# NTSB NYC67A0030: Bell 47J-2, N3939B, Dedham, MA, August 17, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 17, 1966
- Place: Dedham, MA · DEDHAM, MA
- Location: 42.2469° N, 71.1795° W: Placed by OpenAirDocs: center of Dedham, MA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.2469&lon=-71.1795&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report April 6, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 122458
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC67A0030
- Page: https://openairdocs.org/ntsb/NYC67A0030

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0719  66/8/17    DEDHAM MASS         BELL 47J-2          CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 26, 1312
        TIME - 1700                    N3939B              PX-  0  0  0  AIR TAXI-PASSG            TOTAL HOURS, 197 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: CONTROLLED                  TAKEOFF: VERTICAL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        REMARKS- ON LIFT OFF FROM LANDING PAD THE TAIL OF THE HELICOPTER DIPPED DOWN AND STRUCK THE ASPHALT SURFACE
```

## Aircraft

- Registration: [N3939B](https://openairdocs.org/deregistered/N3939B-2018-04-05), registration cancelled 2018-04-05, S/N 2846, built 1963 (OpenAirDocs)
- Reported make and model: BELL 47J-2
- Registry model: [Bell 47J-2](https://openairdocs.org/model/bell-47j-2) (registry code 1181104) (OpenAirDocs)
- Registry engine: [Lycoming VO-540 series](https://openairdocs.org/engine/lycoming-vo-540-series) (registry code 41534, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N3939B (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 NYC76AN044](https://openairdocs.org/ntsb/NYC76AN044), Oct 22, 1975: Bell 47J-2 (N3939B), Conshocken, PA, 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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