# NTSB CHI08LA190: de Havilland DHC-6-200, N203SF, Baldwin, WI, June 29, 2008 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: June 29, 2008, 12:50 local (17:50 UTC) - Place: Baldwin, WI - Coordinates: 44.966388, -92.387779 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=44.9664&lon=-92.3878&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Defining event: [Maneuvering: Flight control sys malf/fail](https://openairdocs.org/ntsb-events/333) - Highest injury: No injuries - Injuries: 15 uninjured - Status: Completed, report September 10, 2009 - Report: Approved by Office Director - Parties: Viking Air Limited, Transportation Safety Board of Canada, Federal Aviation Administration - NTSB case key (mKey): 68442 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI08LA190 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/68442/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=68442 - Page: https://openairdocs.org/ntsb/CHI08LA190 ## Probable cause Undetermined. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [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. - [Maneuvering: Flight control sys malf/fail](https://openairdocs.org/ntsb-events/333) (defining event); cases with it: [All aircraft, 410 cases](https://openairdocs.org/ntsb-events/333/sequence.md) ## Analysis The pilot reported that there were no observed anomalies with the left wing prior to the flight. During the flight, which was conducted as a local parachute operation, the pilot performed a descending turn. The left wing's aileron bound when the pilot attempted to level the bank. The pilot declared an emergency. The pilot and a passenger were able to exert enough force to the control wheel to regain control of the airplane and land safely. An on-scene examination of the airplane revealed damage to the left wing flap and aileron consistent with an overload event; however, the investigation could not definitively pinpoint the cause of the damage. ## Factual narrative On June 29, 2008, about 1250 central daylight time, a de Havilland DHC-6-200, N203SF, owned by Desert Sand Aircraft Leasing Company Inc., piloted by an airline transport rated pilot, sustained substantial damage during descent when the airplane's flight controls bound near Baldwin, Wisconsin. The pilot declared an emergency. The pilot and 14 parachutists departed on the parachute operations flight. Twelve parachutists exited the airplane before the incident. The pilot and two remaining parachutists reported no injuries. The flight was operating under 14 Code of Federal Regulations Part 91 with no flight plan filed. Visual meteorological conditions prevailed. The local flight originated from Baldwin Airport, near Baldwin, Wisconsin, about 1240. The pilot's reported he had initiated an idle power, descending tight right turn to a heading of 090 degrees. The airspeed before the turn was approximately 70 KIAS [knots indicated airspeed] and at rollout less than 100 KIAS, which was below the maneuvering speed of 126 KIAS. During the roll out, the ailerons where effortlessly brought to about 7/8 of full left travel at which point it felt like some part went "over top dead center." The pilot made an immediate full force attempt to bring the ailerons back to neutral but failed. The pilot said that a lot of play was apparent in the aileron controls. With full right force on the yoke, the plane appeared to not roll left. The passenger in the copilot seat was told that a problem existed and was asked to help push the wheel down on the right. The combined effort allowed for a non-rolling flight. Throughout these attempts to control the roll, the nose down attitude was sustained. Elevator control was not affected, but bringing the nose up raised the concern of inducing a left hand roll. Before reaching approximately 4,000 feet mean sea level (MSL), 3,000 feet above ground level (AGL) the pilot raised the nose of the airplane. Subsequently, the aircraft started to roll left. A maximum force input did not level the wings. As the aircraft reached 90 degrees of left bank, another more concerted attempt at controlling the aircraft was initiated. With the airspeed slowed, full power on the left engine, full right rudder, and full force right aileron input, the pilot was able to establish nearly wings level, straight flight. The pilot made "mayday" calls, which were relayed by another airplane. The airplane diverted to Saint Paul, Minnesota. The passenger in the copilot’s seat, unable to no longer provide physical input to help maintain control, was replaced by one of the parachutists sitting in the back of the airplane. Once the parachutist was in the seat, the pilot asked him to "give it all you've got." His input together with the pilots’ brought the ailerons back to neutral. The pilot stated that there were no observed anomalies with the airplane prior to the flight. An examination of the airplane on-scene, to include the aileron and flap systems, showed damageconsistent with an in-flight overload. ## Aircraft - Registration: N203SF (not matched to a registry record) - Reported make and model: de Havilland DHC-6-200 - Category: Airplane - Serial number: 151 - Airframe hours: 31714 - Engines: Pratt & Whitney Canada PT6A-27 625 horsepower turbo prop; Pratt & Whitney Canada PT6A-27 625 horsepower turbo prop - Damage: Substantial damage - Flight: Skydiving, Part 91 - Operator: Marko Bewersdorff - Registered owner: Desert Sand Aircraft Leasing Company Inc. - Airworthiness certificate: Standard, Normal - Last inspection: AAIP, October 1, 2007 - Departed: WI14, Baldwin, WI - Airport: WI14, Baldwin ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 40; injuries: none; flight instructor, airline transport, commercial; airplane ratings: multi-engine land, single-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; seat: left; flight hours: 4,187 total, 750 in this make and model, 4,000 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Wind: 350° at 11 knots, gusting 22 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 70 °F, dew point 50 °F - Altimeter: 29.94 inHg - Observed at: RHN, 7 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 20080629843699A](https://openairdocs.org/incident/20080629843699A), Jun 29, 2008: Dhav DHC6200, Baldwin, WI, Minor damage. (-23) The aircraft experienced an aileron malfunction after transporting skydivers while rolling out of a descending right turn causing aerodynamic damage to… ## Docket (3 files) The files NTSB released with the investigation on July 17, 2009, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=68442. 703 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 615 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40310917&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Pilot Statement (item 2, .PDF, 44 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40310918&FileExtension=.PDF&FileName=Pilot%20Statement-Master.PDF - Record of Interview (item 3, .PDF, 43 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40310919&FileExtension=.PDF&FileName=Record%20of%20Interview-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.