Individually Owned: 150,657
Corporate Owned: 137,281
Boulder Municipal Airport
Aircraft Accident/Incident Report
Boulder, Colorado 80026
Sunday, August 16, 1998 16:30 MDT
NTSB Narrative Summary Released at Completion of Accident
As the pilot approached the airport for a full stop landing, he heard the pilot of another airplane, which was landing on runway 8 report that he had a tail wind during his landing sequence. The pilot 'noticed the wind sock on the east end of the runway was standing straight out in a direction that appeared to be 180 degrees.' The pilot landed on runway 26, but reported having difficulty keeping the airplane aligned with the centerline. He said 'I didn't feel at the time I stood any chance of gaining airspeed to execute a climb.' He performed a ground loop rather then go in the lake on the west end of the runway. One witness reported that immediately after the accident they noticed that the wind was coming from the northeast. The winds at the nearest reporting station, 9 nautical miles southeast, were 180 degrees and 13 knots at 1549 and at 1655, the winds were 150 degrees and 11 knots gusting to 20 knots.
NTSB Probable Cause Narrative
The pilot's intentional ground loop and his inadequate compensation for the wind condition. A contributng factor was crosswinds.
Event Information
| Type of Event | Accident |
| Event Date | 8/16/1998 |
| Event Day of the Week | Sunday |
| Time of Event | 1630 |
| Event Time Zone | Mountain Daylight Time |
| Event City | BOULDER |
| Event State | COLORADO |
| Event Country | -- |
| Zipcode of the event site | 80026 |
| Event Date Year | 1998 |
| Event Date Month | 8 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | BOULDER MUNICIPAL |
| Event Location Nearest Airport ID | 1V5 |
| 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 | 5288 |
| Weather Briefing Completeness | Full |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1655 Mountain Daylight Time |
| Direction of event from weather observation facility (degrees) | 150 |
| Weather Observation Facility ID | BJC |
| Elevation of weather observation facility | 5670 |
| Distance of event from weather observation facility (units?) | 9 |
| Time Zone of the weather observation | MDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 20000 |
| Lowest Non-Ceiling Height | 8000 |
| Sky/Lowest/Cloud Conditions | Thin Broken |
| Sky Condition for Lowest Ceiling | Broken |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 50 |
| Air Temperature at event time (in degrees celsius) | 27 |
| Dew Point at event time (in degress fahrenheit) | 11 |
| Wind Direction (degrees magnetic) | 150 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 11 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Unknown |
| Wind Gust (knots) | 20 |
| Altimeter Setting at event time (in. Hg) | 30 |
| Density Altitude (feet) | 7807 |
| Intensity of Precipitation | Unknown |
| METAR weather report | -- |
| Event Highest Injury | Minor |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | 3 |
| Injury Total None | -- |
| Injury Total Serious | -- |
| Injury Total All | 3 |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 1327 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Aug 17 1998 12:00AM |
| NTSB Notification Time | 1127 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Dec 11 2000 11:42AM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N2574V |
| NTSB Number | FTW98LA360 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | VFR |
| Flight plan Was Activated? | -- |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Cessna |
| Aircraft Model | 170 |
| Aircraft Series Identifier | 170 |
| Aircraft Serial Number | 18111 |
| Certified Max Gross Weight | 2200 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | U.S. Registered/U.S. Soil |
| 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 | Fixed |
| Aircraft, Type of Last Inspection | Annual |
| Date of Last Inspection | Aug 6 1997 12:00AM |
| Airframe hours since last inspection | 126 |
| Airframe Hours | 5688 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | ERIC D. TWOMBLY |
| Aircraft Owner Street Address | P.O. BOX 811 |
| Aircraft Owner City | HALFWAY |
| Aircraft Owner State | OR |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 97834 |
| Operator is an individual? | -- |
| 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? | No |
| Certified for Part 133 or 137 Operation | Unknown |
| 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 | OGA |
| Departure City | OGALLALA |
| Departure State | NE |
| Departure Country | |
| Departure Time | 1330 |
| Departure Time Zone | MDT |
| Destination Same as Local Flt | crash at destination city |
| Destination Airport Code | 1V5 |
| Destination City | |
| Destination State | |
| Destination Country | |
| Specific Phase of Flight | Landing |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jan 2 2001 10:34AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 26 |
| Runway Length | 4100 |
| Runway Width | 75 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |