# NTSB CHI66A0007: Enstrom F-28, N40043, Marquette, MI, July 11, 1965

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 11, 1965
- Place: Marquette, MI · MARQUETTE, MI
- Location: 46.5507° N, 87.3958° W: Placed by OpenAirDocs: center of Marquette, MI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=46.5507&lon=-87.3958&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report October 15, 1965
- Report: Brief approved by the director
- NTSB case key (mKey): 177209
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI66A0007
- Page: https://openairdocs.org/ntsb/CHI66A0007

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0496  65/7/11    MARQUETTE MICH      ENSTROM F-28        CR-  0  0  1  MISCELLANEOUS             COMMERCIAL, FL.INSTR.,
        TIME - 1308                    N40043              PX-  0  0  1  DEMONSTRATION             AGE 35, 5100 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            332 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - MARQUETTE CO.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      LANDING: TRAFFIC PATTERN-CIRCLING
        PROBABLE CAUSE(S)
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: POOR/INADEQUATE DESIGN
           ROTORCRAFT - ROTOR ASSEMBLIES: TAIL ROTOR BLADES
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        EMERGENCY CIRCUMSTANCES - FORCED LANDING ON AIRPORT/SEAPLANE BASE/HELIPT.
                                  DIRECTIONAL CONTROL PROBLEM
        REMARKS- ENTIRE TAIL ROTOR ASSEMBLY SEPARATED FROM THE PROTOTYPE ROTORCRAFT-BLADE GRIP ATTACH SCREWS FAILED
```

## Aircraft

- Registration: [N40043](https://openairdocs.org/deregistered/N40043-1997-10-09), registration cancelled 1997-10-09, S/N 003 (OpenAirDocs)
- Reported make and model: ENSTROM F-28
- Registry model: [Enstrom F-28](https://openairdocs.org/model/enstrom-f-28) (registry code 3300404) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Marquette Co.

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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