# NTSB WPR24LA203: Joseph H Mason Bearhawk Patrol, N357MB, Twin Falls, ID, June 18, 2024

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: June 18, 2024, 09:24 local (15:24 UTC)
- Place: Twin Falls, ID · Joslin Field / Magic Valley Regional Airport
- Coordinates: 42.481809, -114.48773
- Nearby events: https://openairdocs.org/map.md?lat=42.4818&lon=-114.4877&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Western Pacific Region
- Parties: Federal Aviation Administration
- NTSB case key (mKey): 194535
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR24LA203
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/194535/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=194535
- Page: https://openairdocs.org/ntsb/WPR24LA203

## Probable cause

The pilot’s failure to maintain directional control during the landing roll.

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Use of equip/info: use of equip/system](https://openairdocs.org/ntsb-findings/02063015): Personnel issues › Task performance · Pilot; cases with it: [Joseph H Mason BEARHAWK PATROL, 1 case](https://openairdocs.org/ntsb-findings/02063015/cases.md?model=05640FK), [All aircraft, 1,391 cases](https://openairdocs.org/ntsb-findings/02063015/cases.md)
- [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Joseph H Mason BEARHAWK PATROL, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=05640FK), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md)

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Joseph H Mason BEARHAWK PATROL, 1 case](https://openairdocs.org/ntsb-events/230/sequence.md?model=05640FK), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md)

## Analysis

The pilot of the tailwheel-equipped airplane reported that during landing, shortly after touchdown, the airplane veered left. The pilot initially applied right rudder input, and when the airplane yawed right, he then attempted to counter with left rudder input. Subsequently, the airplane ground looped to the right and the left wing impacted the runway, resulting in substantial damage. The pilot reported there were no preaccident mechanical malfunctions that precluded normal operation. At the time of the accident, the pilot was landing on runway 26 with wind from 270° at 7 knots.

## Aircraft

- Registration: [N357MB](https://openairdocs.org/aircraft/N357MB), registered now, S/N 57P-123P/124P-P377, built 2022 (OpenAirDocs)
- Reported make and model: JOSEPH H MASON BEARHAWK PATROL
- Registry model: [Joseph H Mason BEARHAWK PATROL](https://openairdocs.org/model/joseph-h-mason-bearhawk-patrol) (registry code 05640FK) (OpenAirDocs)
- Registry engine: [Aerosport O-375-A1A](https://openairdocs.org/engine/aerosport-o-375-a1a) (registry code 01499, reciprocating) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 57P-123P/124P-P377
- Year built: 2022
- Airframe hours: 99.8
- Engines: AEROSPORT O-375-A1A 205 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Condition, January 18, 2024, 20.7 hours before
- Airport: TWF, Joslin Fld/Magic Valley Rgnl, runway 08/26, 8,704 × 150 ft, asphalt
- Equipment: Electronic primary flight display, Electronic multifunction display, Angle of attack indicator, ADS-B

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 71; injuries: none; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: basicmed, with waivers/limitations; last flight review February 24, 2024; seat: center; flight hours: 1,749 total, 18 in this make and model, 1,749 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: 260° at 6 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 52 °F, dew point 28 °F
- Altimeter: 30.07 inHg
- Observed at: KTWF, 1 nm away
- METAR: KTWF 181453Z 26006KT 10SM CLR 11/M02 A3007 RMK AO2 SLP157 T01111017 53011

## 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 20240618012679A](https://openairdocs.org/incident/20240618012679A), Jun 18, 2024: Joseph H Mason BEARHAWK PATROL, Twin Falls, ID, Substantial damage. Pilot landed and on rollout ground looped and damaged the left wing.

## Docket (2 files)

The files NTSB released with the investigation on February 12, 2025, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=194535. 3.2 MB in all.

- Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 2.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17531892&FileExtension=pdf&FileName=6120%20back%20to%20pilot_Redacted-Rel.pdf
- Photos (item 2, PDF, 1 page, 495 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17534119&FileExtension=pdf&FileName=Photo%20WPR24LA203%20Twin%20Falls,%20ID%20N357MB-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.

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