# NTSB CEN23LA296: Magni M24, N123PS, Mineral Point, MO, July 11, 2023 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Class 3 · Limited · Final report - Date: July 11, 2023, 17:50 local (22:50 UTC) - Place: Mineral Point, MO - Coordinates: 37.922718, -90.731959 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=37.9227&lon=-90.7320&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Defining event: [Approach-VFR pattern base: Part(s) separation from AC](https://openairdocs.org/ntsb-events/338) - Highest injury: Minor injuries - Injuries: 2 minor - Status: Completed - Report: Approved by Office Director - Investigation class: Class 3 - NTSB office: Central Region - Parties: FAA FSDO - NTSB case key (mKey): 192608 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN23LA296 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/192608/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=192608 - Page: https://openairdocs.org/ntsb/CEN23LA296 ## Probable cause The inflight loss of the engine’s air filter which collided with the propeller which resulted in a vibration. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Engine (reciprocating)](https://openairdocs.org/ntsb-findings/01058500): Aircraft › Aircraft power plant · Inadequate inspection (probable cause); cases with it: [Jeffery Dean Houseman MAGNI M24, 1 case](https://openairdocs.org/ntsb-findings/01058500/cases.md?model=05637RI), [All aircraft, 497 cases](https://openairdocs.org/ntsb-findings/01058500/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 base: Part(s) separation from AC](https://openairdocs.org/ntsb-events/338) (defining event); cases with it: [Jeffery Dean Houseman MAGNI M24, 1 case](https://openairdocs.org/ntsb-events/338/sequence.md?model=05637RI), [All aircraft, 563 cases](https://openairdocs.org/ntsb-events/338/sequence.md) - [Landing: Off-field or emergency landing](https://openairdocs.org/ntsb-events/440); cases with it: [Jeffery Dean Houseman MAGNI M24, 1 case](https://openairdocs.org/ntsb-events/440/sequence.md?model=05637RI), [All aircraft, 3,365 cases](https://openairdocs.org/ntsb-events/440/sequence.md) - [Landing-flare/touchdown: Collision during takeoff/land](https://openairdocs.org/ntsb-events/490); cases with it: [Jeffery Dean Houseman MAGNI M24, 1 case](https://openairdocs.org/ntsb-events/490/sequence.md?model=05637RI), [All aircraft, 1,309 cases](https://openairdocs.org/ntsb-events/490/sequence.md) ## Analysis While on the downwind leg of the airport traffic pattern, the pilot heard a noise from the engine or the rotor and felt the gyroplane momentarily “shudder.” The pilot performed a precautionary landing and the gyroplane touched down hard, bounced, and rolled on its right side. The gyroplane sustained substantial damage to the main rotor and fuselage. A postaccident examination of the gyroplane revealed that the air filter, which is mounted to the engine, was not located at the accident site. It is likely that the air filter separated from the gyroplane which resulted in the shudder felt by the pilot. An examination of the gyroplane and engine revealed no other anomalies that would have precluded normal operations. ## Factual narrative On July 11, 2023, about 1800 central daylight time, a Magni M24 gyroplane, N123PS, was substantially damaged when it was involved in an accident near Mineral Point, Missouri. The pilot and passenger received minor injuries. The gyroplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot reported that, while on the downwind leg of the airport traffic pattern, he heard a noise from engine or rotor felt a momentary “shudder.” The pilot performed a precautionary landing to a field. During the landing, the gyroplane touched down hard, bounced, and rolled on its right side. The gyroplane sustained substantial damage to the main rotor and fuselage. A postaccident examination of the gyroplane revealed that the air filter, which is mounted to the engine, was not located at the accident site. No other anomalies were detected with the airframe or engine when examined by the Federal Aviation Administration. Following the accident, the pilot returned to the accident site and conducted a grid-search to locate the air filter. Unable to locate it, he thought the air filter likely came loose and departed the gyroplane on the downwind leg, which struck the propeller and would have produced the loud noise and brief shudder that he encountered. ## Aircraft - Registration: [N123PS](https://openairdocs.org/aircraft/N123PS), registered now, S/N 24181214, built 2018 (OpenAirDocs) - Reported make and model: MAGNI M24 - Registry model: [Jeffery Dean Houseman MAGNI M24](https://openairdocs.org/model/jeffery-dean-houseman-magni-m24) (registry code 05637RI) (OpenAirDocs) - Registry engine: [Rotax 914UL](https://openairdocs.org/engine/rotax-914ul) (registry code 55553, 4 cycle) (OpenAirDocs) - Category: Gyroplane, amateur-built - Serial number: 24181214 - Year built: 2018 - Airframe hours: 393.2 - Engines: ROTAX 914UL 115 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Brian Bell - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Annual, February 5, 2023, 40 hours before - Airport: 8WC, Washington County - Equipment: ADS-B ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 67; injuries: minor; sport pilot; airplane ratings: single-engine sea; medical: sport pilot; last flight review July 11, 2023; seat: left; restraint: lap only; flight hours: 767 total, 16 in this make and model, 716 as pilot in command, 102 in the last 90 days, 8 in the last 30 days, 4 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 170° at 5 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 90 °F, dew point 59 °F - Altimeter: 29.95 inHg - Observed at: KFAM, 17 nm away - METAR: KFAM 112256Z AUTO 17005KT 10SM CLR 32/15 A2995 RMK AO2 SLP140 T03220150 ## 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 20230711014939A](https://openairdocs.org/incident/20230711014939A), Jul 11, 2023: Jeffery Dean Houseman MAGNI M24, Mineral Point, MO, Substantial damage. On July 11, 2023 at approximately 1700L, the aircraft was flying the pattern at Washington County Airport (8WC) with the PIC and one passenger. The takeoff was… ## Docket (4 files) The files NTSB released with the investigation on November 7, 2024, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=192608. 7.3 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 11 pages, 5.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16829159&FileExtension=pdf&FileName=cen23la296%20NTSB%20Form%206120_Redacted-Rel.pdf - Record of conversation pilot (item 2, PDF, 1 page, 63 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16829169&FileExtension=pdf&FileName=ROC%20Pilot%20Owner-Rel.pdf - Photos (item 3, PDF, 3 pages, 2 photos, 1.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16852620&FileExtension=pdf&FileName=Photos%202_Redacted-Rel.pdf - Memo for record (item 4, PDF, 1 page, 65 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17823900&FileExtension=pdf&FileName=MFR%20Case%20details-Rel.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.