Individually Owned: 150,657
Corporate Owned: 137,281
Ravalli County Airport
Aircraft Accident/Incident Report
Hamilton, Montana 59840
Monday, July 10, 2006 10:45 MDT
NTSB Narrative Summary Released at Completion of Accident
The pilot reported that while he was executing a visual flight rules extended straight-in approach to a full-stop landing, he encountered 10 knot wind fluctuations. He therefore decided to increase his approach speed by 10 knots. In addition to the increased airspeed, the pilot flew a flatter than normal approach descent angle. Due to the increased airspeed and the flatter approach, the airplane floated longer than normal after the initiation of the landing flare. Instead of executing a go-around after it became obvious that the airplane would not settle to the runway near the normal touchdown point, the pilot elected to continue the landing sequence. Once the airplane touched down, the pilot was unable to get it stopped in the remaining runway, and it departed the end of the runway and experienced a nose gear collapse after encountering rough/uneven, swampy terrain. The expected landing distance for the airplane was calculated based upon the Vref plus ten airspeed of 108 knots, a landing gross weight of 11,000 pounds, and the reported ambient weather conditions. According to those extrapolated calculations, the landing distance would have been expected to be about 3,100 feet. This distance does not include the use of thrust reversers, as the Model 560 landing performance charts for dry hard surface runways do not take into consideration use of the thrust reversers. The performance section of the Model 560 FAA-Approved flight manual stated that the landing is to be proceeded by, "...a steady three degree angle approach down to the 50-foot height point with airspeed at Vref in the landing configuration." According to Cessna Aircraft, maintaining a flatter approach, or an airspeed above designated Vref, will extend the landing distance beyond what is published in the performance tables. Review of the archived aviation surface weather observations (METAR) for Ravalli County Airport revealed that the winds measured at 1053, eight minutes after the accident, were from 150 degrees at five knots. The wind observations recorded at 0953 indicated calm winds, and the recorded winds at 0853 were 220 degrees at four knots.
NTSB Probable Cause Narrative
The pilot's failure to attain the proper touchdown point and to execute a go-around, which lead to an overrun of the runway surface. Contributing to the accident was his failure to maintain the correct landing approach speed (Vref), his failure to maintain the correct glide path, and the swampy and rough/uneven terrain the airplane encountered after departing the end of the runway.
Event Information
| Type of Event | Accident |
| Event Date | 7/10/2006 |
| Event Day of the Week | Monday |
| Time of Event | 1045 |
| Event Time Zone | Mountain Daylight Time |
| Event City | Hamilton |
| Event State | MONTANA |
| Event Country | -- |
| Zipcode of the event site | 59840 |
| Event Date Year | 2006 |
| Event Date Month | 7 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 461516N |
| Event Location Longitude | 1140731W |
| Event Location Airport | Ravalli County |
| Event Location Nearest Airport ID | 6S5 |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | 0.5 |
| Degrees magnetic from airport | -- |
| Airport Elevation | 3642 |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Pilot |
| Time of the weather observation | |
| Direction of event from weather observation facility (degrees) | -- |
| Weather Observation Facility ID | -- |
| Elevation of weather observation facility | -- |
| Distance of event from weather observation facility (units?) | -- |
| Time Zone of the weather observation | -- |
| 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) | 17 |
| Dew Point at event time (in degress fahrenheit) | -- |
| Wind Direction (degrees magnetic) | -- |
| Variable Wind Indicator | Variable |
| Wind Speed (knots) | 3 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Gusting |
| Wind Gust (knots) | 5 |
| Altimeter Setting at event time (in. Hg) | 29.86 |
| 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 | 2 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 23061 |
| NTSB Notification Source | Airport Manager |
| NTSB Notification Date | Jul 10 2006 12:00AM |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | DMS |
| Date of most recent change to record | Feb 28 2008 3:59PM |
| User who most recently changed record | NTSB\johb |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | Helena FSDO |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N50CV |
| NTSB Number | SEA06LA138 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | Yes |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Cessna |
| Aircraft Model | Citation 560 |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 560-0293 |
| Certified Max Gross Weight | 16300 |
| 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 | 9 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Continuous Airworthiness |
| Date of Last Inspection | Jun 1 2006 12:00AM |
| Airframe hours since last inspection | -- |
| Airframe Hours | 9392 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | River City Flying Service, LLC |
| Aircraft Owner Street Address | -- |
| Aircraft Owner City | Portland |
| Aircraft Owner State | OR |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 97225 |
| 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) | Executive/Corporate |
| Second Pilot on Board | No |
| Departure Point Same as Event | No |
| Departure Airport Code | KVIS |
| Departure City | Visalia |
| Departure State | CA |
| Departure Country | USA |
| Departure Time | 815 |
| Departure Time Zone | PDT |
| Destination Same as Local Flt | crash at destination city |
| Destination Airport Code | 6S5 |
| Destination City | Hamilton |
| Destination State | MT |
| Destination Country | USA |
| Specific Phase of Flight | Landing - roll |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Feb 6 2008 9:03AM |
| User who most recently changed record | STAM |
| Since inspection or accident | Last Inspection |
| Event Location Runway Number and Location | 34 |
| Runway Length | 4200 |
| Runway Width | 75 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |