# NTSB FTW80FPJ24: Benson B8M, N4355, Frederick, OK, June 20, 1980

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: June 20, 1980
- Place: Frederick, OK · FREDERICK, OK
- Location: 34.3500° N, 98.9880° W: Placed by OpenAirDocs: center of Frederick, OK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=34.3500&lon=-98.9880&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report September 11, 1980
- Report: Brief approved by the director
- NTSB case key (mKey): 130402
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW80FPJ24
- Page: https://openairdocs.org/ntsb/FTW80FPJ24

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1718  80/6/20    FREDERICK,OK        BENSON B8M          CR-  1  0  0  NONCOMMERCIAL             NO CERTIFICATE, AGE 24,
        TIME - 1430                    N4355               PX-  0  0  0  PLEASURE/PERSONAL TRANSP  130 TOTAL HOURS, ALL IN
                                       DAMAGE-DESTROYED    OT-  0  0  0                            TYPE, UNK/NR INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - FREDERICK MUNI
        DEPARTURE POINT             INTENDED DESTINATION
          FREDERICK,OK                LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - EXCEEDED DESIGNED STRESS LIMITS OF AIRCRAFT
        FACTOR(S)
           ROTORCRAFT - ROTOR ASSEMBLIES: MAIN ROTOR BLADES
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        REMARKS- OBSD IN STEEP TURNS/DIVES.MAIN ROTOR SEPD,BLADES BENT UPWARD.
```

## Aircraft

- Registration: [N4355](https://openairdocs.org/deregistered/N4355-1981-12-23), registration cancelled 1981-12-23, S/N 0071 (OpenAirDocs)
- Reported make and model: BENSON B8M
- Registry model: [Linville BENSEN B-8M](https://openairdocs.org/model/linville-bensen-b-8m) (registry code 13007WM) (OpenAirDocs)
- Category: Gyroplane, amateur-built
- Engines: reciprocating
- Damage: Destroyed
- Airport: Frederick Muni

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19800620019989A](https://openairdocs.org/incident/19800620019989A), Jun 20, 1980: Amtrbx BENSENB8M, Frederick, OK, Destroyed. Pilot performing steep turns and dives, rotor blade separated from aircraft and crash occurred.

## Other investigations on N4355 (2)

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.

- [NTSB FTW78FPG04](https://openairdocs.org/ntsb/FTW78FPG04), Oct 22, 1977: Benson B8M (N4355), Rogers, AR, substantial damage
- [NTSB FTW75FPM18](https://openairdocs.org/ntsb/FTW75FPM18), May 18, 1975: Bensen B-8M (N4355), Bartlesville, OK, substantial damage

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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