Individually Owned: 150,657
Corporate Owned: 137,281
Tacoma Narrows Airport
Aircraft Accident/Incident Report
Tacoma, Washington 98335
Friday, May 30, 2008 11:00 PDT
NTSB Narrative Summary Released at Completion of Accident
After landing and during the roll out the right main landing gear collapsed. An examination of the landing gear revealed that the right main landing gear inboard clevis, which serves as the connection between the inboard hydraulic actuating cylinder to the main landing gear body, had failed. A metallurgical examination of the clevis fracture region revealed that it had failed in overstress. No preexisting cracks or corrosion were noted at the fracture and the laboratory could not determine an underlying reason for the overstress fracture. The main landing gear is retained in the down and locked position by hydraulic pressure being applied to the inboard main landing gear actuating cylinder, as well as being assisted by the outboard main landing gear (hydraulic-pneumatic) actuating cylinder. Additionally, bungee cords attached to the main landing gear drag braces assures that the main landing gear is locked and retained in the down position. As a result of these redundant features that are designed to ensure that the main landing gear is locked in the down position, the gear collapse cannot be positively attributed to the failure of the clevis. During a post accident examination of the right main landing gear a replacement clevis was installed and multiple landing gear extension and retraction cycles were performed. The landing gear system, including the proper sequencing of all components, operated correctly and no anomalies were noted. The reason for the landing gear collapse was undetermined.
NTSB Probable Cause Narrative
The collapse of the right main landing gear for undetermined reasons.
Event Information
| Type of Event | Accident |
| Event Date | 5/30/2008 |
| Event Day of the Week | Friday |
| Time of Event | 1100 |
| Event Time Zone | Pacific Daylight Time |
| Event City | Tacoma |
| Event State | WASHINGTON |
| Event Country | -- |
| Zipcode of the event site | 98335 |
| Event Date Year | 2008 |
| Event Date Month | 5 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 471604N |
| Event Location Longitude | 1223441W |
| Event Location Airport | Tacoma Narrows |
| Event Location Nearest Airport ID | TIW |
| 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 | 294 |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1753 Pacific Daylight Time |
| Direction of event from weather observation facility (degrees) | -- |
| Weather Observation Facility ID | TIW |
| Elevation of weather observation facility | 294 |
| Distance of event from weather observation facility (units?) | -- |
| Time Zone of the weather observation | PDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 3100 |
| Lowest Non-Ceiling Height | -- |
| Sky/Lowest/Cloud Conditions | Clear |
| Sky Condition for Lowest Ceiling | Overcast |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 11 |
| Dew Point at event time (in degress fahrenheit) | 4 |
| Wind Direction (degrees magnetic) | -- |
| Variable Wind Indicator | Variable |
| Wind Speed (knots) | -- |
| Wind Velocity Indicator | Calm |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | 30.2 |
| 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) | 24910 |
| NTSB Notification Source | Regional Operations Center |
| NTSB Notification Date | May 30 2008 12:00AM |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | -- |
| Date of most recent change to record | Jan 26 2009 9:26AM |
| User who most recently changed record | grol |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | Seattle, Washington |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N115AB |
| NTSB Number | SEA08LA147 |
| 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 | AERO COMMANDER |
| Aircraft Model | 690A |
| Aircraft Series Identifier | A |
| Aircraft Serial Number | 11231 |
| Certified Max Gross Weight | 10325 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | -- |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | 2 |
| Cabin Crew Seats | -- |
| Passenger Seats | 4 |
| Total number of seats on the aircraft | 6 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | 100 Hour |
| Date of Last Inspection | Oct 16 2007 12:00AM |
| Airframe hours since last inspection | 0.7 |
| Airframe Hours | 7673.1 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | Unknown |
| Aircraft Owner Name | Daedalus Enterprises LLC |
| Aircraft Owner Street Address | -- |
| Aircraft Owner City | Great Falls |
| Aircraft Owner State | MT |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 59401 |
| Operator is an individual? | No |
| Operator Name | Thomas D Klemans |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | -- |
| Operator City | Tacoma |
| Operator State | WA |
| Operator Country | USA |
| Operator Zip code | 98075 |
| Operator Code | -- |
| Owner has at least one certificate | None |
| Other Operator of large aircraft? | No |
| 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 | Yes |
| Departure Point Same as Event | Yes |
| Departure Airport Code | TIW |
| Departure City | Tacoma |
| Departure State | WA |
| Departure Country | USA |
| Departure Time | 1000 |
| Departure Time Zone | PDT |
| Destination Same as Local Flt | dest & departure same, accident can occur anywhere |
| Destination Airport Code | TIW |
| Destination City | Tacoma |
| Destination State | WA |
| Destination Country | USA |
| Specific Phase of Flight | Landing - roll |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jan 8 2009 2:23PM |
| User who most recently changed record | stam |
| Since inspection or accident | Last Inspection |
| Event Location Runway Number and Location | 17 |
| Runway Length | 5002 |
| Runway Width | 150 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |