# NTSB OAK71DVA40: Bell 47G3B1, N7901S, Grant Cove, CA, November 19, 1970

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: November 19, 1970
- Place: Grant Cove, CA · GRANT COVE, CA
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report October 8, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 159611
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK71DVA40
- Page: https://openairdocs.org/ntsb/OAK71DVA40

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4528  70/11/19   GRANT COVE,CALIF    BELL 47G3B1         CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 37, 4554
        TIME - 1415                    N7901S              PX-  0  0  0  CTR CARGO-D               TOTAL HOURS, 2000 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          GRANT COVE,CALIF            CEDAR GROVE,CALIF
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            TAKEOFF: VERTICAL
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           POWERPLANT - MISCELLANEOUS: POWERPLANT FAILURE FOR UNDETERMINED REASONS
           INSTRUMENTS/EQUIPMENT AND ACCESSORIES - MISCELLANEOUS EQUIPMENT: PICK-UP EQUIPMENT
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - LOAD NOT JETTISONED
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- LOST PWR FOR UNDET REASON.TRIED TO RELEASE SLING LOAD,SAID SWITCH MALFUNCTIONED.SLING CAUGHT ROCK.
```

## Aircraft

- Registration: [N7901S](https://openairdocs.org/deregistered/N7901S-2018-01-09), registration cancelled 2018-01-09, S/N 6576 (OpenAirDocs)
- Reported make and model: BELL 47G3B1
- Registry model: [Bell 47G-3B-1](https://openairdocs.org/model/bell-47g-3b-1) (registry code 1181028) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N7901S (3)

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 FTW98TA099](https://openairdocs.org/ntsb/FTW98TA099), Jan 15, 1998: Bell 47G-3B-1 (N7901S), Magdalena, NM, substantial damage. Probable cause: The pilot's failure to maintain adequate main rotor rpm. A factor was a lack of recent experience in the type of operation being performed.
- [NTSB LAX80DUK06](https://openairdocs.org/ntsb/LAX80DUK06), Sep 24, 1980: Bell 47G3B1 (N7901S), Seligam, AZ, destroyed
- [NTSB ANC76AA112](https://openairdocs.org/ntsb/ANC76AA112), Jul 17, 1976: Bell 47G3B1 (N7901S), Petersburg, AK, destroyed, 2 fatal

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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