# NTSB CEN18LA239: Sibila MH-1, N32KS, Beach City, OH, June 25, 2018 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: June 25, 2018, 09:30 local (13:30 UTC) - Place: Beach City, OH - Coordinates: 40.646389, -81.555831 - Nearby events: https://openairdocs.org/map.md?lat=40.6464&lon=-81.5558&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Defining event: [Approach-VFR pattern downwind: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report November 19, 2019 - Report: Approved by Office Director - NTSB office: Central Region - Parties: Columbus FSDO - NTSB case key (mKey): 97566 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN18LA239 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/97566/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=97566 - Page: https://openairdocs.org/ntsb/CEN18LA239 ## Probable cause The total loss of engine power for reasons that could not be determined based on the available evidence. ## 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: [Kevin L Sibila MH1, 1 case](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=05636GK), [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; cases with it: [Kevin L Sibila MH1, 1 case](https://openairdocs.org/ntsb-findings/02031010/cases.md?model=05636GK), [All aircraft, 280 cases](https://openairdocs.org/ntsb-findings/02031010/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Approach-VFR pattern downwind: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) (defining event); cases with it: [Kevin L Sibila MH1, 1 case](https://openairdocs.org/ntsb-events/341/sequence.md?model=05636GK), [All aircraft, 3,820 cases](https://openairdocs.org/ntsb-events/341/sequence.md) - [Autorotation: Hard landing](https://openairdocs.org/ntsb-events/092); cases with it: [Kevin L Sibila MH1, 1 case](https://openairdocs.org/ntsb-events/092/sequence.md?model=05636GK), [All aircraft, 2,102 cases](https://openairdocs.org/ntsb-events/092/sequence.md) ## Analysis The private pilot, who did not hold a rotorcraft rating, reported that he departed on a maintenance flight to track and balance the experimental, amateur-built helicopter's main rotor. As he was making the approach to land, the helicopter was about 40 ft above ground level when the engine lost total power with no warning. He entered an autorotation for the forced landing, but within seconds the helicopter impacted terrain, the skids collapsed, and it rolled on its side. A postaccident engine run/test was conducted, and the engine started with no hesitation; however, the run time was limited due to damaged cooling fans. The postaccident examination of the airframe and engine revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation. Thus, the reason for the total loss of engine power could not be determined. ## Factual narrative On June 25, 2018, about 0830 eastern daylight time, an experimental amateur-built Sibila MH1 helicopter, N32KS, impacted terrain during a forced landing near Beach City, Ohio. The pilot received serious injuries; and the helicopter sustained substantial damage. The helicopter was owned and operated by an individual under the provisions of Title 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed at the time of the flight, which was not on a flight plan. The helicopter departed about 0825 from Beach City Airport (2D7), Beach City, Ohio, on a local flight. The pilot reported that he departed on a maintenance flight to track and balance the helicopter's main rotor. He made several flights to make adjustments to the main rotor. On the last flight, he was making the approach to land and he was about 40 ft above ground level (agl) when the engine "completely shut down" without any warning. He entered an autorotation for the forced landing, but within seconds the helicopter impacted the terrain, the skids collapsed, and it rolled on its side. The owner and builder of the helicopter witnessed the accident and was located about 3,000 ft from the accident site. He stated the helicopter appeared to be about 20 to 30 ft agl and he thought the pilot planned to turn toward the runway. Then the helicopter appeared to enter a steady descent until ground contact. When he arrived at the accident site, the helicopter pilot told him that the engine just "quit." The examination of the helicopter revealed that all three carburetors were dislodged from the intake manifold. The outer two clamps of the intake manifold appeared to be loose, and there were no threads protruding through the outboard clamps. The third intake manifold clamp was found at the initial impact area, and the clamp appeared to be tight in reference to the threads protruding through the clamp nut. The engine was a 3-cylinder Yamaha Genesis 120-horsepower engine that was originally designed to be used in snowmobiles. It was a 3 carburetor 4-stroke engine with slaved carburetors with dual electrical fuel pumps. It was a rebuilt zero-time engine and it had 9.1 hours on the hour meter at the time of the accident. The engine was prepared for an engine run/test, including re-installing the intake manifold and tightening all the clamps. Full throttle travel was checked, and the fuel pumps were turned on and it was confirmed that there were no fuel leaks. The engine started with no hesitation, but the run time was limited due to damaged cooling fans. After the second engine run, the outboard intake manifold clamps were loosened to the point were no threads protruded through the clamp, but the center clamp was left in the tightened position. The carburetor assembly was forcefully pushed and pulled but the induction system did not come loose from the intake manifold. The pilot reported that he held a private pilot's certificate with single-engine,multi-engine, and airplane instrument ratings. He did not hold a rotorcraft rating. He had 3,200 total flight hours with 260 hours in the make and model of the accident helicopter. He stated that he received helicopter training in a Bell 47 and had received autorotation training and had practiced autorototions and sliding landings. The pilot reported that as a distributor for the experimental, amateur built helicopter, he typically flew the maintenance flights to track and balance the main rotor system of the new amateur-built helicopters. ## Aircraft - Registration: [N32KS](https://openairdocs.org/deregistered/N32KS-2020-04-07), registration cancelled 2020-04-07, S/N MH12014-01, built 2017 (OpenAirDocs) - Reported make and model: SIBILA MH-1 - Registry model: [Kevin L Sibila MH1](https://openairdocs.org/model/kevin-l-sibila-mh1) (registry code 05636GK) (OpenAirDocs) - Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs) - Category: Helicopter, amateur-built - Serial number: MH12014-01 - Year built: 2017 - Airframe hours: 8 - Engines: Yamaha Genesis 120 120 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Condition, March 27, 2018 - Departed: 2D7, Beach City, OH - Destination: 2D7, Beach City, OH - Airport: 2D7, Beach City Airport, runway 10, 3,175 × 115 ft - Equipment: None ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 67; injuries: serious; private; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3; seat: single; flight hours: 3,200 total, 260 in this make and model, 20 in the last 90 days, 10 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 40° at 7 knots - Visibility: 8 statute miles - Lowest ceiling: 1,300 ft broken - Temperature: 64 °F, dew point 59 °F - Altimeter: 30.15 inHg - Observed at: CAK, 18 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 20180625008569A](https://openairdocs.org/incident/20180625008569A), Jun 25, 2018: Kevin L Sibila MH1, Beach City, OH, Substantial damage. Pilot was balancing the rotor system in forward flight transitioning to a hover at 40 feet and the engine quit. Operations inspector has initiated eir as… ## Docket (6 files) The files NTSB released with the investigation on September 4, 2019, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=97566. 2.0 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 637 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40475476&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 - Sibila (item 2, .PDF, 678 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40475477&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1%20-%20Sibila-Master.PDF - NTSB Record of Conversations (item 3, .PDF, 73 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40475478&FileExtension=.PDF&FileName=NTSB%20Record%20of%20Conversations-Master.PDF - Haines - Sibila Statement (item 4, .PDF, 228 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40475479&FileExtension=.PDF&FileName=Haines%20-%20Sibila%20Statement-Master.PDF - FAA Inspector Statement (item 5, .PDF, 359 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40475480&FileExtension=.PDF&FileName=FAA%20Inspector%20Statement-Master.PDF - NTSB Wreckage Release (item 6, .PDF, 48 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40475481&FileExtension=.PDF&FileName=NTSB%20Wreckage%20Release-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.