aircraft - Registration: [N30WK](https://openairdocs.org/deregistered/N30WK-2009-11-16), registration cancelled 2009-11-16, S/N 20641, built 1983 (OpenAirDocs) - Reported make and model: SCHLEICHER ASW-20B - Registry model: [Schleicher ASW-20B](https://openairdocs.org/model/schleicher-asw-20b) (registry code 3801520) (OpenAirDocs) - Registry engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000, none) (OpenAirDocs) - Category: Glider - Serial number: 20641 - Airframe hours: 1513 - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: James Rider - Registered owner: James Rider - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Annual, March 30, 2008 - Departed: TA11, MIDLOTHIAN, TX ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 71; injuries: fatal; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, without waivers/limitations; last flight review August 22, 2007; seat: single; toxicology performed; flight hours: 5,279 total, 8 in this make and model, 1 in the last 90 days, 5 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 120° at 4 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 90 °F, dew point 72 °F - Altimeter: 29.95 inHg - Observed at: CPT, 9 nm away ## 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 20080831844919A](https://openairdocs.org/incident/20080831844919A), Aug 31, 2008: Schler ASW20B, Cleburne, TX, Destroyed, 1 fatal. (-23) At approximately 1430CDT a passing motorist notified a local resident that the aircraft had crashed. The local resident was the first person on-scene and… 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.