# NTSB FTW68A0040: Bensen B8M, N9171, Yukon, OK, October 10, 1967

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: October 10, 1967
- Place: Yukon, OK · YUKON, OK
- Location: 35.5184° N, 97.7662° W: Placed by OpenAirDocs: center of Yukon, OK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=35.5184&lon=-97.7662&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report January 30, 1968
- Report: Brief approved by the director
- NTSB case key (mKey): 113526
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW68A0040
- Page: https://openairdocs.org/ntsb/FTW68A0040

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0876  67/10/10   YUKON,OKLA          BENSEN B8M          CR-  1  0  0  NONCOMMERCIAL             COMMERCIAL, AGE 38, 3993
        TIME - 1705                    N9171               PX-  0  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 4 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - CIMMARRON
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: MAIN ROTOR                      IN FLIGHT: OTHER
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           ROTORCRAFT - ROTOR ASSEMBLIES: MAIN ROTOR HEAD ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: POOR/INADEQUATE DESIGN
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        REMARKS- OFFSET GIMBAL CONTROL HEAD ALUMINUM TORQUE TUBE,6063 T-5,FAILED.LOCAL FLIGHT AROUND AIRFIELD.
```

## Aircraft

- Registration: [N9171](https://openairdocs.org/deregistered/N9171-1968-01-17), registration cancelled 1968-01-17, S/N 1 (OpenAirDocs)
- Reported make and model: BENSEN B8M
- Registry model: [Paddock B-8M](https://openairdocs.org/model/paddock-b-8m) (registry code 130076D) (OpenAirDocs)
- Category: Gyroplane, amateur-built
- Engines: reciprocating
- Damage: Destroyed
- Airport: Cimmarron

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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