# NTSB WPR22LA171: Cessna 180K, N20640, Portland, OR, April 29, 2022 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: April 29, 2022, 12:30 local (19:30 UTC) - Place: Portland, OR - Coordinates: 45.2533, -122.3542 - Nearby events: https://openairdocs.org/map.md?lat=45.2533&lon=-122.3542&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Runway excursion](https://openairdocs.org/ntsb-events/300) - 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: FAA - NTSB case key (mKey): 105030 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR22LA171 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/105030/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=105030 - Page: https://openairdocs.org/ntsb/WPR22LA171 ## Probable cause The pilot’s failure to maintain directional control during landing on a wet surface with a tailwind, which resulted in a runway excursion. ## 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 180K, 5 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md?model=2072624), [All aircraft, 3,098 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md) - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Cessna 180K, 11 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=2072624), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/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: [Cessna 180K, 8 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=2072624), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md) - [Wind: tailwind](https://openairdocs.org/ntsb-findings/03034015): Environmental issues › Conditions/weather/phenomena · Effect on operation; cases with it: [Cessna 180K, 2 cases](https://openairdocs.org/ntsb-findings/03034015/cases.md?model=2072624), [All aircraft, 594 cases](https://openairdocs.org/ntsb-findings/03034015/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: Runway excursion](https://openairdocs.org/ntsb-events/300) (defining event); cases with it: [Cessna 180K, 7 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=2072624), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) ## Analysis The pilot reported that, he initiated an approach to a private grass airstrip with a 5-knot tailwind. During the landing roll the airplane had limited brake effectiveness as the grass was wet. The airplane subsequently slid off the airstrip and collided with a fence. The right-side elevator was substantially damaged. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. ## Aircraft - Registration: [N20640](https://openairdocs.org/aircraft/N20640), registered now, S/N 18053202, built 1981 (OpenAirDocs) - Reported make and model: CESSNA 180K - Registry model: [Cessna 180K](https://openairdocs.org/model/cessna-180k) (registry code 2072624) (OpenAirDocs) - Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 18053202 - Year built: 1981 - Airframe hours: 21930 - Engines: Continental IO-520-D 300 hp reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Cahoon Neil T - Airworthiness certificate: Standard, Normal - Last inspection: 100 hour, April 5, 2021 - Departed: KSPB, Scapoose, OR - Destination: Same as departure - Airport: None, runway UNK, 600 × 0 ft, grass/turf - Equipment: Stall warning system, Auto-pilot, ADS-B ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 67; injuries: none; airline transport, flight engineer, flight instructor; airplane ratings: multi-engine land, single-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, without waivers/limitations; seat: left; restraint: 4-point; flight hours: 18,000 total, 150 in this make and model, 9,000 as pilot in command, 150 in the last 90 days, 50 in the last 30 days, 2 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 150° at 5 knots - Lowest ceiling: none - Observed at: KSPB, 9 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 20220429006989A](https://openairdocs.org/incident/20220429006989A), Apr 29, 2022: Cessna 180K, Portland, OR, Substantial damage. Airplane conducted soft field landing on private airstrip. During rollout Airplane contacted fence causing substantial damage to the aircraft. ## Docket (2 files) The files NTSB released with the investigation on September 22, 2022, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=105030. 2.4 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 11 pages, 2.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14431770&FileExtension=pdf&FileName=WPR22LA171_6120_flat_Redacted-Rel.pdf - Photo (item 2, PDF, 1 page, 1 photo, 303 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14432017&FileExtension=pdf&FileName=WPR22LA171photopdf-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.