Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Bethel, Alaska 99559
Friday, May 29, 1998 15:57 AKD
NTSB Narrative Summary Released at Completion of Accident
During climb to cruise while passing 2,000 feet msl, the engine lost total power. The airplane nosed onto its back during the subsequent forced landing in marshy tundra. Postaccident inspection revealed wear between the throttle arm and the connecting hardware bushing. The throttle control lever had disconnected from the throttle arm. Service Bulletin SEB95-15R1, 'Throttle Lever Inspection,' that required a visual inspection for wear between the arm and bushing each 50 hours or 12 months, had been complied with 56 hours, 163 hours, and 268 hours prior to the accident by company mechanics. The newly overhauled engine was installed 334 hours prior to the accident.
NTSB Probable Cause Narrative
The throttle arm disconnecting from the throttle linkage to the engine as a result of inadequate inspection by company maintenance personnel. Factors associated with this accident were the company maintenance personnel not following the repetitive Service Bulletin inspection, and the inadequate design of the throttle arm by the manufacturer.
Event Information
| Type of Event | Accident |
| Event Date | 5/29/1998 |
| Event Day of the Week | Friday |
| Time of Event | 1557 |
| Event Time Zone | -- |
| Event City | BETHEL |
| Event State | ALASKA |
| Event Country | -- |
| Zipcode of the event site | 99559 |
| Event Date Year | 1998 |
| Event Date Month | 5 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | -- |
| Event Location Longitude | -- |
| Event Location Airport | |
| Event Location Nearest Airport ID | |
| 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 | -- |
| Weather Briefing Completeness | Not pertinent |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1608 Atlantic Daylight Time |
| Direction of event from weather observation facility (degrees) | 350 |
| Weather Observation Facility ID | BET |
| Elevation of weather observation facility | 123 |
| Distance of event from weather observation facility (units?) | 10 |
| Time Zone of the weather observation | ADT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 6500 |
| Lowest Non-Ceiling Height | 0 |
| Sky/Lowest/Cloud Conditions | Unknown |
| Sky Condition for Lowest Ceiling | Broken |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 40 |
| Air Temperature at event time (in degrees celsius) | 15 |
| Dew Point at event time (in degress fahrenheit) | 7 |
| Wind Direction (degrees magnetic) | 90 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 13 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 29 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | Light |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 1 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 618 |
| NTSB Notification Source | -- |
| NTSB Notification Date | May 29 1998 12:00AM |
| NTSB Notification Time | 1620 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Feb 26 2001 8:04AM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N9956M |
| NTSB Number | ANC98LA059 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 135: Air Taxi & Commuter |
| Type of Flight Plan filed | Company VFR |
| Flight plan Was Activated? | -- |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Cessna |
| Aircraft Model | 207 |
| Aircraft Series Identifier | 207 |
| Aircraft Serial Number | 20700763 |
| Certified Max Gross Weight | 3800 |
| 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 | 6 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | AAIP |
| Date of Last Inspection | May 8 1998 12:00AM |
| Airframe hours since last inspection | 56 |
| Airframe Hours | 11610 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | ARCTIC TRANSPORTATION SERVICE |
| Aircraft Owner Street Address | 5701 SILVERADO WAY; UNIT L |
| Aircraft Owner City | ANCHORAGE |
| Aircraft Owner State | AK |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 99518 |
| 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 | UATA |
| Owner has at least one certificate | Yes - certificate holder |
| 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 | Non-scheduled |
| Indicates Domestic or International Flight | Domestic |
| Operator carrying Pax/Cargo/Mail | Cargo |
| Type of Flying (Per_Bus / Primary) | Unknown |
| Second Pilot on Board | No |
| Departure Point Same as Event | Yes |
| Departure Airport Code | BET |
| Departure City | |
| Departure State | |
| Departure Country | |
| Departure Time | 1555 |
| Departure Time Zone | ADT |
| Destination Same as Local Flt | -- |
| Destination Airport Code | AK45 |
| Destination City | TUNUNAK |
| Destination State | AK |
| Destination Country | |
| Specific Phase of Flight | -- |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Feb 26 2001 8:04AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 0 |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |