Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Goodnews, Alaska 99589
Saturday, May 22, 2004 16:05 AKD
NTSB Narrative Summary Released at Completion of Accident
The airline transport certificated pilot departed a remote airport in a twin-engine airplane. The airport is located on the coast of the Bering Sea, and has an area of low hills that are northwest of the airport. The pilot said the wind conditions were about 070 degrees magnetic at 25 knots, with gusts to 30 knots. After departure, the pilot reported that he initially climbed the airplane to about 1,200 feet, but as he approached the area of low hills, he descended to about 700 feet. At an indicated airspeed of about 185 knots, the pilot said that the airplane encountered severe turbulence for about 30 seconds, during which his radio headset was dislodged. Upon arrival at his destination, the pilot informed the director of maintenance that during the flight, the airplane encountered turbulence and appeared to have received damage to the wings. The director of maintenance reported that the airplane received structural damage that consisted of wrinkling and rippling of both of the upper wing surfaces, extending about 8 feet outboard from each engine nacelle. In addition, the elevator had wrinkling that extended about 6 inches inboard from each of the outboard hinge attach points. The closest official weather observation station is located about 32 nautical miles south of the accident site. An automated weather observation system (AWOS) was reporting in part: Wind, 110 degrees (true) at 17 knots, gusts to 27 knots; visibility, 7 statute miles; clouds and sky condition, 1,200 feet overcast.
NTSB Probable Cause Narrative
The pilot's inadequate weather evaluation which resulted in an in-flight encounter with severe turbulence, and his exceedence of the design stress limits resulting in overstress of the wings. A factor contributing to the accident was the presence of turbulence.
Event Information
| Type of Event | Accident |
| Event Date | 5/22/2004 |
| Event Day of the Week | Saturday |
| Time of Event | 1605 |
| Event Time Zone | -- |
| Event City | Goodnews |
| Event State | ALASKA |
| Event Country | -- |
| Zipcode of the event site | 99589 |
| Event Date Year | 2004 |
| Event Date Month | 5 |
| MidAir Collision Indicator | -- |
| On Ground Collision occurred ? | -- |
| Event Location Latitude | 590548N |
| Event Location Longitude | 1614300W |
| 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 | Unknown |
| 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 | 10000 |
| Lowest Non-Ceiling Height | -- |
| Sky/Lowest/Cloud Conditions | -- |
| Sky Condition for Lowest Ceiling | Overcast |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | 20 |
| Air Temperature at event time (in degrees celsius) | 10 |
| Dew Point at event time (in degress fahrenheit) | 3 |
| Wind Direction (degrees magnetic) | 70 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 25 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Gusting |
| Wind Gust (knots) | 30 |
| Altimeter Setting at event time (in. Hg) | -- |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | Light |
| 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 | 1 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 16448 |
| NTSB Notification Source | FAA PANC FSDO |
| NTSB Notification Date | Jun 2 2004 12:00AM |
| NTSB Notification Time | 1535 |
| Fiche Number and/or location -used to find docket information | DMS |
| Date of most recent change to record | Oct 28 2004 10:11AM |
| User who most recently changed record | NTSB\MONR |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | FAA-AL-ANC FSDO 03 |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N4105D |
| NTSB Number | ANC04LA059 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | Company VFR |
| Flight plan Was Activated? | No |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Piper |
| Aircraft Model | PA-31-350 |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 31-8252027 |
| Certified Max Gross Weight | 5070 |
| 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 | 9 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | AAIP |
| Date of Last Inspection | May 19 2004 12:00AM |
| Airframe hours since last inspection | 13 |
| Airframe Hours | 12446 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | Grant Aviation Inc. |
| Aircraft Owner Street Address | 4451 Aircraft Dr. |
| Aircraft Owner City | Anchorage |
| Aircraft Owner State | AK |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 99502 |
| 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 | ENHA |
| Owner has at least one certificate | -- |
| 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) | Positioning |
| Second Pilot on Board | No |
| Departure Point Same as Event | Yes |
| Departure Airport Code | GNU |
| Departure City | Goodnews |
| Departure State | AK |
| Departure Country | USA |
| Departure Time | 1600 |
| Departure Time Zone | ADT |
| Destination Same as Local Flt | -- |
| Destination Airport Code | PABE |
| Destination City | Bethel |
| Destination State | AK |
| Destination Country | USA |
| Specific Phase of Flight | Cruise |
| Report sent to ICAO? | No |
| Evacuation occurred | -- |
| Date of most recent change to record | Aug 27 2004 2:41PM |
| User who most recently changed record | PETL |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | NA |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |