Individually Owned: 150,657
Corporate Owned: 137,281
Wittman Regional Airport
Aircraft Accident/Incident Report
Oshkosh, Wisconsin 54901
Friday, July 29, 2005 7:00 CDT
NTSB Narrative Summary Released at Completion of Accident
The amateur-built airplane was damaged during a forced landing following a partial loss of engine power during initial climb. The pilot stated that the engine "lost power" during initial climb after takeoff. The pilot reported that the airplane contacted a tree during the subsequent forced landing and then impacted a front yard of a nearby residence. The pilot reported that normal engine operation is around 6,300 rpm during takeoff. The pilot stated that during the accident takeoff the engine was only developing 5,900 rpm. Engine crankshaft and valve continuity was established by rotating the propeller flange during a post-accident examination. Both carburetors were disassembled. The magneto-side carburetor fuel bowl contained several small fragments of black material. The black material was consistent with degraded rubber from an automotive-style fuel line. The engine was outfitted with black rubber, automobile-style fuel lines. The power-takeoff carburetor fuel bowl was void of containments.
NTSB Probable Cause Narrative
The partial loss of engine power due to an obstructed carburetor fuel metering jet. Factors to the accident included the low altitude at which the loss of engine power occurred, the contamination of the fuel system from degraded automobile-style fuel lines, and the tree that the airplane impacted during the forced landing.
Event Information
| Type of Event | Accident |
| Event Date | 7/29/2005 |
| Event Day of the Week | Friday |
| Time of Event | 700 |
| Event Time Zone | Central Daylight Time |
| Event City | Oshkosh |
| Event State | WISCONSIN |
| Event Country | -- |
| Zipcode of the event site | 54901 |
| Event Date Year | 2005 |
| Event Date Month | 7 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 435904N |
| Event Location Longitude | 0883325W |
| Event Location Airport | Wittman Regional Airport |
| Event Location Nearest Airport ID | OSH |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | 0 |
| Degrees magnetic from airport | -- |
| Airport Elevation | 808 |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 653 Central Daylight Time |
| Direction of event from weather observation facility (degrees) | -- |
| Weather Observation Facility ID | OSH |
| Elevation of weather observation facility | 808 |
| Distance of event from weather observation facility (units?) | 0 |
| Time Zone of the weather observation | CDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 1600 |
| Lowest Non-Ceiling Height | -- |
| Sky/Lowest/Cloud Conditions | -- |
| Sky Condition for Lowest Ceiling | Broken |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 19 |
| Dew Point at event time (in degress fahrenheit) | 16 |
| Wind Direction (degrees magnetic) | 40 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 7 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | 30.15 |
| 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 | -- |
| Injury Total Serious | -- |
| Injury Total All | 1 |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 18571 |
| NTSB Notification Source | FAA |
| NTSB Notification Date | Jul 29 2005 12:00AM |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | DMS |
| Date of most recent change to record | Oct 27 2005 6:51AM |
| User who most recently changed record | NTSB\JOHB |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | Federal Aviation Administration - Milwaukee FSDO |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | C-IAVT |
| NTSB Number | CHI05CA204 |
| 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 | Wilson |
| Aircraft Model | Acrolite 1T |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | AC 106 |
| Certified Max Gross Weight | 720 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | -- |
| Aircraft is a homebuilt? | Yes |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 1 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | Annual |
| Date of Last Inspection | Nov 1 2004 12:00AM |
| Airframe hours since last inspection | 11.3 |
| Airframe Hours | 52.2 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | William Ron Wilson |
| Aircraft Owner Street Address | Rural Route #1 |
| Aircraft Owner City | Murillo |
| Aircraft Owner State | -- |
| Aircraft Owner Country | CA |
| Aircraft Owner Zipcode | P0T 2G0 |
| 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 | OSH |
| Departure City | Oshkosh |
| Departure State | WI |
| Departure Country | USA |
| Departure Time | 700 |
| Departure Time Zone | CDT |
| Destination Same as Local Flt | -- |
| Destination Airport Code | HYR |
| Destination City | Hayward |
| Destination State | WI |
| Destination Country | USA |
| Specific Phase of Flight | Takeoff - initial climb |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Aug 29 2005 8:32AM |
| User who most recently changed record | SULP |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | 15 |
| Runway Length | 1200 |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |