Individually Owned: 150,657
Corporate Owned: 137,281
Tooele Valley Field Airport
Aircraft Accident/Incident Report
Tooele, Utah 84074
Sunday, September 2, 2007 9:15 MDT
NTSB Narrative Summary Released at Completion of Accident
The pilot said that as he approached his destination, he noticed a large thunderstorm over the airport. He said that his wingman elected to land, but radioed back to him that it was very bumpy. The pilot said that his first two attempts at landing ended with go-arounds due to severe turbulence. On his third attempt, he lost engine power and selected a field for a forced landing. During the forced landing, he encountered severe wind shear (downdraft) on two occasions. During his landing flare, the airplane's main landing gear impacted a ditch and separated from the fuselage. Photographs of the wreckage indicate that the outboard right wing skin had delaminated from the spar and both wing root areas exhibited visible cracks in the upper wing skin. An aerospace engineer from the National Transportation Safety Board said the cracks above the main spar carry through structure indicate hidden damage in the spar. A Federal Aviation Administration inspector and the pilot examined the airplane in the field. They identified no abnormalities with the engine; the reason for the loss of engine power was not determined.
NTSB Probable Cause Narrative
The loss of engine power for an undetermined reason. Contributing factors were the lack of suitable terrain for the forced landing and the wind shear conditions encountered during the forced landing attempt.
Event Information
| Type of Event | Accident |
| Event Date | 9/2/2007 |
| Event Day of the Week | Sunday |
| Time of Event | 915 |
| Event Time Zone | Mountain Daylight Time |
| Event City | Tooele |
| Event State | UTAH |
| Event Country | -- |
| Zipcode of the event site | 84074 |
| Event Date Year | 2007 |
| Event Date Month | 9 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 403645N |
| Event Location Longitude | 1122103W |
| Event Location Airport | Tooele Valley Field |
| Event Location Nearest Airport ID | TVY |
| Indicates whether the acc/inc occurred off or on an airport | Off Airport/Airstrip |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | 4230 |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 856 Mountain Daylight Time |
| Direction of event from weather observation facility (degrees) | 45 |
| Weather Observation Facility ID | SLC |
| Elevation of weather observation facility | 4227 |
| Distance of event from weather observation facility (units?) | 18 |
| Time Zone of the weather observation | MDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 1400 |
| Lowest Non-Ceiling Height | 850 |
| Sky/Lowest/Cloud Conditions | Few |
| 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) | 27 |
| Dew Point at event time (in degress fahrenheit) | 9 |
| Wind Direction (degrees magnetic) | 340 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 10 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Gusting |
| Wind Gust (knots) | 20 |
| Altimeter Setting at event time (in. Hg) | 29.92 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | -- |
| On Ground, Minor Injuries | -- |
| On Ground, Serious Injuries | -- |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 1 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 23373 |
| NTSB Notification Source | Salt Lake City, FAA FSDO |
| NTSB Notification Date | Nov 28 2007 12:00AM |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | DMS |
| Date of most recent change to record | Apr 30 2008 1:28PM |
| User who most recently changed record | NTSB\johb |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | Salt Lake City, UT |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N547DB |
| NTSB Number | SEA07LA276 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | None |
| Flight plan Was Activated? | -- |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Werner |
| Aircraft Model | Vari-Eze |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 1272001 |
| Certified Max Gross Weight | 1300 |
| 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 | 2 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Conditional |
| Date of Last Inspection | Feb 1 2007 12:00AM |
| Airframe hours since last inspection | -- |
| Airframe Hours | 583 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | Dana J. Byerley |
| Aircraft Owner Street Address | -- |
| Aircraft Owner City | Sandy |
| Aircraft Owner State | UT |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 84093 |
| Operator is an individual? | No |
| 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 | No |
| Departure Airport Code | KNB |
| Departure City | Kanab |
| Departure State | UT |
| Departure Country | USA |
| Departure Time | 818 |
| Departure Time Zone | MDT |
| Destination Same as Local Flt | crash at destination city |
| Destination Airport Code | TVY |
| Destination City | Tooele |
| Destination State | UT |
| Destination Country | USA |
| Specific Phase of Flight | Approach - VFR pattern - downwind |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Mar 27 2008 6:08PM |
| User who most recently changed record | STAM |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | 35 |
| Runway Length | 6100 |
| Runway Width | 100 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |