# NTSB CHI71DEC60: Bensen B8M, N3671, Monroe, MI, June 27, 1971

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 27, 1971
- Place: Monroe, MI · MONROE, MI
- Location: 41.9166° N, 83.3843° W: Placed by OpenAirDocs: center of Monroe, MI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.9166&lon=-83.3843&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report November 29, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 161158
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI71DEC60
- Page: https://openairdocs.org/ntsb/CHI71DEC60

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0507  71/6/27    MONROE,MICH         BENSEN B8M          CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 45, 225
        TIME - 1730                    N3671               PX-  0  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 42 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          GROSSE ISLE,MICH            LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           HARD LANDING                                             LANDING: ROLL-ON/RUN-ON
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: CYLINDER ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - OVERHEATED
           PILOT IN COMMAND - MISJUDGED SPEED AND ALTITUDE
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- ACFT FLOWN CONTSLY FOR 3 HRS.CYLINDERS UNBAFFLED
```

## Aircraft

- Registration: [N3671](https://openairdocs.org/deregistered/N3671-2011-01-12), registration cancelled 2011-01-12, S/N 1942, built 1969 (OpenAirDocs)
- Reported make and model: BENSEN B8M
- Registry model: [David P Mioduch B-8M](https://openairdocs.org/model/david-p-mioduch-b-8m) (registry code 13007HJ) (OpenAirDocs)
- Registry engine: [Mcculloch 4318A&E/0-100](https://openairdocs.org/engine/mcculloch-4318a-e-0-100) (registry code 43101, reciprocating) (OpenAirDocs)
- Category: Gyroplane, amateur-built
- Engines: reciprocating
- Damage: 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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