# NTSB LAX74DUG42: Bensen B8M, N4341, Corona, CA, February 10, 1974

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: February 10, 1974
- Place: Corona, CA · CORONA, CA
- Location: 33.8753° N, 117.5664° W: Placed by OpenAirDocs: center of Corona, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=33.8753&lon=-117.5664&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report April 9, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 186997
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX74DUG42
- Page: https://openairdocs.org/ntsb/LAX74DUG42

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0262  74/2/10    CORONA,CALIF        BENSEN B8M          CR-  1  0  0  NONCOMMERCIAL             STUDENT, AGE 47, UNK/NR
        TIME - 1610                    N4341               PX-  0  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, UNK/NR IN
                                       DAMAGE-DESTROYED    OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - CORONA
        DEPARTURE POINT             INTENDED DESTINATION
          CORONA,CALIF                LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: MAIN ROTOR                      TAKEOFF: INITIAL CLIMB
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           ROTORCRAFT - ROTOR ASSEMBLIES: MAIN ROTOR HEAD ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPER CLEARANCE-TOLERANCE
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY INSTALLED
        REMARKS- IMPROP MODIFIED ROTOR HEAD CAUSED SEIZURE.
```

## Aircraft

- Registration: [N4341](https://openairdocs.org/deregistered/N4341-2011-04-11), registration cancelled 2011-04-11, S/N GB-100, built 1968 (OpenAirDocs)
- Reported make and model: BENSEN B8M
- Registry model: [Bensen GERBRAND-BENSEN](https://openairdocs.org/model/bensen-gerbrand-bensen) (registry code 13007GB) (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: Destroyed
- Airport: Corona

## 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 19740210003239A](https://openairdocs.org/incident/19740210003239A), Feb 10, 1974: Amtr 1300761, Corona, CA, Substantial damage. Improp modified rotor head caused seizure.

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.