# NTSB CEN10CA578: Cessna 172B, N7560X, Oconomowoc, WI, September 29, 2010

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Data collection · Final report
- Date: September 29, 2010, 15:50 local (20:50 UTC)
- Place: Oconomowoc, WI
- Coordinates: 43.138889, -88.472221 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.1389&lon=-88.4722&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report March 16, 2011
- Report: Approved by Office Director
- NTSB office: Central Region
- Parties: Federal Aviation Administration
- NTSB case key (mKey): 77454
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN10CA578
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/77454/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=77454
- Page: https://openairdocs.org/ntsb/CEN10CA578

## Probable cause

The pilot's selection of unsuitable terrain for landing the float-equipped airplane on a turf runway.

## Findings

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

- [Performance/control parameters: landing flare](https://openairdocs.org/ntsb-findings/01062041): Aircraft › Aircraft oper/perf/capability · Incorrect use/operation (probable cause); cases with it: [Cessna 172B, 3 cases](https://openairdocs.org/ntsb-findings/01062041/cases.md?model=2072406), [All aircraft, 1,285 cases](https://openairdocs.org/ntsb-findings/01062041/cases.md)
- [Action: incorrect action performance](https://openairdocs.org/ntsb-findings/02041015): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Cessna 172B, 1 case](https://openairdocs.org/ntsb-findings/02041015/cases.md?model=2072406), [All aircraft, 1,386 cases](https://openairdocs.org/ntsb-findings/02041015/cases.md)

## Sequence of events

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

- [Landing: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470) (defining event); cases with it: [Cessna 172B, 6 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=2072406), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md)

## Analysis

The pilot purchased the float-equipped airplane on the day of the accident. During landing on the turf runway, one of the airplane's floats dug into the terrain and the airplane nosed over. The pilot reported no preimpact mechanical problems with the airplane. Examination of the airplane revealed that the vertical stabilizer and rudder were bent.

## Factual narrative

The pilot purchased the float-equipped airplane on the day of the accident. During landing on the turf runway, one of the airplane's floats dug into the terrain and the airplane nosed over. The pilot reported no mechanical problems with the airplane prior to the accident. Examination of the airplane revealed the vertical stabilizer and rudder were bent.

## Aircraft

- Registration: [N7560X](https://openairdocs.org/aircraft/N7560X), registered now, S/N 17248060, built 1960 (OpenAirDocs)
- Reported make and model: CESSNA 172B
- Registry model: [Cessna 172B](https://openairdocs.org/model/cessna-172b) (registry code 2072406) (OpenAirDocs)
- Registry engine: [Continental 0-300 series](https://openairdocs.org/engine/continental-0-300-series) (registry code 17022, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 17248060
- Airframe hours: 3339
- Engines: CONT MOTOR IO-360-KB 145 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, April 23, 2010
- Departed: Lake Hudson, MI
- Destination: OWI8, Oconomowoc, WI
- Airport: OWI8, Oconomowoc Airport, runway 18, 1,400 × 200 ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 74; injuries: none; private; airplane ratings: single-engine land, single-engine sea; instrument ratings: airplane; medical: class 3, with waivers/limitations; last flight review May 25, 2010; seat: left; flight hours: 8,250 total, 6 in this make and model, 25 in the last 90 days, 8 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 220° at 4 knots
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 73 °F, dew point 39 °F
- Altimeter: 29.89 inHg

## 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 20100929046929A](https://openairdocs.org/incident/20100929046929A), Sep 29, 2010: Cessna 172B, Oconomowoc, WI, Substantial damage. Pilot attempted landing aircraft with straight (non-amphibious) floats on dry grass runway. Touched down, lost control, and veered off runway. Aircraft flipped…

## Docket (1 files)

The files NTSB released with the investigation on October 12, 2010, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=77454. 443 KB in all.

- Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 443 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40337456&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.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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