Aircraft Incident/Accident Report
Stilwell/Cherokee Nation Airport

Stilwell, Oklahoma 74960
Thursday, March 20, 1997 17:35 CST

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NTSB Narrative Summary Released at Completion of Accident
The pilot (plt) departed Cookson, OK, in a homebuilt aircraft (acft) for an approximate 30 minute flight to Stilwell, OK. Witnesses at Stilwell said he made a low pass on a northerly heading (about 50 ft off the ground) at a high rate of speed. One witness estimated the acft was traveling faster than 200 mph, when he saw the acft's right wing skin separate from the acft. The right wing then came off. The acft was observed to roll several times & travel about 1100 ft before it impacted the ground. Postimpact examination of the wreckage revealed a fracture in the wing spar about 18 inches in from the right wing tip. There was a discoloration in the fracture, which had the appearance of a varnish like substance. An FAA inspector reported that 'there were different color glue joints in the wing construction indicating that there were different kinds of glue used.' Also, the failure mode differed; the dark glue joints failed in the wooden structure, where as, the other glue joints failed in the bond. Some of the wing joints that had failed had discoloration between the rib & the wooden skin. The inspector suggested that 'either improper clamping during construction, prevarnishing of the contact surfaces, or bond separation followed by moisture weathering could have caused this.' The plt had purchased the homebuilt acft on 10/1/96. It had been originally certificated for flight on 10/27/72. On 2/11/73, it had been damaged during a takeoff mishap, & 'new wing construction' had been performed.
NTSB Probable Cause Narrative
failure of the right wing spar and/or debonding of the right wing skin, which resulted in separation of the wing skin and a portion of the right wing, during high speed flight. Factors related to the accident were: previous wing damage and inadequate maintenance by other (unknown) personnel.
Event Information
Type of EventAccident 
Event Date3/20/1997 
Event Day of the WeekThursday 
Time of Event1735 
Event Time ZoneCentral Standard Time 
Event CitySTILWELL  
Event StateOKLAHOMA 
Event Country-- 
Zipcode of the event site74960  
Event Date Year1997 
Event Date Month
MidAir Collision IndicatorNo 
On Ground Collision occurred ?No 
Event Location Latitude  
Event Location Longitude  
Event Location Nearest Airport IDO11  
Indicates whether the acc/inc occurred off or on an airportOn Airport 
Distance from airport in statute miles-- 
Degrees magnetic from airport-- 
Airport Elevation-- 
Weather Briefing CompletenessUnknown 
Investigator's weather sourceWeather Observation Facility 
Time of the weather observation1653 Central Standard Time 
Direction of event from weather observation facility (degrees)155 
Weather Observation Facility IDFSM  
Elevation of weather observation facility469 
Distance of event from weather observation facility (units?)25 
Time Zone of the weather observationCST 
Lighting ConditionsDay 
Lowest Ceiling Height
Lowest Non-Ceiling Height
Sky/Lowest/Cloud ConditionsClear 
Sky Condition for Lowest CeilingNone 
Visibility Runway Visual Range (Feet)
Visibility Runway Visual Value (Statute Miles)
Visibility (Statute Miles) 10 
Air Temperature at event time (in degrees celsius)22 
Dew Point at event time (in degress fahrenheit)
Wind Direction (degrees magnetic)270 
Variable Wind IndicatorUnknown 
Wind Speed (knots)10 
Wind Velocity Indicator Unknown 
Wind Gust IndicatorUnknown 
Wind Gust (knots)
Altimeter Setting at event time (in. Hg) 29 
Density Altitude (feet)-- 
Intensity of PrecipitationUnknown 
METAR weather report -- 
Event Highest InjuryFatal 
On Ground, Fatal Injuries
On Ground, Minor Injuries
On Ground, Serious Injuries
Injury Total Fatal
Injury Total Minor-- 
Injury Total None-- 
Injury Total Serious-- 
Injury Total All
Investigating AgencyNTSB 
NTSB Docket Number (internal use)557 
NTSB Notification Source-- 
NTSB Notification DateMar 24 1997 12:00AM 
NTSB Notification Time746 
Fiche Number and/or location -used to find docket informationIMAGE 
Date of most recent change to recordDec 8 2000 12:09PM 
User who most recently changed recorddbo  
Basic weather conditionsVisual Meteorological Cond 
FAA District Office-- 
Aircraft Involved
Aircraft #1
Aircraft Registration NumberN86T 
NTSB NumberFTW97FA135  
Missing Aircraft Indicator
Federal Aviation Reg. PartPart 91: General Aviation 
Type of Flight Plan filedNone 
Flight plan Was Activated?-- 
Aircraft FireNone 
Aircraft ExplosionNone 
Aircraft Manufacturer's Full NameTeschendorf  
Aircraft ModelCASSUTT SPORT  
Aircraft Series IdentifierCASSUTT SP 
Aircraft Serial NumberT1  
Certified Max Gross Weight929 
Aircraft CategoryAirplane 
Aircraft Registration ClassU.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
Number of Engines
Fixed gear or retractable gearFixed 
Aircraft, Type of Last InspectionUnknown 
Date of Last Inspection-- 
Airframe hours since last inspection-- 
Airframe Hours-- 
ELT InstalledNo 
ELT ActivatedUnknown 
ELT Aided Location of Event SiteUnknown 
ELT Type-- 
Aircraft Owner NameDANIEL K. STONE  
Aircraft Owner Street AddressHC 73, BOX 56-1A  
Aircraft Owner CityPARK HILL  
Aircraft Owner StateOK 
Aircraft Owner Country  
Aircraft Owner Zipcode74451  
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  
Owner has at least one certificateNone 
Other Operator of large aircraft?No 
Certified for Part 133 or 137 OperationUnknown 
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 BoardNo 
Departure Point Same as EventNo 
Departure Airport Code44M  
Departure CityCOOKSON  
Departure StateOK 
Departure Country  
Departure Time1705 
Departure Time ZoneCST 
Destination Same as Local Fltcrash at destination city 
Destination Airport Code011  
Destination City  
Destination StateOK 
Destination Country  
Specific Phase of FlightManeuvering 
Report sent to ICAO?-- 
Evacuation occurred-- 
Date of most recent change to recordJan 2 2001 10:34AM 
User who most recently changed recorddbo  
Since inspection or accident-- 
Event Location Runway Number and Location0  
Runway Length-- 
Runway Width-- 
Sight Seeing flightNo 
Air Medical FlightNo 
Medical Flight--