# NTSB FTW75FPM18: Bensen B-8M, N4355, Bartlesville, OK, May 18, 1975

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: May 18, 1975
- Place: Bartlesville, OK · BARTLESVILLE, OK
- Location: 36.7379° N, 95.9485° W: Placed by OpenAirDocs: center of Bartlesville, OK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.7379&lon=-95.9485&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report June 20, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 148396
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW75FPM18
- Page: https://openairdocs.org/ntsb/FTW75FPM18

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1160  75/5/18    BARTLESVILLE,OK     BENSEN B-8M         CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 49, 97 TOTAL
        TIME - 1700                    N4355               PX-  0  0  0  PLEASURE/PERSONAL TRANSP  HOURS, 11 IN TYPE, NOT
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          BARTLESVILLE,OK             LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: CRANKSHAFT
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           PILOT IN COMMAND - FAILED TO MAINTAIN ADEQUATE ROTOR R.P.M.
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- FWD CRANKSHAFT CUP PLUG DISLODGED,CAUSED INTERNAL DMG TO ENG.
```

## Aircraft

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

## 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 19750518012619A](https://openairdocs.org/incident/19750518012619A), May 18, 1975: Amtr 1300761, Bartlesville, OK, Destroyed. Fwd crankshaft cup plug dislodged,caused internal dmg to eng.

## 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 FTW80FPJ24](https://openairdocs.org/ntsb/FTW80FPJ24), Jun 20, 1980: Benson B8M (N4355), Frederick, OK, destroyed, 1 fatal
- [NTSB FTW78FPG04](https://openairdocs.org/ntsb/FTW78FPG04), Oct 22, 1977: Benson B8M (N4355), Rogers, AR, 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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