Individually Owned: 150,657
Corporate Owned: 137,281
Wyoming Valley Airport
Aircraft Accident/Incident Report
Forty Fort, Pennsylvania 18704
Friday, June 9, 2000 8:50 EDT
NTSB Narrative Summary Released at Completion of Accident
During takeoff, approximately 150 above the ground, the propeller reduction gearbox input shaft failed, and the airplane lost all power. The pilot performed a forced landing to a field where the airplane struck a fence. After reviewing the wreckage, the pilot stated that he machined his own shaft for the home built airplane. He stated that he machined the shaft too thin, and after about 150 hours of operation, it failed at its weakest point. The kit manufacturer stated that the production model shafts are larger, and used aviation splines, whereas the accident airplane had a smaller shaft that used automotive splines.
NTSB Probable Cause Narrative
The owner/builder's inadequate design, resulting in total failure of the reduction gear assembly accessory drive shaft.
Event Information
| Type of Event | Accident |
| Event Date | 6/9/2000 |
| Event Day of the Week | Friday |
| Time of Event | 850 |
| Event Time Zone | Eastern Daylight Time |
| Event City | FORTY FORT |
| Event State | PENNSYLVANIA |
| Event Country | -- |
| Zipcode of the event site | 18704 |
| Event Date Year | 2000 |
| Event Date Month | 6 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 411749N |
| Event Location Longitude | 0755104W |
| Event Location Airport | WYOMING VALLEY AIRPORT |
| Event Location Nearest Airport ID | WBW |
| 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 | 545 |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 854 Eastern Daylight Time |
| Direction of event from weather observation facility (degrees) | 60 |
| Weather Observation Facility ID | AVP |
| Elevation of weather observation facility | 956 |
| Distance of event from weather observation facility (units?) | 6 |
| Time Zone of the weather observation | EDT |
| 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) | 23 |
| Dew Point at event time (in degress fahrenheit) | 14 |
| Wind Direction (degrees magnetic) | 220 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 10 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | 30.05 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | -- |
| Event Highest Injury | Minor |
| On Ground, Fatal Injuries | -- |
| On Ground, Minor Injuries | -- |
| On Ground, Serious Injuries | -- |
| Injury Total Fatal | -- |
| Injury Total Minor | 1 |
| Injury Total None | -- |
| Injury Total Serious | -- |
| Injury Total All | 1 |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 14476 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Jun 9 2000 12:00AM |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | DMS |
| Date of most recent change to record | Nov 25 2003 11:36AM |
| User who most recently changed record | NTSB\MONR |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | ALLENTOWN |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N51FY |
| NTSB Number | NYC00LA156 |
| 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 | STEWART |
| Aircraft Model | S-51 |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | 001 |
| Certified Max Gross Weight | 3694 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | U.S. Registered/U.S. Soil |
| Aircraft is a homebuilt? | Yes |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 2 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Annual |
| Date of Last Inspection | -- |
| Airframe hours since last inspection | -- |
| Airframe Hours | 150 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | FRANK YAMRICK |
| Aircraft Owner Street Address | 89 WEST 3RD STREET |
| Aircraft Owner City | WEST WYOMING |
| Aircraft Owner State | PA |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 18644 |
| Operator is an individual? | No |
| Operator Name | Frank Yamrick |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | -- |
| Operator City | West Wyoming |
| Operator State | PA |
| Operator Country | USA |
| Operator Zip code | 18644 |
| 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) | Personal |
| Second Pilot on Board | No |
| Departure Point Same as Event | Yes |
| Departure Airport Code | WBW |
| Departure City | FORTY FORT |
| Departure State | PA |
| Departure Country | USA |
| Departure Time | 850 |
| Departure Time Zone | EDT |
| Destination Same as Local Flt | dest & departure same, accident can occur anywhere |
| Destination Airport Code | -- |
| Destination City | -- |
| Destination State | -- |
| Destination Country | -- |
| Specific Phase of Flight | Takeoff |
| Report sent to ICAO? | No |
| Evacuation occurred | No |
| Date of most recent change to record | Oct 8 2003 10:22AM |
| User who most recently changed record | PEAR |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | 25 |
| Runway Length | 3376 |
| Runway Width | 75 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |