# NTSB DEN78FTE80: Bell 47G3B2, N7927J, Mesa, CO, July 28, 1978

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 28, 1978
- Place: Mesa, CO · MESA, CO
- Location: 39.1664° N, 108.1390° W: Placed by OpenAirDocs: center of Mesa, CO, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.1664&lon=-108.1390&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report June 9, 1979
- Report: Brief approved by the director
- NTSB case key (mKey): 140515
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN78FTE80
- Page: https://openairdocs.org/ntsb/DEN78FTE80

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4479  78/7/28    MESA,CO             BELL 47G3B2         CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 45, 531
        TIME - 0715                    N7927J              PX-  0  0  0  ASSOC CROP CTL ACTIVITY   TOTAL HOURS, 331 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          MESA,CO                     LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: EN ROUTE TO TREAT CROP
           GEAR COLLAPSED                                           LANDING: POWER-ON LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: VALVE ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - LOW COMPRESSION
        FACTOR(S)
           TERRAIN - ROUGH/UNEVEN
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- ENG NOT APPROVED FOR MODEL HELICOPTER.NO 2 CYL 0/80 INTAKE VALVE LEAKAGE.
```

## Aircraft

- Registration: [N7927J](https://openairdocs.org/deregistered/N7927J-1996-05-10), registration cancelled 1996-05-10, S/N 6798 (OpenAirDocs)
- Reported make and model: BELL 47G3B2
- Registry model: [Bell 47G-3B-2](https://openairdocs.org/model/bell-47g-3b-2) (registry code 1181029) (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 19780728042889A](https://openairdocs.org/incident/19780728042889A), Jul 28, 1978: Bell 47G3B2, Mesa, CO, Substantial damage. Engine lost power. Made hard landing. Cut off tail boom. Improper engine installed. Leaky and stuck valves.

## Other investigations on N7927J (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 SEA85LA022](https://openairdocs.org/ntsb/SEA85LA022), Nov 25, 1984: Bell 47G-3B-2 (N7927J), Nampa, ID, 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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