# NTSB FTW80DRG11: Enstrom F-28C, N51759, Port Mansfield, TX, December 7, 1979

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: December 7, 1979
- Place: Port Mansfield, TX · PORT MANSFIELD, TX
- Location: 26.5694° N, 97.4423° W: Placed by OpenAirDocs: center of Port Mansfield, TX, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=26.5694&lon=-97.4423&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report January 17, 1980
- Report: Brief approved by the director
- NTSB case key (mKey): 133575
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW80DRG11
- Page: https://openairdocs.org/ntsb/FTW80DRG11

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2977   79/12/7 NR.PORT MANSFIELD,TX  ENSTROM F-28C       CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, AGE 36, 667
        TIME - 0915                    N51759              PX-  0  0  1  CORP/EXEC                 TOTAL HOURS, 105 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         PORT MANSFIELD,TX            LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: NORMAL CRUISE
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF POWERPLANT & POWERPLANT CONTROLS
           PILOT IN COMMAND - FAILED TO MAINTAIN ADEQUATE ROTOR R.P.M.
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- MANUALLY OPERATED CLUTCH(BETWEEN ENG & TRANSMISSION)FOUND IN DISENGAGED POSITION.
```

## Aircraft

- Registration: [N51759](https://openairdocs.org/deregistered/N51759-1999-03-12), registration cancelled 1999-03-12, S/N 441 (OpenAirDocs)
- Reported make and model: ENSTROM F-28C
- Registry model: [Enstrom F-28C](https://openairdocs.org/model/enstrom-f-28c) (registry code 3300407) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## 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 19791207033639A](https://openairdocs.org/incident/19791207033639A), Dec 7, 1979: Enstrm F28C, Port Mansfield, TX, Substantial damage. Lost rotor RPM. Made hard auto rotate landing. Found auto drive clutch had disengaged.

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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