# NTSB ANC23LA086: Cessna 182K, N2586R, Trimble River Valley, AK, September 24, 2023 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: September 24, 2023, 09:30 local (17:30 UTC) - Place: Trimble River Valley, AK - Coordinates: 61.77516, -152.15263 - Nearby events: https://openairdocs.org/map.md?lat=61.7752&lon=-152.1526&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470) - 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: Alaska Regional Office - Parties: FAA/FSDO - NTSB case key (mKey): 193153 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC23LA086 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/193153/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=193153 - Page: https://openairdocs.org/ntsb/ANC23LA086 ## Probable cause The pilot’s selection of unsuitable terrain for landing, which resulted in the left main landing gear (MLG) tire impacting a rock, resulting in the separation of the MLG wheel, and the subsequent loss of directional control. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Info processing/decision: decision making/judgment](https://openairdocs.org/ntsb-findings/02041520): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Cessna 182K, 5 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md?model=2072724), [All aircraft, 3,098 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md) - [Runway/land/takeoff/taxi surface](https://openairdocs.org/ntsb-findings/03023000): Environmental issues › Physical environment · Decision related to condition (probable cause); cases with it: [Cessna 182K, 1 case](https://openairdocs.org/ntsb-findings/03023000/cases.md?model=2072724), [All aircraft, 253 cases](https://openairdocs.org/ntsb-findings/03023000/cases.md) - [Object/animal/substance: debris/dirt/foreign object](https://openairdocs.org/ntsb-findings/03022055): Environmental issues › Physical environment · Effect on operation; cases with it: [Cessna 182K, 1 case](https://openairdocs.org/ntsb-findings/03022055/cases.md?model=2072724), [All aircraft, 101 cases](https://openairdocs.org/ntsb-findings/03022055/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: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470) (defining event); cases with it: [Cessna 182K, 6 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=2072724), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) - [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230); cases with it: [Cessna 182K, 6 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=2072724), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) ## Analysis The pilot reported that he was landing at a remote off airport site. After touchdown, the left main landing gear contacted a large rock resulting in the left wheel separating from the main landing gear. Subsequently, the airplane veered left, nosed down, and both wings struck the ground resulting in substantial damage. The pilot reported that there were no pre-accident mechanical failures or malfunctions with the airplane that would have precluded normal operation. ## Aircraft - Registration: [N2586R](https://openairdocs.org/deregistered/N2586R-2026-09-09), registration cancelled 2026-09-09, S/N 18258286, built 1967 (OpenAirDocs) - Reported make and model: CESSNA 182K - Registry model: [Cessna 182K](https://openairdocs.org/model/cessna-182k) (registry code 2072724) (OpenAirDocs) - Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 18258286 - Year built: 1967 - Engines: Continental O-470R25 230 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Departed: Lower Trimble River Valley, AK - Destination: Same as departure - Airport: Trimble River, runway N/A, 1,200 × 50 ft, gravel - Equipment: Stall warning system ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 50; injuries: none; airline transport, flight engineer; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, with waivers/limitations; last flight review April 21, 2023; seat: left; restraint: 3-point; flight hours: 18,500 total, 400 in this make and model, 13,500 as pilot in command, 120 in the last 90 days, 45 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 45 °F, dew point 37 °F - Altimeter: 29.79 inHg - Observed at: PAWS, 75 nm away - METAR: PAWS 241756Z AUTO 00000KT 10SM CLR 07/03 A2979 RMK AO2 SLP094 T00670033 10067 20033 53010 ## 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 20230924015099A](https://openairdocs.org/incident/20230924015099A), Sep 24, 2023: Cessna C182, Skwentna, AK, Substantial damage. Left main gear struck rock while landing on strip in trimble river valley, causing aircraft to lean and recieve right wing and prop damage. ## Docket (2 files) The files NTSB released with the investigation on April 4, 2024, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=193153. 2.9 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 11 pages, 2.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16212930&FileExtension=pdf&FileName=NTSB%206120_Redacted-Rel.pdf - Photos (item 2, PDF, 3 pages, 776 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16186985&FileExtension=pdf&FileName=ANC23LA086%20Photos-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.