# NTSB WPR20CA274: Uskoski Ridge Runner IV, N11752, Vancouver, WA, August 14, 2020

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Class 4 · Data collection · Final report
- Date: August 14, 2020, 09:05 local (16:05 UTC)
- Place: Vancouver, WA
- Coordinates: 45.715278, -122.50805 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.7153&lon=-122.5080&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Defining event: [Maneuvering-low-alt flying: Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed
- Report: Approved by Office Director
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Western Pacific Region
- NTSB case key (mKey): 101818
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR20CA274
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/101818/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=101818
- Page: https://openairdocs.org/ntsb/WPR20CA274

## Probable cause

The pilot’s failure to maintain airplane control while maneuvering to land which resulted in an aerodynamic stall at a low altitude, which the pilot was unable to recover from.

## Findings

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

- [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Neal E Uskoski RIDGE RUNNER IV, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=056351R), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md)
- [Performance/control parameters: airspeed](https://openairdocs.org/ntsb-findings/01062010): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Neal E Uskoski RIDGE RUNNER IV, 1 case](https://openairdocs.org/ntsb-findings/01062010/cases.md?model=056351R), [All aircraft, 1,681 cases](https://openairdocs.org/ntsb-findings/01062010/cases.md)
- [Performance/control parameters: angle of attack](https://openairdocs.org/ntsb-findings/01062042): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Neal E Uskoski RIDGE RUNNER IV, 1 case](https://openairdocs.org/ntsb-findings/01062042/cases.md?model=056351R), [All aircraft, 990 cases](https://openairdocs.org/ntsb-findings/01062042/cases.md)

## Sequence of events

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

- [Maneuvering-low-alt flying: Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241) (defining event); cases with it: [Neal E Uskoski RIDGE RUNNER IV, 1 case](https://openairdocs.org/ntsb-events/241/sequence.md?model=056351R), [All aircraft, 1,529 cases](https://openairdocs.org/ntsb-events/241/sequence.md)

## Analysis

The student pilot reported that while maneuvering to land on a private grass strip, the left wing stalled. The airplane subsequently impacted the ground and cartwheeled. The wings and fuselage were substantially damaged. The pilot reported that there were no preimpact mechanical failures or malfunctions with the airplane that would have precluded normal operation.

## Aircraft

- Registration: [N11752](https://openairdocs.org/deregistered/N11752-2021-06-05), registration cancelled 2021-06-05, S/N 752 (OpenAirDocs)
- Reported make and model: Uskoski Ridge Runner IV
- Registry model: [Neal E Uskoski RIDGE RUNNER IV](https://openairdocs.org/model/neal-e-uskoski-ridge-runner-iv) (registry code 056351R) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 752
- Year built: 2010
- Engines: Yamaha RX1 140 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: None
- Departed: Brush Prairie, WA
- Equipment: None

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 68; injuries: minor; student; seat: left; restraint: 4-point; flight hours: 20 total, 20 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: 310° at 3 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 61 °F, dew point 48 °F
- Altimeter: 30.18 inHg
- Observed at: KPDX, 3 nm away
- METAR: KPDX 190853Z 20015KT 10SM -RA SCT018 BKN049 OVC060 11/09 A3021 RMK AO2 RAB02 SLP230 P0000 60000 T01110094 52037

## 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 20200814012769A](https://openairdocs.org/incident/20200814012769A), Aug 14, 2020: Neal E Uskoski RIDGE RUNNER IV, Brush Prairie, WA, Substantial damage. As reported by the pilot, Friday morning was calm. It was planned to do a couple full power checks, bring the plane off the ground a few feet. When the pilot…

## Docket (2 files)

The files NTSB released with the investigation on July 26, 2021, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=101818. 3.1 MB in all.

- Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 1.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=11776248&FileExtension=pdf&FileName=NTSB%206120_Redacted-Rel.pdf
- Accident pictures (item 2, PDF, 1 page, 1.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=11772594&FileExtension=pdf&FileName=WPR20CA274%20Accident%20Pictures%202_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.

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