# NTSB CEN10LA234: CGS Hawk, Haysville, KS, May 2, 2010 - Type: NTSB accident investigation - Classification: Accident · Fatal · Limited investigation · Final report - Date: May 2, 2010, 17:13 local (22:13 UTC) - Place: Haysville, KS - Coordinates: 37.561805, -97.353935 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=37.5618&lon=-97.3539&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Defining event: [Initial climb: Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241) - Highest injury: Fatal - Injuries: 1 fatal - Status: Completed, report February 6, 2012 - Report: Approved by Office Director - NTSB office: Central Region - Parties: FAA - NTSB case key (mKey): 75913 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN10LA234 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/75913/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=75913 - Page: https://openairdocs.org/ntsb/CEN10LA234 ## Probable cause The pilot’s failure to maintain adequate airspeed, which resulted in an aerodynamic stall and loss of control of the airplane, for undetermined reasons. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Performance/control parameters: airspeed](https://openairdocs.org/ntsb-findings/01062010): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [All aircraft, 1,681 cases](https://openairdocs.org/ntsb-findings/01062010/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Initial climb: Unknown or undetermined](https://openairdocs.org/ntsb-events/000); cases with it: [All aircraft, 1,703 cases](https://openairdocs.org/ntsb-events/000/sequence.md) - [Initial climb: Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241) (defining event); cases with it: [All aircraft, 1,529 cases](https://openairdocs.org/ntsb-events/241/sequence.md) ## Analysis Witnesses observed the airplane flying low over houses. One witness stated that he heard the engine power decrease and that the airplane’s pitch attitude increased until the airplane stalled, descended in a spin, and impacted the ground. A postaccident examination of the wreckage and engine did not reveal any anomalies that would have precluded normal operation. The pilot had a history of pulmonary embolism; however, there are no indications that a medical condition contributed to the accident. The reason for the apparent loss of airspeed and the resultant stall could not be determined. ## Factual narrative On May 2, 2010, about 1713 central daylight time, an unregistered CGS Hawk ultra-light airplane was substantially damaged after impacting terrain near Haysville, Kansas. The private pilot was fatally injured. The local flight originated at Selby Farm Airport (35KS), Derby, Kansas and was being conducted under the provisions of 14 Code of Federal Regulations Part 91 without a flight plan. Visual meteorological conditions prevailed at the time of the accident. Witnesses observed the airplane depart 35KS to the south and turn to the west. One witness estimated the aircraft reached 300 to 400 feet above the ground. Witnesses described hearing the engine power decrease, while the aircraft pitch increased as the altitude remained about the same. They observed the aircraft turn to the north and then it appeared to stall and spin into the ground. The engine power was described as increasing as the aircraft spun. The pilot, age 78, held a private pilot certificate with ratings for airplane single engine land and glider aero tow. His last application for a third class medical certificate was dated September 3, 2009, on which he reported 828 total flight hours and 20 flight hours in the previous six months. The pilot’s logbooks were not located during the investigation. The pilot’s medical records indicated a history of pulmonary embolism. An autopsy of the pilot was conducted by the Regional Forensic Science Center, Sedgwick, Kansas. The cause of death was attributed to multiple blunt force injuries. Post-accident examination of the aircraft by Federal Aviation Inspectors revealed both left and right wings were twisted, struts were bent, and the fabric wing covering was torn. One of the wooden propeller blades was splintered with about one quarter of the blade outboard of the hub remaining. The second blade was mostly intact with about three quarters of the blade remaining and the end splintered. Flight control continuity was verified from all control surfaces to the cockpit controls. Throttle cable continuity was verified from the throttle control to the carburetor. The carburetor responded normally to throttle cable movements. Fuel was found in the carburetor bowl and the fuel filter was found free of contaminants. About one gallon of fuel was found in the fuel tank. No moisture was noted in the fuel. The aircraft was powered by a Rotax 503 engine. No engine anomalies were observed. ## Aircraft - Registration: UNREG (not matched to a registry record) - Reported make and model: CGS HAWK (UNDESIGNAT) - Category: Ultralight - Engines: Rotax 503 reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: William C. Selby - Registered owner: William C. Selby - Airworthiness certificate: Unknown - Departed: 35KS, Derby, KS - Destination: 35KS, Derby, KS - Airport: 35KS, Selby Farm Airport ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 78; injuries: fatal; private; airplane ratings: single-engine land; medical: class 3, without waivers/limitations; seat: single; toxicology performed; flight hours: 828 total ## Weather - Conditions: Visual (VMC), Day - Wind: 240° at 9 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 75 °F, dew point 37 °F - Altimeter: 29.60 inHg - Observed at: IAB, 5 nm away ## Docket (10 files) The files NTSB released with the investigation on December 14, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=75913. 16.1 MB in all. - Toxicological Report (item 1, .PDF, 112 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359412&FileExtension=.PDF&FileName=Toxicological%20Report-Master.PDF - Record of Conversation - Brown and Forbes (item 2, .PDF, 53 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359419&FileExtension=.PDF&FileName=Record%20of%20Conversation%20-%20Brown%20and%20Forbes-Redacted.PDF - Record of Conversation - Stuckey (item 3, .PDF, 52 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359420&FileExtension=.PDF&FileName=Record%20of%20Conversation%20-%20Stuckey-Redacted.PDF - Photo 1 - Wreckage Right Side (item 4, .PDF, 3.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359426&FileExtension=.PDF&FileName=Photo%201%20-%20Wreckage%20Right%20Side-Master.PDF - Photo 2 - Wreckage Rear View (item 5, .PDF, 3.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359430&FileExtension=.PDF&FileName=Photo%202%20-%20Wreckage%20Rear%20View-Master.PDF - Photo 3 - Wreckage Left View (item 6, .PDF, 4.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359431&FileExtension=.PDF&FileName=Photo%203%20-%20Wreckage%20Left%20View-Master.PDF - Photo 4 - Engine (item 7, .PDF, 2.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359432&FileExtension=.PDF&FileName=Photo%204%20-%20Engine-Master.PDF - Maps or Charts of Accident Area, Wreckage Diagrams (item 8, .PDF, 1.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359569&FileExtension=.PDF&FileName=Maps%20or%20Charts%20of%20Accident%20Area,%20Wreckage%20Diagrams-Redacted.PDF - Witness Statements (item 9, .PDF, 1.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359572&FileExtension=.PDF&FileName=Witness%20Statements-Redacted.PDF - Record of Conversation - Balderrama (item 10, .PDF, 52 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359573&FileExtension=.PDF&FileName=Record%20of%20Conversation%20-%20Balderrama-Redacted.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.