# NTSB MKC69F0237: Bensen B8-M, N1802, Anoka, MN, October 21, 1968

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: October 21, 1968
- Place: Anoka, MN · ANOKA, MN
- Location: 45.2144° N, 93.3916° W: Placed by OpenAirDocs: center of Anoka, MN, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=45.2144&lon=-93.3916&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report December 27, 1968
- Report: Brief approved by the director
- NTSB case key (mKey): 108003
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC69F0237
- Page: https://openairdocs.org/ntsb/MKC69F0237

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3755  68/10/21   ANOKA,MINN          BENSEN B8-M         CR-  0  0  1  INSTRUCTIONAL             STUDENT, AGE 48, 21 TOTAL
        TIME - 1010                    N1802               PX-  0  0  0  TRAINING                  HOURS, 3 IN TYPE, NOT
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        NAME OF AIRPORT - ANOKA COUNTY
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            LANDING: TRAFFIC PATTERN-CIRCLING
           HARD LANDING                                             LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: PISTON,PISTON RINGS
           MISCELLANEOUS ACTS,CONDITIONS - EXCESSIVE TEMPERATURE
           POWERPLANT - IGNITION SYSTEM: SPARK PLUG
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPER MAINTENANCE (OWNER PERSONNEL)
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING ON AIRPORT/SEAPLANE BASE/HELIPT.
        REMARKS- NO 4 CYL PISTON SEIZED DUE TO PRE-IGNITION CAUSED BY SPARK PLUGS WITH IMPROPER HEAT RANGE FOR ENG.
```

## Aircraft

- Registration: [N1802](https://openairdocs.org/deregistered/N1802-1999-05-15), registration cancelled 1999-05-15, S/N 37566521 (OpenAirDocs)
- Reported make and model: BENSEN B8-M
- Registry model: [Bensen B-8M](https://openairdocs.org/model/bensen-b-8m) (registry code 1300516) (OpenAirDocs)
- Category: Gyroplane, amateur-built
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Anoka County

## Other investigations on N1802 (1)

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 MKC70FDM09](https://openairdocs.org/ntsb/MKC70FDM09), Jan 31, 1970: Bensen B-8M (N1802), Lake Elmo, MN, 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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