# NTSB WPR24LA165: Grumman Acft ENG Cor-Schweizer G-164A, N9853, Rome, OR, May 26, 2024

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: May 26, 2024, 10:00 local (16:00 UTC)
- Place: Rome, OR
- Coordinates: 42.841059, -117.63285
- Nearby events: https://openairdocs.org/map.md?lat=42.8411&lon=-117.6329&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing-landing roll: 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: Western Pacific Region
- Parties: FAA
- NTSB case key (mKey): 194376
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR24LA165
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/194376/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=194376
- Page: https://openairdocs.org/ntsb/WPR24LA165

## Probable cause

The pilot’s failure to maintain airplane control during landing.

## Findings

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

- [Runway/land/takeoff/taxi surface: soft surface](https://openairdocs.org/ntsb-findings/03023020): Environmental issues › Physical environment · Effect on operation; cases with it: [Grumman Acft ENG Cor-Schweizer G-164A, 2 cases](https://openairdocs.org/ntsb-findings/03023020/cases.md?model=3952801), [All aircraft, 264 cases](https://openairdocs.org/ntsb-findings/03023020/cases.md)
- [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Grumman Acft ENG Cor-Schweizer G-164A, 10 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=3952801), [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: [Grumman Acft ENG Cor-Schweizer G-164A, 3 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=3952801), [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.

- [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Grumman Acft ENG Cor-Schweizer G-164A, 5 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=3952801), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md)
- [Landing-landing roll: Nose over/nose down](https://openairdocs.org/ntsb-events/096); cases with it: [Grumman Acft ENG Cor-Schweizer G-164A, 8 cases](https://openairdocs.org/ntsb-events/096/sequence.md?model=3952801), [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md)

## Analysis

The pilot reported that while landing on a gravel road, the right main tire sank into soft terrain along the right side of the road. Subsequently, the airplane nosed over and came to rest inverted. During the accident sequence, the airplane sustained substantial damage to the upper wings and vertical stabilizer. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that precluded normal operation.

## Aircraft

- Registration: [N9853](https://openairdocs.org/aircraft/N9853), registered now, S/N 1291, built 1974 (OpenAirDocs)
- Reported make and model: GRUMMAN ACFT ENG COR-SCHWEIZER G-164A
- Registry model: [Grumman Acft ENG Cor-Schweizer G-164A](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164a) (registry code 3952801) (OpenAirDocs)
- Registry engine: [AiResearch TPE331 series](https://openairdocs.org/engine/airesearch-tpe331-series) (registry code 01517, turbo-prop) (OpenAirDocs)
- Category: Airplane
- Serial number: 1291
- Year built: 1974
- Engines: Garrett AiResearch TPE-331 turbo prop
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Oregon Trail Air Service LLC
- Registered owner: Oregon Trail Air Service LLC
- Airworthiness certificate: Special, Restricted (Special)
- Equipment: Handheld GPS, Stall warning system

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 52; injuries: none; flight instructor, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, waiver time limited special; last flight review March 26, 2023; seat: single; restraint: 3-point; flight hours: 14,372 total, 500 in this make and model, 14,000 as pilot in command, 100 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 70° at 7 knots
- Lowest ceiling: none
- Temperature: 55 °F, dew point 30 °F
- Altimeter: 30.09 inHg
- Observed at: KREO, 18 nm away
- METAR: 	
METAR KREO 261552Z AUTO 07007KT 13/M01 A3009 RMK AO1 SLP174 T01331011=

## 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 20240526005779A](https://openairdocs.org/incident/20240526005779A), May 26, 2024: Grumman Acft Eng Cor-Schweizer G-164A, Rome, OR, Substantial damage. While landing on a dirt road being used for part 137 operations, the aircraft drifted off centerline upon landing rollout, and entered soft tilled dirt,…

## Other investigations on N9853 (1)

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.

- [NTSB SEA96LA176](https://openairdocs.org/ntsb/SEA96LA176), Aug 3, 1996: Grumman-Schweizer G-164A (N9853), Belgrade, MT, substantial damage. Probable cause: loss of engine power for undetermined reason(s). A factor relating to the accident was: a ditch in the field where the forced landing was executed.

## Docket (2 files)

The files NTSB released with the investigation on November 22, 2024, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=194376. 2.2 MB in all.

- Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 1.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17448866&FileExtension=pdf&FileName=6120%20Flattened_Redacted-Rel.pdf
- Photo array (item 2, PDF, 4 pages, 3 photos, 482 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17449010&FileExtension=pdf&FileName=Photo%20Array-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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