# NTSB CEN13LA046: Sorensen Sprint Mxii, N460JS, Groesbeck, TX, November 5, 2012 - Type: NTSB accident investigation - Classification: Accident · Fatal · Limited investigation · Final report - Date: November 5, 2012, 11:35 local (17:35 UTC) - Place: Groesbeck, TX - Coordinates: 31.427778, -96.470832 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=31.4278&lon=-96.4708&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Defining event: [Initial climb: Loss of control in flight](https://openairdocs.org/ntsb-events/240) - Highest injury: Fatal - Injuries: 1 fatal - Status: Completed, report July 30, 2014 - Report: Approved by Office Director - NTSB office: Central Region - NTSB case key (mKey): 85519 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN13LA046 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/85519/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=85519 - Page: https://openairdocs.org/ntsb/CEN13LA046 ## Probable cause The pilot’s failure to maintain control of the noncertificated airplane during a go-around. Contributing to the accident was the pilot’s physical and psychological impairment. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Impairment/incapacitation: oTC medication](https://openairdocs.org/ntsb-findings/02012030): Personnel issues › Physical · Pilot (probable cause); cases with it: [Darrell G Sorensen SPRINT MX II, 1 case](https://openairdocs.org/ntsb-findings/02012030/cases.md?model=05631H3), [All aircraft, 56 cases](https://openairdocs.org/ntsb-findings/02012030/cases.md) - [Impairment/incapacitation: prescription medication](https://openairdocs.org/ntsb-findings/02012025): Personnel issues › Physical · Pilot (probable cause); cases with it: [Darrell G Sorensen SPRINT MX II, 1 case](https://openairdocs.org/ntsb-findings/02012025/cases.md?model=05631H3), [All aircraft, 77 cases](https://openairdocs.org/ntsb-findings/02012025/cases.md) - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Darrell G Sorensen SPRINT MX II, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=05631H3), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Health/Fitness: predisposing condition](https://openairdocs.org/ntsb-findings/02013035): Personnel issues › Physical · Pilot (probable cause); cases with it: [Darrell G Sorensen SPRINT MX II, 1 case](https://openairdocs.org/ntsb-findings/02013035/cases.md?model=05631H3), [All aircraft, 56 cases](https://openairdocs.org/ntsb-findings/02013035/cases.md) - [Performance/control parameters](https://openairdocs.org/ntsb-findings/01062000): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Darrell G Sorensen SPRINT MX II, 1 case](https://openairdocs.org/ntsb-findings/01062000/cases.md?model=05631H3), [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. - [Initial climb: Loss of control in flight](https://openairdocs.org/ntsb-events/240) (defining event); cases with it: [Darrell G Sorensen SPRINT MX II, 1 case](https://openairdocs.org/ntsb-events/240/sequence.md?model=05631H3), [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: [Darrell G Sorensen SPRINT MX II, 1 case](https://openairdocs.org/ntsb-events/470/sequence.md?model=05631H3), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot departed his private airstrip to the south for a local flight. GPS data indicated that the pilot flew the airplane to an area about 15 miles southwest of the departure airstrip and then made several low-altitude circling maneuvers in this area before heading back toward the airstrip. The pilot then flew several circling maneuvers east of the airstrip followed by a low pass to the south. The airplane then climbed and again maneuvered east of the airstrip before continuing to the south end of the airstrip; however, it made a 180-degree turn and subsequently departed to the north and then returned to land. A witness reported that the pilot appeared to abort the landing and that the airplane pitched up and then banked left and descended into the trees. The airplane came to rest in the trees about 15 feet above the ground. The witness reported that the engine continued to run after the impact. Flight control continuity was established during the postaccident examination of the airplane, which did not have an airworthiness certificate. Postaccident weight and balance calculations indicate that the airplane's center of gravity (CG) was aft of the maximum aft CG limit. However, given that the pilot was able to take off without any problems, the airplane was likely controllable even though the CG was aft of its maximum limit. Toxicological results and medical records indicate the pilot was likely experiencing some level of impairment due to diagnosed, chronic, medical and psychiatric conditions and the effects of the medications he was taking for these conditions. ## Factual narrative The trees surrounding the south end of the airstrip were 15 to 20 feet tall versus the trees at the north end of the airstrip which were 75 – 100 feet tall. The pilot's wife stated that in the past the pilot had taken off and landed to the south due to the height of the trees. The 2-place amateur-built Sorensen MX II Sprint airplane was built by the pilot from a Quicksilver MX II Sprint Kit. The Quicksilver MX II Sprint is a 2-place, single wing, open cockpit airplane which is often used as an ultralight trainer. A Bill of Sale indicates the pilot purchased the kit on April 7, 2011. He registered the airplane on August 30, 2011. The airplane did not have an airworthiness certificate. The airplane was powered by a 65 horsepower, 2-cylinder, 2-stroke liquid cooled Rotax 582 engine. The airplane was equipped with 2-6 gallon fuel tanks. The pilot had been working at resolving weight and balance, and trim issues with the airplane. In the process of doing this, he shimmed the stabilizer and moved the seats forward. Although the pilot had not weighed the aircraft, postaccident weight and balance calculations using the empty weight of a comparable airplane, indicate the center of gravity of the accident airplane was aft of the aft center of gravity limit. The airplane hobbs meter indicated 13.1 hours. According to the pilot's wife he had actually flown the airplane about 3 hours. The GPS contained data from one previous flight. Meteorological Conditions At 1151, the weather reported at the Waco Regional Airport (ACT), Waco, Texas, located 45 miles west off the accident sire was: Wind 010 degrees at 8 knots; 10 miles visibility; clear sky; temperature 25 degrees Celsius; dew point 11 degrees Celsius; altimeter 30.04 inches of mercury. On November 5, 2012, at 1135 central standard time, an amateur-built Sorensen MX II Sprint, collided with trees during an aborted landing from a private airstrip in Groesbeck, Texas. The pilot was fatally injured and the airplane received minor damage. The flight was being conducted under the provisions of 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed and no flight plan was filed. The local flight originated from the private airstrip about 0941. A handheld global positioning system (GPS) that was on the airplane contained data for the accident flight. GPS data showed the pilot took off on a southerly heading from his private airstrip. The airstrip is approximately 1,000 feet long and is on a magnetic heading of 02/22. The GPS data indicated the airplane then flew on a southwesterly heading toward the town of Davis Prairie and continued to amd area just northwest of Alto Springs. The airplane made several circling maneuvers in this area, at one point descending to an altitude of 584 feet above mean sea level (msl), which was about 150 feet above ground level (agl). The airplane then headed east to the town of Kosse before turning northeast back toward the departure airstrip. The airplanemaneuvered to the east of the airstrip then made a low pass on runway 22 descending to an altitude of about 100 feet agl. The airplane climbed and maneuvered to the east of the airstrip then once again lined up with runway 22. The data indicates that the airplane landed to the south and made a 180 degree turn before departing to the north, runway 02. After taking off, the airplane made a left hand traffic pattern and returned to land on runway 02. The second to last data point shows the airplane about 400 feet down the runway at an altitude of about 30 feet agl at a calculated ground speed of 32 knots. The last data point shows the airplane off the left side of the runway. The pilot's wife reported to the Federal Aviation Administration (FAA) Inspector that the airplane was coming in to land and it appeared that the pilot aborted the landing. The airplane was starting to climb when it banked to the left and impacted the trees. She stated the engine of the airplane continued to run after the airplane impacted the trees. An autopsy was performed on the pilot on November 6, 2012, at the Southwestern Institute of Forensic Sciences at Dallas. The cause of death was reported as "Multiple blunt for injuries." Forensic toxicology was performed on speimens from the pilot by the FAA Bioaeronautical Sciences Research Laboratory, Oklahoma City, Oklahoma. The test results revealed: 0.159 (ug/mL, ug/g) 7-Amino-clonazepam detected in Urine 7-Amino-clonazepam NOT detected in Blood (Cavity) Amlodipine detected in Blood (Cavity) Amlodipine detected in Urine Desmethylsertraline detected in Urine 0.118 (ug/mL, ug/g) Desmethylsertraline detected in Blood (Cavity) Dihydrocodeine NOT detected in Blood (Cavity) 0.309 (ug/mL, ug/g) Dihydrocodeine detected in Urine Diphenhydramine detected in Urine 0.064 (ug/ml, ug/g) Diphenhydramine detected in Blood (Cavity) 0.641 (ug/mL, ug/g) Hydrocodone detected in Urine Hydrocodone NOT detected in Blood (Cavity) 0.396 (ug/mL, ug/g) Hydromorphone detected in Urine Hydromorphone NOT detected in Blood (Cavity) Methylphenidate NOT detected in Blood (Cavity) Methylphenidate detected in Urine Pramipexole detected in Blood (Cavity) Pramipexole detected in Urine Ranitidine detected in Blood (Cavity) Ranitidine detected in Urine Sertraline detected in Urine 0.109 (ug/mL, ug/g) Sertraline detected in Blood (Cavity) Terazosin detected in Blood (Cavity) Terazosin detected in Liver Terazosin detected in Urine 0.031 (ug/ml, ug/g) Zolpidem detected in Blood (Cavity) Zolpidem detected in Urine According to the pilot's wife he was being treated for hypertension, high cholesterol, prostatism, and occasionally took zolpidem to help him sleep. The pilot's personal medical records were reviewed by the National Transportation Safety Board medical officer. Those records indicated that during the past year, the pilot was treated for hypertension, high cholesterol, prostatism, a chronic pain syndrome, depression, anxiety, panic disorder, attention deficitwith hyperactivity disorder, insomnia, and restless leg syndrome. The pilot, age 69, held an Airline Transport Pilot certificate with an airplane multi-engine land rating and a Commercial Pilot certificate with an airplane single-engine land rating. In addition, the pilot held an Airframe and Powerplant Mechanic certificate. The pilot did not have a current FAA airman medical certificate. The pilot's last FAA medical certificate was first class certificate issued on January 1, 2003. The pilot reported having 12,500 hours of flight time on the application for his last medical certificate. No other records were located indicating what additional flight time the pilot may have accumulated. The pilot's wife stated that he had about 3 hours of flight time in the accident airplane. The airplane came to rest in the trees off the left side of runway 02 at a distance about 600 feet down the runway from the approach end. The nose of the airplane was pointed up and was higher in the trees then the tail of the airplane which was just above the ground. The airplane received minor damage during the impact. Flight control continuity was established during the postaccident examination of the airplane. The pilot's wife stated she heard the engine running after the airplane impacted the trees, and that it continued to run while she made the 911 call. First responders reported that the pilot's seatbelt was found unbuckled and the pilot was on the ground near the airplane. The engine ignition switch was found turned to the off position. A postaccident inspection of the pilot's seat belt revealed it was intact and operational. ## Aircraft - Registration: [N460JS](https://openairdocs.org/deregistered/N460JS-2018-01-05), registration cancelled 2018-01-05, S/N 0686 (OpenAirDocs) - Reported make and model: SORENSEN SPRINT MXII (NO SERIES) - Registry model: [Darrell G Sorensen SPRINT MX II](https://openairdocs.org/model/darrell-g-sorensen-sprint-mx-ii) (registry code 05631H3) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 0686 - Airframe hours: 13 - Engines: Rotax 582 65 horsepower reciprocating - Damage: Minor damage - Flight: Flight test, Part 91 - Operator: Darrel G. Sorensen - Registered owner: Darrel G. Sorensen - Airworthiness certificate: None - Departed: PVT, Groesbeck, TX - Destination: PVT, Groesbeck, TX - Airport: PVT, Private, runway 02, 1,000 × 100 ft, dirt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 69; injuries: fatal; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; seat: left; restraint: lap only; toxicology performed; flight hours: 12,500 total, 3 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 10° at 8 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 77 °F, dew point 52 °F - Altimeter: 30.04 inHg - Observed at: KACT, 45 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 20121105025099A](https://openairdocs.org/incident/20121105025099A), Nov 5, 2012: Darrell G Sorensen SPRINT MX II, Groesbech, TX, Minor damage, 1 fatal. On 5 November 2012 the aircraft N460JS a quicksilver sprint mark ii serial number 0686 was executing a go around after an aborted landing to the north at the… ## Docket (11 files) The files NTSB released with the investigation on June 26, 2014, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=85519. 21.9 MB in all. - GPS - Specialist's Factual Report (item 1, .PDF, 4 photos, 1.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40385852&FileExtension=.PDF&FileName=GPS%20-%20Specialist%27s%20Factual%20Report-Master.PDF - Attachment 1 - GPS Specialist's Factual Report (item 2, .CSV, 40 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40385853&FileExtension=.csv&FileName=Attachment%201%20-%20GPS%20Specialist%27s%20Factual%20Report-Master.csv - Medical Factual (item 3, .PDF, 150 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40396419&FileExtension=.PDF&FileName=Medical%20Factual-Master.PDF - Email (item 4, .PDF, 59 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413639&FileExtension=.PDF&FileName=Email-Redacted.PDF - Weight and Balance Information (item 5, .PDF, 449 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413640&FileExtension=.PDF&FileName=Weight%20and%20Balance%20Information-Master.PDF - Toxicological Report (item 6, .PDF, 99 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413641&FileExtension=.PDF&FileName=Toxicological%20Report-Redacted.PDF - Photo 1. Wreckage in Trees (item 7, .PDF, 4.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413642&FileExtension=.PDF&FileName=Photo%201.%20Wreckage%20in%20Trees-Master.PDF - Photo 2. Wreckage in Trees (item 8, .PDF, 3.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413643&FileExtension=.PDF&FileName=Photo%202.%20Wreckage%20in%20Trees-Master.PDF - Photo 3. Wing and Engine (item 9, .PDF, 3.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413644&FileExtension=.PDF&FileName=Photo%203.%20Wing%20and%20Engine-Master.PDF - Photo 4. N460JS (item 10, .PDF, 4.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413645&FileExtension=.PDF&FileName=Photo%204.%20N460JS-Master.PDF - Photo 5. Airstrip Looking North (item 11, .PDF, 2.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413646&FileExtension=.PDF&FileName=Photo%205.%20Airstrip%20Looking%20North-Master.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.