Aircraft Incident/Accident Report
Henley Aerodrome Airport

Athol, Idaho 83801
Sunday, January 23, 1983 16:25 PST

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NTSB Narrative Summary Released at Completion of Accident
THE PLT TOOKOFF WITH AN ESTIMATED 7 GAL OF FUEL ON BOARD. WHILE PERFORMING AEROBATIC MANEUVER, HE ENTERED A VERTICAL, CLIMBING, POWER-ON MANEUVER. WITNESSES REPORTED THAT THE ACFT CLIMBED TO ZERO AIRSPEED AT ABOUT 2500 FT AGL. REPORTEDLY, THE ACFT THEN SLID BACKWARD AND ENTERED AN INVERTED FLAT SPIN. POWER REMAINED ON FOR ABOUT HALF OF THE DESCENT. WHEN THE POWER WAS REDUCED, THE ACFT ENTERED AN UPRIGHT SPIN AND CONTINUED TO DESCEND IN THIS MODE UNTIL GROUND IMPACT. INTERVIEWS WITH OTHER PLTS, FAMILIAR WITH THE FLT CHARACTERISTICS OF THE PITTS, REVEALED THAT AT A LOW STATE OF FUEL, THE CENTER-OF-GRAVITY IS IN THE AFT RANGE. THEY REPORTED A POWER REDUCTION IS NECESSARY TO RECOVER FROM AN INVERTED SPIN. THEY ALSO STATED THAT INTENTIONAL SPINS WERE NOT A NORMAL PART OF THIS PLT'S AEROBATIC ROUTINE. NO MALFUNCTION OF THE ACFT OR PLT IMPAIRMENT WAS FOUND DURING THE INVESTIGATION.
NTSB Probable Cause Narrative
Not Yet Reported
Event Information
Type of EventAccident 
Event Date1/23/1983 
Event Day of the WeekSunday 
Time of Event1625 
Event Time ZonePacific Standard Time 
Event CityATHOL  
Event StateIDAHO 
Event Country-- 
Zipcode of the event site83801  
Event Date Year1983 
Event Date Month
MidAir Collision IndicatorNo 
On Ground Collision occurred ?No 
Event Location Latitude  
Event Location Longitude  
Event Location AirportHENLEY AERODROME  
Event Location Nearest Airport IDS62  
Indicates whether the acc/inc occurred off or on an airportOff Airport/Airstrip 
Distance from airport in statute miles
Degrees magnetic from airport325 
Airport Elevation2350 
Weather Briefing CompletenessUnknown 
Investigator's weather sourceWitness 
Time of the weather observation0  
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 ConditionsDay 
Lowest Ceiling Height4000 
Lowest Non-Ceiling Height
Sky/Lowest/Cloud ConditionsUnknown 
Sky Condition for Lowest CeilingBroken 
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)-- 
Wind Direction (degrees magnetic)
Variable Wind IndicatorVariable 
Wind Speed (knots)
Wind Velocity Indicator Unknown 
Wind Gust IndicatorNot Gusting 
Wind Gust (knots)
Altimeter Setting at event time (in. Hg) -- 
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)132 
NTSB Notification Source-- 
NTSB Notification Date-- 
NTSB Notification Time
Fiche Number and/or location -used to find docket information20292 
Date of most recent change to recordJan 2 2001 9:15AM 
User who most recently changed recorddbo  
Basic weather conditionsVisual Meteorological Cond 
FAA District Office-- 
Aircraft Involved
Aircraft #1
Aircraft Registration NumberN56T 
NTSB NumberSEA83FA045  
Missing Aircraft Indicator
Federal Aviation Reg. PartPart 91: General Aviation 
Type of Flight Plan filedNone 
Flight plan Was Activated?-- 
DamageDestroyed 
Aircraft FireNone 
Aircraft ExplosionNone 
Aircraft Manufacturer's Full NameCROMWELL/PITTS  
Aircraft ModelS-1S  
Aircraft Series IdentifierS-1S  
Aircraft Serial Number532-42-45391 
Certified Max Gross Weight1150 
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 InspectionAnnual 
Date of Last InspectionApr 18 1982 12:00AM 
Airframe hours since last inspection
Airframe Hours160 
ELT InstalledNo 
ELT ActivatedUnknown 
ELT Aided Location of Event SiteUnknown 
ELT Type-- 
Aircraft Owner NameNORTON AERO LIMITED  
Aircraft Owner Street AddressROUTE 1, BOX 98V  
Aircraft Owner CityATHOL  
Aircraft Owner StateID 
Aircraft Owner Country  
Aircraft Owner Zipcode83801  
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 EventYes 
Departure Airport Code  
Departure City  
Departure State  
Departure Country  
Departure Time
Departure Time Zone  
Destination Same as Local Fltdest & departure same, accident can occur anywhere 
Destination Airport Code  
Destination City  
Destination State  
Destination Country  
Specific Phase of FlightDescent 
Report sent to ICAO?-- 
Evacuation occurred-- 
Date of most recent change to recordJan 2 2001 10:36AM 
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--