# NTSB WPR24LA253: Canadian Car & Foundry Harvard MK IV, N52494, Oshkosh, WI, July 25, 2024

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: July 25, 2024, 08:40 local (13:40 UTC)
- Place: Oshkosh, WI · On Airport
- Coordinates: 43.984371, -88.557042 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.9844&lon=-88.5570&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing-flare/touchdown: Loss of control on ground](https://openairdocs.org/ntsb-events/230)
- Highest injury: No injuries
- Injuries: 2 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): 194764
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR24LA253
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/194764/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=194764
- Page: https://openairdocs.org/ntsb/WPR24LA253

## Probable cause

The pilot's failure to maintain directional control during the landing roll, which resulted in a ground loop.

## Findings

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

- [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Canadian Car & Foundry HARVARD MK IV, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=1922828), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md)
- [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Canadian Car & Foundry HARVARD MK IV, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=1922828), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md)
- [Turbulence: wake turbulence](https://openairdocs.org/ntsb-findings/03032025): Environmental issues › Conditions/weather/phenomena · Effect on operation; cases with it: [Canadian Car & Foundry HARVARD MK IV, 1 case](https://openairdocs.org/ntsb-findings/03032025/cases.md?model=1922828), [All aircraft, 47 cases](https://openairdocs.org/ntsb-findings/03032025/cases.md)

## Sequence of events

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

- [Landing-flare/touchdown: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Canadian Car & Foundry HARVARD MK IV, 1 case](https://openairdocs.org/ntsb-events/230/sequence.md?model=1922828), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md)

## Analysis

The pilot of the tailwheel equipped airplane reported that he landed behind another airplane. During the landing roll, the airplane encountered “wake turbulence” and veered to the right. He applied power in an attempt to regain rudder authority and execute a go-around; however, the airplane exited the right side of the runway, ground looped, and the right wing struck the ground. The airplane sustained substantial damage to the right aileron. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

## Aircraft

- Registration: [N52494](https://openairdocs.org/aircraft/N52494), registered now, S/N CCF4-387 (OpenAirDocs)
- Reported make and model: CANADIAN CAR & FOUNDRY HARVARD MK IV
- Registry model: [Canadian Car & Foundry HARVARD MK IV](https://openairdocs.org/model/canadian-car-foundry-harvard-mk-iv) (registry code 1922828) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: CCF4-387
- Airframe hours: 5887.6
- Engines: Prat & Witney R1340 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Navy Flight Trainer LLC
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Condition, July 10, 2024
- Airport: OSH, Wittman Rgnl, runway 27, 6,179 × 150 ft, concrete
- Equipment: ADS-B, Electronic flight bag or handheld device

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 69; injuries: none; airline transport, flight engineer, commercial; airplane ratings: multi-engine land, single-engine land; medical: class 1, with waivers/limitations; last flight review April 18, 2024; seat: front; restraint: 5-point; flight hours: 26,000 total, 521 in this make and model, 14,000 as pilot in command, 55.6 in the last 90 days, 24.2 in the last 30 days, 2.5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 10 statute miles
- Lowest ceiling: 1,600 ft overcast
- Temperature: 68 °F, dew point 63 °F
- Altimeter: 30.28 inHg
- Observed at: KOSH
- METAR: KOSH 251353Z 00000KT 10SM SCT008 OVC016 20/17 A3028 RMK AO2 SLP245 T02000167

## Docket (2 files)

The files NTSB released with the investigation on February 27, 2025, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=194764. 5.0 MB in all.

- Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 11 pages, 4.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17454635&FileExtension=pdf&FileName=NTSB%206120_Redacted-Rel.pdf
- Photo array (item 2, PDF, 3 pages, 471 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17455808&FileExtension=pdf&FileName=WPR24LA253%20photo%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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