# NTSB CEN14FA173: Worthington Donald Wayne Sonerai II LT, N63917, Highlands Ranch, CO, March 29, 2014 - Type: NTSB accident investigation - Classification: Accident · Fatal · Field investigation · Final report - Date: March 29, 2014, 14:40 local (20:40 UTC) - Place: Highlands Ranch, CO - Coordinates: 39.552223, -105.003051 - Nearby events: https://openairdocs.org/map.md?lat=39.5522&lon=-105.0031&mi=10 - Phase of flight: [Emergency descent](https://openairdocs.org/ntsb-phases/600) (OpenAirDocs' grouping) - Defining event: [Emergency descent: Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241) - Highest injury: Fatal - Injuries: 1 fatal - Status: Completed, report June 23, 2014 - Report: Approved by Office Director - NTSB office: Central Region - NTSB case key (mKey): 88982 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN14FA173 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/88982/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=88982 - Page: https://openairdocs.org/ntsb/CEN14FA173 ## Probable cause The pilot’s loss of control during a forced landing following a loss of engine power for reasons that could not be determined due to postimpact fire damage. ## 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: [Worthington Donald Wayne SONERAI II LT, 1 case](https://openairdocs.org/ntsb-findings/01062000/cases.md?model=05607IS), [All aircraft, 1,269 cases](https://openairdocs.org/ntsb-findings/01062000/cases.md) - [Experience/qualifications: total experience w/ equipment](https://openairdocs.org/ntsb-findings/02031025): Personnel issues › Experience/knowledge · Pilot; cases with it: [Worthington Donald Wayne SONERAI II LT, 1 case](https://openairdocs.org/ntsb-findings/02031025/cases.md?model=05607IS), [All aircraft, 269 cases](https://openairdocs.org/ntsb-findings/02031025/cases.md) - [Experience/qualifications: recent experience](https://openairdocs.org/ntsb-findings/02031035): Personnel issues › Experience/knowledge · Pilot; cases with it: [Worthington Donald Wayne SONERAI II LT, 1 case](https://openairdocs.org/ntsb-findings/02031035/cases.md?model=05607IS), [All aircraft, 76 cases](https://openairdocs.org/ntsb-findings/02031035/cases.md) - [Fuel system](https://openairdocs.org/ntsb-findings/01022800): Aircraft › Aircraft systems · Not specified; cases with it: [Worthington Donald Wayne SONERAI II LT, 1 case](https://openairdocs.org/ntsb-findings/01022800/cases.md?model=05607IS), [All aircraft, 181 cases](https://openairdocs.org/ntsb-findings/01022800/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Enroute: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342); cases with it: [Worthington Donald Wayne SONERAI II LT, 1 case](https://openairdocs.org/ntsb-events/342/sequence.md?model=05607IS), [All aircraft, 1,858 cases](https://openairdocs.org/ntsb-events/342/sequence.md) - [Emergency descent: Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241) (defining event); cases with it: [Worthington Donald Wayne SONERAI II LT, 1 case](https://openairdocs.org/ntsb-events/241/sequence.md?model=05607IS), [All aircraft, 1,529 cases](https://openairdocs.org/ntsb-events/241/sequence.md) ## Analysis On the morning of the accident, the pilot terminated his first flight early due to a fuel leak in the fuel tank sight gauge. The pilot made a repair before taking off for a second flight. During the second flight, witnesses reported seeing the airplane in distress and hearing the engine sputtering as it approached an open field. The airplane overflew a set of power lines before rolling and impacting terrain, consistent with the pilot reducing the airspeed in an attempt to clear the power lines during a forced landing and subsequently stalling the airplane. The majority of the airplane fuselage and cockpit were consumed by a postimpact fire. Flight control continuity was verified from the cockpit to all flight control surfaces. Examination of the fuel system and engine were limited due to the fire damage, and a reason for the apparent loss of engine power could not be determined. The pilot hadn't flown in 10 years and had recently purchased the airplane. The pilot logged one flight with an instructor about 2 months before the accident, and he had not logged experience in the airplane type before the day of the accident. ## Factual narrative The 1999-model airplane, serial number 00024, was a low wing, fabric and metal covered airplane, with a fixed tricycle landing gear, and was configured for two occupants. The airplane was powered by a direct drive, horizontally opposed, carbureted, air-cooled, four-cylinder engine. The engine was a Volkswagen Aero Vee rated at 75 horsepower, and was driving a two-bladed constant pitch wooden propeller. The last inspections on the airframe and engine were each conditional type inspections on November 1, 2013. On March 29, 2014, about 1440 mountain daylight time, a Worthington Sonerai 11L experimental airplane, N63917, crashed near Highlands Ranch, Colorado. The private pilot was fatally injured and the airplane was destroyed. The airplane was registered to and operated by a private individual as a 14 Code of Federal Regulations Part 91 flight. Visual meteorological conditions prevailed for the local flight, which was not operated on a flight plan. The pilot purchased the airplane in November, 2013. The pilot's first flight in the airplane occurred the morning of the accident. The pilot told a family member that the first flight had terminated early due to a leak in the fuel sight gauge. The pilot made a repair to the airplane and took off for a second flight. Witnesses reported seeing the airplane "struggling to stay airborne," and that the engine was running roughly as the airplane approached an open field. The airplane was observed to cross over a set of power lines, roll to the left, and descend into the ground. A post-impact fire ensued. Clear tubing and materials suitable for replacing the fuel sight gauge were located in the pilot's hanger. A cracked section of tubing consistent with the fuel sight gauge was recovered from a garbage can in the hanger. The Douglas County coroner, located in Castle Rock, Colorado, performed an autopsy on the pilot on March 30, 2014. The cause of death was attributed to multiple blunt force injuries. The FAA, Toxicology Accident Research Laboratory, located in , conducted toxicological testing on the pilot. Testing for carbon monoxide and cyanide were negative. No volatiles or drugs were detected. Weather at APA at 1453 was reported as wind 330 degrees at six knots, 10 miles visibility, few clouds at 17,000 feet, a broken ceiling at 25,000 feet, and altimeter 29.97. The pilot, age 60, held a private pilot certificate with ratings for airplane single-engine land. His last Federal Aviation Administration (FAA) Third-class medical certificate was issued on April 19, 2006, with no limitations. An examination of the pilot's flight records indicated 573 total flight hours, with no hours in the accident model airplane. The flight records indicated a break in flying between September 19, 2003, and January 1, 2014. The pilot did not log any additional flight time following a single 1.2 hour flight on January 1, 2014, and the day of the accident. The airplane impacted an open field eight miles west of APA on a headingof 033 degrees. The airplane traveled approximately 50 feet from the initial impact point before coming to rest upright. The initial impact point consisted of a scrape mark where the left wing impacted and a shallow crater where the engine impacted. Fragments of the majority of the propeller were located at the engine impact point, or in the immediate area. The airplane fuselage was constructed primarily of metal tubing covered by fabric material. Fire consumed the fuselage covering from the engine cowling area aft to just forward of the horizontal stabilizer. The wings were manufactured of aluminum spars and ribs covered by a metal skin. Fire consumed the center sections of the wings that were connected to the fuselage, and outboard of the fuselage about one to two feet on each side of the fuselage. Flight control continuity was continuous from all control surfaces to their respective controls in the cockpit. An engine examination on scene revealed both propeller blades were broken off and splintered about eight to ten inches from the propeller hub. The propeller spinner exhibited crushing deformation to about two-thirds of its surface, with little to no rotational scoring or rotational deformation evident. The left and right cylinder head covers were separated, exposing the rocker arms for each cylinder. The propeller was rotated by hand and all rocker arms exhibited movement. The airplane was equipped with a 10 gallon aluminum fuel cell mounted aft of the engine firewall, and forward of the instrument panel. The fuel system included a sight gauge to monitor fuel available. The sight gauge consisted of a transparent rubber hose that was mounted vertically on the forward instrument panel so as to be visible during flight. About two-thirds of the fuel tank was consumed by fire. The sight gauge was not located in the wreckage. Fuel was gravity fed directly from the fuel tank to an Aerocarb slide style carburetor mounted on the engine. The carburetor was impact and fire damaged. Functional testing of the carburetor could not be accomplished due to the damage. The portion of the fuel feed lines from the finger strainer mounted in the tank to the gas valve was located. The portions of the fuel system that were located exhibited impact and fire damage. The remainder of the fuel system was not located due to fire and impact damage. No anomalies were noted with the available wreckage and the engine that would have precluded normal operation prior to impact. ## Aircraft - Registration: [N63917](https://openairdocs.org/deregistered/N63917-2017-02-21), registration cancelled 2017-02-21, S/N 00024, built 1999 (OpenAirDocs) - Reported make and model: WORTHINGTON DONALD WAYNE SONERAI II LT (2LT) - Registry model: [Worthington Donald Wayne SONERAI II LT](https://openairdocs.org/model/worthington-donald-wayne-sonerai-ii-lt) (registry code 05607IS) (OpenAirDocs) - Registry engine: [Volkswagen CONVERSION](https://openairdocs.org/engine/volkswagen-conversion) (registry code 63501, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 00024 - Year built: 1999 - Engines: VOLKSWAGEN CONVERSION 36 horsepower reciprocating - Damage: Destroyed - Flight: Personal, Part 91 - Operator: Peoples Jim M - Registered owner: Peoples Jim M - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Condition, November 1, 2013 - Departed: APA, Highlands Ranch, CO - Destination: APA, Highlands Ranch, CO - Airport: APA, Centennial ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 60; injuries: fatal; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; seat: rear; toxicology performed; flight hours: 573 total, 1 in this make and model, 515 as pilot in command, 1 in the last 90 days, 0 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 330° at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 59 °F - Altimeter: 29.96 inHg - Observed at: KAPA, 8 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 20140329003269A](https://openairdocs.org/incident/20140329003269A), Mar 29, 2014: Worthington Donald Wayne SONERAI II LT, Highland Ranch, CO, Destroyed, 1 fatal. On 03/29/2014, at approximately 1438 hrs. Mountain daylight time (MDT), N63917, an amateur built experimental Sonerai II Lt airplane was destroyed after… ## Docket (13 files) The files NTSB released with the investigation on June 9, 2014, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=88982. 24.8 MB in all. - Witness Statements (item 1, .PDF, 694 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413093&FileExtension=.PDF&FileName=Witness%20Statements-Redacted.PDF - Record of Interview - Wright (item 2, .PDF, 240 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413094&FileExtension=.PDF&FileName=Record%20of%20Interview%20-%20Wright-Redacted.PDF - Record of Conversation - Kirkhope (item 3, .PDF, 41 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413095&FileExtension=.PDF&FileName=Record%20of%20Conversation%20-%20%20Kirkhope-Redacted.PDF - Pilot Flight Records (item 4, .PDF, 501 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413096&FileExtension=.PDF&FileName=Pilot%20Flight%20Records-Redacted.PDF - Wright Letter to NTSB and FAA (item 5, .PDF, 18 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413097&FileExtension=.PDF&FileName=Wright%20Letter%20to%20NTSB%20and%20FAA-Master.PDF - Pilot Logbook (item 6, .PDF, 1.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413098&FileExtension=.PDF&FileName=Pilot%20Logbook-Redacted.PDF - Release of Aircraft Wreckage, NTSB Form 6120.15 (item 7, .PDF, 235 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413117&FileExtension=.PDF&FileName=Release%20of%20Aircraft%20Wreckage,%20NTSB%20Form%206120.15-Redacted.PDF - Toxicology Report - Pilot (item 8, .PDF, 113 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413105&FileExtension=.PDF&FileName=Toxicology%20Report%20-%20Pilot-Master.PDF - Photo 1. Repair items from hanger (item 9, .PDF, 600 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413099&FileExtension=.PDF&FileName=Photo%201.%20Repair%20items%20from%20hanger-Master.PDF - Photo 2. Wreckage left side view (item 10, .PDF, 5.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413100&FileExtension=.PDF&FileName=Photo%202.%20Wreckage%20left%20side%20view-Master.PDF - Photo 3. Wreckage front view (item 11, .PDF, 5.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413101&FileExtension=.PDF&FileName=Photo%203.%20Wreckage%20front%20view-Master.PDF - Photo 4. Wreckage rear view (item 12, .PDF, 5.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413102&FileExtension=.PDF&FileName=Photo%204.%20Wreckage%20rear%20view-Master.PDF - Photo 5. Engine Spinner (item 13, .PDF, 5.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413103&FileExtension=.PDF&FileName=Photo%205.%20Engine%20Spinner-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.