# NTSB DEN69D0071: Bell 47G3B1, N8471E, Dubois, WY, August 4, 1968

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 4, 1968
- Place: Dubois, WY · DUBOIS, WY
- Location: 43.5461° N, 109.6480° W: Placed by OpenAirDocs: center of Dubois, WY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.5461&lon=-109.6480&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report October 15, 1968
- Report: Brief approved by the director
- NTSB case key (mKey): 108837
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN69D0071
- Page: https://openairdocs.org/ntsb/DEN69D0071

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2730   68/8/4    DUBOIS,WYO          BELL 47G3B1         CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 23, 2250
        TIME - 0830                    N8471E              PX-  0  0  1  CTR PASSG-D               TOTAL HOURS, 150 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLIDED WITH: OBJECT                                    LANDING: FINAL APPROACH
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - EXERCISED POOR JUDGMENT
           WEATHER - DOWNDRAFT,UPDRAFTS
           WEATHER - UNFAVORABLE WIND CONDITIONS
        FACTOR(S)
           WEATHER - HIGH DENSITY ALTITUDE
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        WEATHER FORECAST - UNKNOWN/NOT REPORTED
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          NONE                                                      75
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          315                                                       30
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
        REMARKS- ATTEMPTED LDG ON TOP OF MT.SETTLED,T/R STRUCK ROCK.WIND 30K,GUSTING.DENSITY ALT 14500 FT.
```

## Aircraft

- Registration: [N8471E](https://openairdocs.org/deregistered/N8471E-1997-12-24), registration cancelled 1997-12-24, S/N 2654 (OpenAirDocs)
- Reported make and model: BELL 47G3B1
- Registry model: [Bell 47G-3B](https://openairdocs.org/model/bell-47g-3b) (registry code 1181026) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N8471E (5)

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 MKC89LA181](https://openairdocs.org/ntsb/MKC89LA181), Aug 15, 1989: Bell 47G-B3 (N8471E), Waseca, MN, substantial damage. Probable cause: INADEQUATE PREFLIGHT BY THE PILOT WHICH RESULTED IN FUEL EXHAUSTION DUE TO AN INADEQUATE SUPPLY OF FUEL. THE TAILWIND, HIGH OBSTRUCTION (POWER LINE), AND CROP (BEANS) WERE CONTRIBUTING FACTORS.
- [NTSB CHI83LA264](https://openairdocs.org/ntsb/CHI83LA264), Jun 17, 1983: Bell 47-G3B (N8471E), Litchfield, MN, substantial damage
- [NTSB MKC79FCD41](https://openairdocs.org/ntsb/MKC79FCD41), Sep 25, 1979: Bell 47G-3B (N8471E), Pierson, IA, substantial damage
- [NTSB DEN68A0008](https://openairdocs.org/ntsb/DEN68A0008), Jul 27, 1967: Bell 47G3B1 (N8471E), Bondurant, WY, destroyed, 2 fatal
- [NTSB SEA67A0005](https://openairdocs.org/ntsb/SEA67A0005), Jul 19, 1966: Bell 47G-3B (N8471E), Lakeview, OR, 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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.