Individually Owned: 150,657
Corporate Owned: 137,281
Lakewood Airpark Airport
Aircraft Accident/Incident Report
Lakewood, Wisconsin 54138
Wednesday, June 13, 2007 9:03 CDT
NTSB Narrative Summary Released at Completion of Accident
The pilot reported that the right nose wheel separated from the float approximately 210 feet from where the airplane started the takeoff roll, and about 35 feet later, the left nose wheel separated from the float. After the left nose wheel separated, the left nose wheel strut dug into the turf causing the aircraft to nose over. The inspection of the airplane revealed that the nose wheel struts had separated from the castoring assemblies. The left and right nose wheel struts and castoring assemblies were sent to the National Transportation Safety Board's (NTSB) Materials Laboratory for a metallurgical examination. The visual examination of the parts showed that the castoring nose wheels from both floats had fractured at the bearing boss welds to the strut arms. Both strut arms were bent upward. The right arm was bent about 30 degrees and the left was bent about 5 degrees. The strut fractures were located through the fusion zones of the strut to bearing boss welds with some tearing of the boss material at the upper edges of the welds. Microscopic inspection of the fractures on both struts revealed matte gray textured fracture surfaces typical of overstress fractures. Deformation and rearward displacement of the boss material adjacent to the upper edge tears and fracture regions, along with the smearing contact of the lower fracture areas, were consistent with bending overstress forces on the weld joint. On August 8, 2007, Baumann Floats LLC issued Service Bulletin No. 001. The reason for the issuance of the service bulletin was "to improve the service and reliability of the nose gear assembly." The service bulletin modified the G-129 nose gear tube assembly. Compliance with the service bulletin was considered mandatory by the manufacturer upon receipt of the service bulletin, and specifically prior to operating off grass or soft field areas.
NTSB Probable Cause Narrative
The amphibian nose wheel strut assembly separated due to an overload fracture as a result of the manufacturer's inadequate design.
Event Information
| Type of Event | Accident |
| Event Date | 6/13/2007 |
| Event Day of the Week | Wednesday |
| Time of Event | 903 |
| Event Time Zone | Central Daylight Time |
| Event City | Lakewood |
| Event State | WISCONSIN |
| Event Country | -- |
| Zipcode of the event site | 54138 |
| Event Date Year | 2007 |
| Event Date Month | 6 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 451955N |
| Event Location Longitude | 0883209W |
| Event Location Airport | Lakewood Airpark |
| Event Location Nearest Airport ID | 4WN3 |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | 1300 |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 955 Central Daylight Time |
| Direction of event from weather observation facility (degrees) | 246 |
| Weather Observation Facility ID | KAIG |
| Elevation of weather observation facility | 1521 |
| Distance of event from weather observation facility (units?) | 26 |
| Time Zone of the weather observation | CDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | -- |
| Lowest Non-Ceiling Height | -- |
| Sky/Lowest/Cloud Conditions | Clear |
| Sky Condition for Lowest Ceiling | None |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 24 |
| Dew Point at event time (in degress fahrenheit) | 11 |
| Wind Direction (degrees magnetic) | 160 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 5 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | 30.19 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | -- |
| Event Highest Injury | Minor |
| On Ground, Fatal Injuries | -- |
| On Ground, Minor Injuries | -- |
| On Ground, Serious Injuries | -- |
| Injury Total Fatal | -- |
| Injury Total Minor | 1 |
| Injury Total None | 2 |
| Injury Total Serious | -- |
| Injury Total All | 1 |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 23130 |
| NTSB Notification Source | FAA |
| NTSB Notification Date | Jun 13 2007 12:00AM |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | DMS |
| Date of most recent change to record | Mar 31 2008 11:52AM |
| User who most recently changed record | NTSB\johb |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | Federal Aviation Administration - MKE FSDO |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N736MV |
| NTSB Number | CHI07LA168 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | None |
| Flight plan Was Activated? | No |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Cessna |
| Aircraft Model | R172K |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | R1722642 |
| Certified Max Gross Weight | 2550 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | -- |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 4 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Annual |
| Date of Last Inspection | Jun 1 2007 12:00AM |
| Airframe hours since last inspection | -- |
| Airframe Hours | 2300 |
| ELT Installed | Yes |
| ELT Activated | Yes |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | Norbert J Langer Trustee & Vivian A Langer Trustee |
| Aircraft Owner Street Address | PO Box 56 |
| Aircraft Owner City | Lakewood |
| Aircraft Owner State | WI |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 54138 |
| Operator is an individual? | Yes |
| Operator Name | -- |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | -- |
| Operator City | -- |
| Operator State | -- |
| Operator Country | -- |
| Operator Zip code | -- |
| Operator Code | -- |
| Owner has at least one certificate | None |
| Other Operator of large aircraft? | -- |
| Certified for Part 133 or 137 Operation | -- |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | -- |
| Indicates Domestic or International Flight | -- |
| Operator carrying Pax/Cargo/Mail | -- |
| Type of Flying (Per_Bus / Primary) | Personal |
| Second Pilot on Board | No |
| Departure Point Same as Event | Yes |
| Departure Airport Code | 4WN3 |
| Departure City | Lakewood |
| Departure State | WI |
| Departure Country | USA |
| Departure Time | 1000 |
| Departure Time Zone | CDT |
| Destination Same as Local Flt | dest & departure same, accident can occur anywhere |
| Destination Airport Code | -- |
| Destination City | -- |
| Destination State | -- |
| Destination Country | -- |
| Specific Phase of Flight | Takeoff - roll/run |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Feb 22 2008 8:17AM |
| User who most recently changed record | BOWL |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | 09 |
| Runway Length | 2500 |
| Runway Width | 150 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |