# NTSB CEN11CA139: Cessna 305A, N6897, Spooner, WI, December 25, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: December 25, 2010, 14:00 local (20:00 UTC) - Place: Spooner, WI - Coordinates: 45.835556, -91.80278 - Nearby events: https://openairdocs.org/map.md?lat=45.8356&lon=-91.8028&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report May 26, 2011 - Report: Approved by Office Director - NTSB office: Central Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 78091 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN11CA139 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/78091/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=78091 - Page: https://openairdocs.org/ntsb/CEN11CA139 ## Probable cause The pilot's selection of unsuitable terrain for landing on a snow-covered lake. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Info processing/decision: decision making/judgment](https://openairdocs.org/ntsb-findings/02041520): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Cessna 305A, 2 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md?model=2074002), [All aircraft, 3,098 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md) - [Runway/land/takeoff/taxi surface: snow/slush/ice covered surface](https://openairdocs.org/ntsb-findings/03023015): Environmental issues › Physical environment · Contributed to outcome (probable cause); cases with it: [Cessna 305A, 1 case](https://openairdocs.org/ntsb-findings/03023015/cases.md?model=2074002), [All aircraft, 219 cases](https://openairdocs.org/ntsb-findings/03023015/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: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470) (defining event); cases with it: [Cessna 305A, 9 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=2074002), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot reported that prior to landing, he performed two low level passes to determine a safe landing area on the frozen lake. He said that during the landing, the left landing gear ski touched down and he heard a bang as the left ski impacted a snow-covered raised ice ridge. He slowed the airplane for the landing rollout and the airplane came to rest upright. A postaccident examination of the airplane revealed that the landing gear box structure was bent and the bulkheads were damaged. The examination did not disclose any evidence of a mechanical malfunction. The pilot reported that he should have landed the airplane in the middle of lake which likely would have had less slush and rough ice. ## Factual narrative The pilot reported that prior to landing, he performed two low level passes to determine a safe landing area on the frozen lake. During the landing, the left landing gear ski touched down and the pilot heard a bang as the left ski impacted a snow covered raised ice ridge. The pilot slowed the airplane for the remaining landing and it came to rest upright. Examination of the airplane revealed that the landing gear box structure was bent and the bulkheads were damaged. No mechanical anomalies were noted with the airplane. The pilot reported that he should have landed the airplane in the middle of lake which likely would have had less slush and rough ice. ## Aircraft - Registration: [N6897](https://openairdocs.org/aircraft/N6897), registered now, S/N 22728, built 1955 (OpenAirDocs) - Reported make and model: CESSNA 305A - Registry model: [Cessna 305A](https://openairdocs.org/model/cessna-305a) (registry code 2074002) (OpenAirDocs) - Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 22728 - Airframe hours: 6587 - Engines: CONT MOTOR O-470-11 213 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Kronlund Kevin - Registered owner: Kronlund Kevin - Airworthiness certificate: Standard, Normal - Last inspection: Annual, September 2, 2010 - Departed: PVT, Spooner, WI - Destination: Spooner, WI ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 53; injuries: none; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; last flight review August 24, 2009; seat: front; flight hours: 541 total, 339 in this make and model, 484 as pilot in command, 12 in the last 90 days, 1 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 6 statute miles - Lowest ceiling: 5,000 ft overcast - Temperature: 21 °F - Altimeter: 29.73 inHg - Observed at: RPD, 32 nm away ## 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 20101225054239A](https://openairdocs.org/incident/20101225054239A), Dec 25, 2010: Cessna 305A, Spooner, WI, Substantial damage. Pilot set up a normal approach to an ice and snow covered lake. Upon touchdown, the pilot heard a loud noise and observed the left landing gear to be sticking… ## Docket (1 files) The files NTSB released with the investigation on January 25, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=78091. 307 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 307 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40341885&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. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.