# NTSB OAK70DVD28: Bensen B-8M, N8241, Tracy, CA, June 21, 1970

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 21, 1970
- Place: Tracy, CA · TRACY, CA
- Location: 37.7274° N, 121.4522° W: Placed by OpenAirDocs: center of Tracy, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.7274&lon=-121.4522&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report August 13, 1970
- Report: Brief approved by the director
- NTSB case key (mKey): 125704
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK70DVD28
- Page: https://openairdocs.org/ntsb/OAK70DVD28

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0679  70/6/21    TRACY,CALIF         BENSEN B-8M         CR-  0  0  1  INSTRUCTIONAL             STUDENT, AGE 46, 955
        TIME - 1000                    N8241               PX-  0  0  0  TRAINING                  TOTAL HOURS, 188 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - TRACY
        DEPARTURE POINT             INTENDED DESTINATION
          TRACY,CALIF                 TRACY,CALIF
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           UNDERSHOOT                                               LANDING: FINAL APPROACH
           HARD LANDING                                             LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - MISJUDGED DISTANCE,SPEED,AND ALTITUDE
```

## Aircraft

- Registration: [N8241](https://openairdocs.org/deregistered/N8241-1993-04-08), registration cancelled 1993-04-08, S/N A1443 (OpenAirDocs)
- Reported make and model: BENSEN B-8M
- Registry model: [Bensen Gyrocopter B-8MJ](https://openairdocs.org/model/bensen-gyrocopter-b-8mj) (registry code 130070H) (OpenAirDocs)
- Category: Gyroplane, amateur-built
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Tracy

## Other investigations on N8241 (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 LAX91LA359](https://openairdocs.org/ntsb/LAX91LA359), Aug 15, 1991: Benson/Ambrocini/Wentzel B-8MJ (N8241), Turlock, CA, substantial damage, 1 fatal. Probable cause: THE PILOT'S OVER ROTATION OF THE GYROCOPTER DURING THE TAKEOFF SEQUENCE WHICH RESULTED IN A LOSS OF CONTROL. CONTRIBUTING TO THE ACCIDENT WAS THE POOR MAINTENANCE PRACTICES PERFORMED ON THE MACHINE.

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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