# NTSB ERA25LA043: Cessna 310K, N143MG, Alcoa, TN, November 9, 2024 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: November 9, 2024, 11:04 local (16:04 UTC) - Place: Alcoa, TN · Off runway - Coordinates: 35.811091, -83.994067 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=35.8111&lon=-83.9941&mi=10 - Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping) - Defining event: [Taxi-from runway: 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: Eastern Region Aviation - Parties: FAA/FSDO - NTSB case key (mKey): 195478 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ERA25LA043 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/195478/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=195478 - Page: https://openairdocs.org/ntsb/ERA25LA043 ## Probable cause The failure of the left engine throttle control shaft bushing during taxi, resulting in a full asymmetric power condition and a taxiway excursion. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Engine fuel and control: fuel control/carburetor](https://openairdocs.org/ntsb-findings/01057322): Aircraft › Aircraft power plant · Fatigue/wear/corrosion (probable cause); cases with it: [Cessna 310K, 2 cases](https://openairdocs.org/ntsb-findings/01057322/cases.md?model=2074228), [All aircraft, 195 cases](https://openairdocs.org/ntsb-findings/01057322/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Taxi-from runway: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Cessna 310K, 2 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=2074228), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Taxi: Ground collision](https://openairdocs.org/ntsb-events/200); cases with it: [Cessna 310K, 1 case](https://openairdocs.org/ntsb-events/200/sequence.md?model=2074228), [All aircraft, 618 cases](https://openairdocs.org/ntsb-events/200/sequence.md) ## Analysis The pilot reported that his approach and landing were normal. After exiting the runway, while on a taxiway, the airplane “swerved to the right and seemed to accelerate.” Unable to control braking and steering, the airplane departed the taxiway to the right and proceeded through a steep depression before colliding with a wind sensor pole. The pilot secured the airplane and was met by first responders. The airplane’s right wing and fuselage were substantially damaged during the accident sequence. Postaccident examination of the airplane revealed that the brass splined bushing on the left engine throttle control shaft was stripped, which resulted in an uncontrollable, full power application to that engine. The wheel brakes were examined and no anomalies were found; the brakes held the airplane in place with the left engine at full power during a test run. ## Aircraft - Registration: [N143MG](https://openairdocs.org/aircraft/N143MG), registered now, S/N 310K0134 (OpenAirDocs) - Reported make and model: CESSNA 310K - Registry model: [Cessna 310K](https://openairdocs.org/model/cessna-310k) (registry code 2074228) (OpenAirDocs) - Registry engine: [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series) (registry code 17027, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 310K0134 - Year built: 1965 - Airframe hours: 4588 - Engines: CONT MOTOR IO-470-VO(9) 260 horsepower reciprocating; CONT MOTOR IO-470-VO(8) 260 horsepower reciprocating - Damage: Substantial damage - Flight: Business, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, May 2, 2024 - Departed: H10, St Louis, MO - Destination: Same as departure - Flight plan: IFR - Airport: TYS, McGhee Tyson Airport, runway 5L, 10,000 × 150 ft, concrete - Equipment: Auto-pilot, Stall warning system, ADS-B ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 79; injuries: none; flight instructor, airline transport, commercial, private; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review February 15, 2024; seat: left; restraint: lap only; flight hours: 18,400 total, 4,000 in this make and model, 16,000 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Wind: 50° at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 64 °F, dew point 50 °F - Altimeter: 30.18 inHg - Observed at: TYS, 1 nm away - METAR: KTYS 091553Z 05006KT 10SM CLR 18/10 A3018 RMK AO2 SLP216 T01830094 $ ## 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 20241109017389A](https://openairdocs.org/incident/20241109017389A), Nov 9, 2024: Cessna 310K, Knoxville, TN, Substantial damage. The aircraft had a normal landing on runway 05L at ktys. Upon applying brakes, the pilot stated he noticed difficulty in steering the aircraft and that braking… ## Docket (5 files) The files NTSB released with the investigation on April 22, 2025, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=195478. 19.9 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 10 pages, 4.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18246032&FileExtension=pdf&FileName=1%206120_Redacted-Rel.pdf - Excerpts - FAA inspector statements and photos (item 2, PDF, 28 pages, 10.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18258273&FileExtension=pdf&FileName=2%20Excerpts%20-%20FAA%20Inspector%20Statements%20with%20Photos_Redacted-Rel.pdf - NTSB memorandum of record - pilot information provided by FAA (item 3, PDF, 1 page, 117 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18246577&FileExtension=pdf&FileName=2a%20NTSB%20MOR%20FAA%20Gordon_Redacted-Rel.pdf - Excerpts - airframe logbook (item 4, PDF, 1 page, 2.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18246166&FileExtension=pdf&FileName=3%20Excerpts%20-%20Airframe%20Logbook_Redacted-Rel.pdf - Excerpts - engine logbooks (item 5, PDF, 1 page, 2.0 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18246499&FileExtension=pdf&FileName=4%20Excerpts%20-%20Engine%20Logbooks_Redacted-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.