# NTSB SEA71FWA09: Bell 47G-4A, N7939S, Estacada, OR, August 10, 1970

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 10, 1970
- Place: Estacada, OR · ESTACADA, OR
- Location: 45.2982° N, 122.3324° W: Placed by OpenAirDocs: center of Estacada, OR, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=45.2982&lon=-122.3324&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report June 11, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 110780
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA71FWA09
- Page: https://openairdocs.org/ntsb/SEA71FWA09

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3217  70/8/10    ESTACADA,OREG       BELL 47G-4A         CR-  0  0  1  COMMERCIAL                COMMERCIAL, FL.INSTR.,
        TIME - 1000                    N7939S              PX-  0  0  2  CTR PASSG-D               AGE 27, 1600 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            1000 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - BURNT GRANITE FS
        DEPARTURE POINT             INTENDED DESTINATION
          USFS RANGER STA             ESTACADA,OREG
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: LOW PASS
           COLLIDED WITH: OBJECT                                    LANDING: POWER-ON LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - MISCELLANEOUS: POWERPLANT FAILURE FOR UNDETERMINED REASONS
           TERRAIN - HIGH VEGETATION
           TERRAIN - HIDDEN OBSTRUCTIONS
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING OFF AIRPORT
        REMARKS- USFS CONTRACT FLT. ENG LOST PWR FOR UNDET REASON. L SKID HIT ROCK HIDDEN BY TALL GRASS.
```

## Aircraft

- Registration: [N7939S](https://openairdocs.org/deregistered/N7939S-2013-05-09), registration cancelled 2013-05-09, S/N 7557 (OpenAirDocs)
- Reported make and model: BELL 47G-4A
- Registry model: [Bell 47G-4A](https://openairdocs.org/model/bell-47g-4a) (registry code 1181031) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Burnt Granite Fs

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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