Individually Owned: 150,657
Corporate Owned: 137,281
Stark's Twin Oaks Airpark Airport
Aircraft Accident/Incident Report
Hillsboro, Oregon 97123
Friday, June 9, 2000 12:15 PDT
NTSB Narrative Summary Released at Completion of Accident
While en route to his original destination, and while diverting to his home airport, the pilot was unable to achieve the desired indicated airspeed using the throttle settings that he was accustomed to. Upon reaching the airport, due to local takeoff and landing terrain avoidance procedures, the pilot chose to land on a runway with a tailwind of approximately 10 knots. Believing that the aircraft's engine was experiencing a malfunction that reduced its ability to produce thrust, he chose to use only 20 degrees of flaps while on final. As he crossed the runway threshold, he realized that his ground speed was excessive, but elected not to go around because of the suspected engine problem and the danger of impacting the trees on rising terrain off the departure end of the runway. The aircraft touched down about half way down the wet runway, and although the pilot applied maximum braking, he was unable to stop the aircraft before it departed the far end of the runway and went over an embankment. A post-accident inspection of the engine determined that it had not malfunctioned, but multiple contaminants were found in the pitot system mast and lines. The size and structure of the contaminants were such that they interfered with the correct display of the aircraft's indicated airspeed.
NTSB Probable Cause Narrative
The pilot's inability to maintain the correct approach airspeed (Vref) on final due to incorrect airspeed indications resulting from a partial blockage of the pitot line. Factors include a quartering tailwind, a wet runway, and the pilot's decision not to lower the flaps during the landing.
Event Information
| Type of Event | Accident |
| Event Date | 6/9/2000 |
| Event Day of the Week | Friday |
| Time of Event | 1215 |
| Event Time Zone | Pacific Daylight Time |
| Event City | HILLSBORO |
| Event State | OREGON |
| Event Country | -- |
| Zipcode of the event site | 97123 |
| Event Date Year | 2000 |
| Event Date Month | 6 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | -- |
| Event Location Longitude | -- |
| Event Location Airport | STARK'S TWIN OAKS AIRPARK |
| Event Location Nearest Airport ID | 7S3 |
| 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 | 160 |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Pilot |
| Time of the weather observation | 0 |
| Direction of event from weather observation facility (degrees) | 0 |
| Weather Observation Facility ID | |
| Elevation of weather observation facility | 0 |
| Distance of event from weather observation facility (units?) | 0 |
| Time Zone of the weather observation | |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 2500 |
| Lowest Non-Ceiling Height | 0 |
| Sky/Lowest/Cloud Conditions | Unknown |
| Sky Condition for Lowest Ceiling | Overcast |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 6 |
| Air Temperature at event time (in degrees celsius) | 11 |
| Dew Point at event time (in degress fahrenheit) | -- |
| Wind Direction (degrees magnetic) | 230 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 7 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Unknown |
| Wind Gust (knots) | 15 |
| Altimeter Setting at event time (in. Hg) | -- |
| Density Altitude (feet) | -- |
| 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 | 2 |
| Injury Total None | -- |
| Injury Total Serious | -- |
| Injury Total All | 2 |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 878 |
| NTSB Notification Source | FAA COMM CENTER |
| NTSB Notification Date | Jun 9 2000 12:00AM |
| NTSB Notification Time | 1438 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | May 25 2001 4:45AM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N8321S |
| NTSB Number | SEA00LA102 |
| Missing Aircraft Indicator | N |
| 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 | Cessna |
| Aircraft Model | 182H |
| Aircraft Series Identifier | 182H |
| Aircraft Serial Number | 18256421 |
| Certified Max Gross Weight | 2800 |
| 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 | -- |
| Airframe hours since last inspection | 15 |
| Airframe Hours | -- |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | TWIN OAKS AIRPARK, INC |
| Aircraft Owner Street Address | 12405 SW RIVER RD. |
| Aircraft Owner City | HILLSBORO |
| Aircraft Owner State | OR |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 97123 |
| 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) | Other Work Use |
| Second Pilot on Board | No |
| Departure Point Same as Event | No |
| Departure Airport Code | TTD |
| Departure City | TROUTDALE |
| Departure State | OR |
| Departure Country | |
| Departure Time | 1145 |
| Departure Time Zone | PDT |
| Destination Same as Local Flt | crash at destination city |
| Destination Airport Code | 7S3 |
| Destination City | |
| Destination State | |
| Destination Country | |
| Specific Phase of Flight | -- |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | May 25 2001 4:10AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 2 |
| Runway Length | 2150 |
| Runway Width | 50 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |