# NTSB WPR21LA162: Thrush S2R-T660, N51080, Hermiston, OR, April 17, 2021

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: April 17, 2021, 14:00 local (21:00 UTC)
- Place: Hermiston, OR
- Coordinates: 45.828222, -119.25916 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.8282&lon=-119.2592&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Defining event: [Takeoff: Landing gear collapse](https://openairdocs.org/ntsb-events/094)
- 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): 102936
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR21LA162
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/102936/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=102936
- Page: https://openairdocs.org/ntsb/WPR21LA162

## Probable cause

The pilot’s loss of directional control due to a blown tire, which resulted in a runway excursion and impact with terrain.

## Findings

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

- [Landing gear system: tire casing](https://openairdocs.org/ntsb-findings/01023244): Aircraft › Aircraft systems · Failure (probable cause); cases with it: [Thrush S2R-T660, 1 case](https://openairdocs.org/ntsb-findings/01023244/cases.md?model=8380326), [All aircraft, 36 cases](https://openairdocs.org/ntsb-findings/01023244/cases.md)
- [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Thrush S2R-T660, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=8380326), [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: [Thrush S2R-T660, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=8380326), [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.

- [Takeoff: Landing gear collapse](https://openairdocs.org/ntsb-events/094) (defining event); cases with it: [Thrush S2R-T660, 2 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=8380326), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md)
- [Takeoff: Loss of control on ground](https://openairdocs.org/ntsb-events/230); cases with it: [Thrush S2R-T660, 2 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=8380326), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md)
- [Takeoff: Runway excursion](https://openairdocs.org/ntsb-events/300); cases with it: [Thrush S2R-T660, 2 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=8380326), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md)
- [Takeoff: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Thrush S2R-T660, 3 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=8380326), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md)

## Analysis

The pilot of the tailwheel-equipped airplane reported that, during the takeoff roll, the left main landing gear tire failed. The airplane veered left, exited the runway and impacted terrain. The right wing and the engine truss sustained substantial damage. The pilot added that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.

## Aircraft

- Registration: [N51080](https://openairdocs.org/aircraft/N51080), registered now, S/N T660-158DC, built 2020 (OpenAirDocs)
- Reported make and model: THRUSH AIRCRAFT LLC S2R-T660 (NO SERIES)
- Registry model: [Thrush S2R-T660](https://openairdocs.org/model/thrush-s2r-t660) (registry code 8380326) (OpenAirDocs)
- Registry engine: [Pratt & Whitney Canada PT6A-67AG](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-67ag) (registry code 52211, turbo-prop) (OpenAirDocs)
- Category: Airplane
- Serial number: T660-158DC
- Year built: 2020
- Airframe hours: 130
- Engines: Pratt & Whitney PT6-67AG 1350 horsepower turbo prop
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: K2 Aerial Application LLC
- Registered owner: K2 Aerial Application LLC
- Airworthiness certificate: Standard, Normal; Special, Restricted (Special)
- Last inspection: Continuous airworthiness, April 9, 2021
- Destination: Same as departure
- Airport: HRI, Hermiston Muni, runway 05/23, 4,501 × 75 ft, asphalt
- Equipment: ADS-B, Stall warning system

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; injuries: none; commercial; airplane ratings: single-engine land, multi-engine land; medical: class 2, without waivers/limitations; last flight review November 4, 2019; seat: front; restraint: 4-point; flight hours: 2,700 total, 2,500 as pilot in command, 12 in the last 90 days, 7 in the last 30 days, 0 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: variable at 5 knots
- Visibility: 10 statute miles
- Temperature: 75 °F, dew point 28 °F
- Altimeter: 30.22 inHg
- Observed at: HRI

## 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 20210417001249A](https://openairdocs.org/incident/20210417001249A), Apr 17, 2021: Thrush Aircraft LLC S2R-T660, Hermiston, OR, Substantial damage. During takeoff the airplane experienced a left tire blow out during rotation. The airplane veered left while the pilot applied right braking with no effect.…

## Docket (3 files)

The files NTSB released with the investigation on September 1, 2021, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=102936. 6.7 MB in all.

- Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 4.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12378987&FileExtension=pdf&FileName=6120%20162_Redacted-Rel.pdf
- Pilot memorandum for record (item 2, PDF, 1 page, 145 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12378289&FileExtension=pdf&FileName=PILOT%20MEMORANDUM%20FOR%20RECORD%20162-Rel.pdf
- Accident photos (item 3, PDF, 3 pages, 2.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12258988&FileExtension=pdf&FileName=Accident%20Photos%20162-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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