# NTSB CEN16LA123: Brockman William A Challenger II, N710WB, Neshkoro, WI, March 12, 2016 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: March 12, 2016, 13:30 local (19:30 UTC) - Place: Neshkoro, WI - Coordinates: 44.001667, -89.200279 - Nearby events: https://openairdocs.org/map.md?lat=44.0017&lon=-89.2003&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Defining event: [Maneuvering-low-alt flying: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report October 6, 2016 - Report: Approved by Office Director - NTSB office: Central Region - Parties: Rotech Flight Safety, FAA Milwaukee FSDO - NTSB case key (mKey): 92835 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN16LA123 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/92835/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=92835 - Page: https://openairdocs.org/ntsb/CEN16LA123 ## Probable cause A total loss of engine power for reasons that could not be determined, as postaccident examination revealed no anomalies that would have precluded normal operation. Contributing to the accident was the non-certificated pilot's decision to maneuver at low altitude. ## 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: [Brockman William A QCU-CHALLENGER II, 1 case](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=056248G), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md) - [Experience/qualifications: qualification/certification](https://openairdocs.org/ntsb-findings/02031010): Personnel issues › Experience/knowledge · Pilot (probable cause); cases with it: [Brockman William A QCU-CHALLENGER II, 1 case](https://openairdocs.org/ntsb-findings/02031010/cases.md?model=056248G), [All aircraft, 280 cases](https://openairdocs.org/ntsb-findings/02031010/cases.md) - [Info processing/decision: decision making/judgment](https://openairdocs.org/ntsb-findings/02041520): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Brockman William A QCU-CHALLENGER II, 1 case](https://openairdocs.org/ntsb-findings/02041520/cases.md?model=056248G), [All aircraft, 3,098 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Maneuvering-low-alt flying: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342) (defining event); cases with it: [Brockman William A QCU-CHALLENGER II, 1 case](https://openairdocs.org/ntsb-events/342/sequence.md?model=056248G), [All aircraft, 1,858 cases](https://openairdocs.org/ntsb-events/342/sequence.md) - [Maneuvering-low-alt flying: Loss of control in flight](https://openairdocs.org/ntsb-events/240); cases with it: [Brockman William A QCU-CHALLENGER II, 1 case](https://openairdocs.org/ntsb-events/240/sequence.md?model=056248G), [All aircraft, 5,002 cases](https://openairdocs.org/ntsb-events/240/sequence.md) - [Maneuvering-low-alt flying: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Brockman William A QCU-CHALLENGER II, 1 case](https://openairdocs.org/ntsb-events/470/sequence.md?model=056248G), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The non-certificated pilot reported that he conducted a low approach over the turf runway at 50 ft above ground level with the engine power at idle. About halfway down the runway, he applied full power, but the engine did not respond. He entered a shallow left turn and slowed the airplane to stall speed before impacting trees. While the condition of the propeller was consistent with the engine having no power at the time of impact, postaccident examination of the airframe and a test run of the engine revealed no anomalies that would have precluded normal operation, and a reason for the loss of power could not be determined. The pilot was not certificated, and he did not hold a medical certificate. The pilot's flight time was unknown. The pilot's decision to maneuver the airplane at a low altitude and low airspeed precluded him from selecting a suitable forced landing site following the loss of engine power. ## Factual narrative On March 12, 2016, about 1330 central standard time, an experimental amateur-built Brockman Challenger II, sustained substantial damage when it impacted trees and landed in a marsh after a reported loss of engine power near Neshkoro, Wisconsin. The non-certificated pilot, the sole occupant, was seriously injured. The airplane was registered to a private individual and operated by the pilot under the provisions of the 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed at the time of the accident and no flight plan was filed. The airplane departed about 1315 from a private grass airstrip located about 3.5 miles north of Neshkoro, Wisconsin. The pilot reported that he was flying for about 15 – 20 minutes and then returned to the grass airstrip. He did a low pass over the runway at 50 ft above ground level (agl) with the power at idle. About 1/2 way down the runway, he applied full throttle but the engine did not respond. He entered a shallow left turn and slowed the airplane to stall speed before hitting 2 trees about 8 ft off the ground. The airplane hit the ground and spun around 180 degrees. The owner of the grass airstrip reported that he was flying his airplane and that he was about 1/4 mile behind the accident airplane approaching the airstrip from the north. He reported that he saw the accident airplane at 150 – 200 ft agl when it turned a left crosswind and then a left downwind. He saw the accident airplane stall into the trees. He stated that the airplane impacted the trees about 15 – 20 degrees nose down with the wings level. The postaccident examination of the airplane revealed that the wreckage was located in a wooded marsh about 470 ft east of the airstrip's midfield point. (There were open fields to the south and west of the airstrip) The left wing was separated from the fuselage and fragmented. The composite left fuel tank separated from the wing but it was intact and fuel was present in the tank. The right wing remained attached to the fuselage but exhibited aft crushing. The fuel tank was intact and contained fuel. The cockpit exhibited extensive crushing and fragmentation. The empennage remained intact. The flight controls exhibited continuity from the flight controls to the control surfaces. The throttle was checked and it operated. The composite 3-bladed propeller remained attached to the reduction pulley and all 3 blades exhibited minimal damage. The leading edge of one blade was partially de-bonded, but there were no leading edge gouges or nicks. The engine was removed from the airframe and shipped to a facility for an engine examination. The examination of the engine was conducted with National Transportation Safety Board oversight. The examination revealed that the spark plugs appeared to be new with the proper gap set. The engine was rotated and compression was good on both cylinders, and drive train continuity was confirmed. The exhaust system was removed and it was ingood condition. The pistons were normal in appearance with no sign of scoring or heat distress. Fuel was found in both carburetor bowls. The fuel jets were the correct size and the carburetors were set correctly. The engine was placed on an engine stand and the engine started. It operated smoothly at idle and at full power. The accident pilot was not certificated. He did not hold a current student pilot certificate and he did not qualify as a sport pilot because he had been denied a medical certificate. He had not taken the practical test for either a sport pilot's or private pilot's certificate. ## Aircraft - Registration: [N710WB](https://openairdocs.org/deregistered/N710WB-2019-02-13), registration cancelled 2019-02-13, S/N CH2-0701-2112, built 2009 (OpenAirDocs) - Reported make and model: BROCKMAN WILLIAM A CHALLENGER II - Registry model: [Brockman William A QCU-CHALLENGER II](https://openairdocs.org/model/brockman-william-a-qcu-challenger-ii) (registry code 056248G) (OpenAirDocs) - Registry engine: [Rotax 582DCDI](https://openairdocs.org/engine/rotax-582dcdi) (registry code 55562, 2 cycle) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: CH2-0701-2112 - Year built: 2009 - Engines: Rotax 582 65 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Ryan Marzahl - Registered owner: Ann L Marzahl - Airworthiness certificate: Special, Experimental (Special) - Departed: None, Neshkoro, WI - Destination: None, Neshkoro, WI - Airport: None, Grass Airstrip, runway 19, 1,300 × 75 ft, grass/turf - Equipment: None ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 49; injuries: serious; seat: front; flight hours: 0 total ## Weather - Conditions: Visual (VMC), Day - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 66 °F, dew point 37 °F - Altimeter: 30.04 inHg - Observed at: Y50, 6 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 20160312002269A](https://openairdocs.org/incident/20160312002269A), Mar 12, 2016: Brockman William A QCU-CHALLENGER II, Neshkoro, WI, Substantial damage. On March 12, 2016 at 1330 CST a Brockman William A Qcu-Challenger II, N710WB, had a forced landing while performing low passes over a privately owned landing… ## Docket (7 files) The files NTSB released with the investigation on June 23, 2016, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=92835. 6.2 MB in all. - NTSB Record of Conversations (item 1, .PDF, 72 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40441587&FileExtension=.PDF&FileName=NTSB%20Record%20of%20Conversations-Master.PDF - Greg Klemp Email (item 2, .PDF, 232 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40441588&FileExtension=.PDF&FileName=Greg%20Klemp%20Email-Master.PDF - Witness Statements from Sheriff's Report (item 3, .PDF, 729 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40441589&FileExtension=.PDF&FileName=Witness%20Statements%20from%20Sheriff%27s%20Report-Master.PDF - Google Map of WI12 Accident Site (item 4, .PDF, 818 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40441590&FileExtension=.PDF&FileName=Google%20Map%20of%20WI12%20Accident%20Site-Master.PDF - Aircraft Information (item 5, .PDF, 451 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40441591&FileExtension=.PDF&FileName=Aircraft%20Information-Master.PDF - NTSB Party Form (item 6, .PDF, 136 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40441592&FileExtension=.PDF&FileName=NTSB%20Party%20Form-Master.PDF - Docket Photos (item 7, .PDF, 10 photos, 3.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40441593&FileExtension=.PDF&FileName=Docket%20Photos-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.