# NTSB DEN68A0020: Bell 47G-3B, N1397X, Silverthorne, CO, October 12, 1967

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: October 12, 1967
- Place: Silverthorne, CO · SILVERTHORNE, CO
- Location: 39.6648° N, 106.0935° W: Placed by OpenAirDocs: center of Silverthorne, CO, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.6648&lon=-106.0935&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 3 minor
- Status: Completed, report November 24, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 113467
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN68A0020
- Page: https://openairdocs.org/ntsb/DEN68A0020

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0676  67/10/12 NR.SILVERTHORNE,COLO  BELL 47G-3B         CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 46, 554
        TIME - 0745                    N1397X              PX-  0  0  2  BUSINESS                  TOTAL HOURS, 160 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           HARD LANDING                                             LANDING: POWER-ON LANDING
           ROLL OVER                                                LANDING: POWER-ON LANDING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
           PILOT IN COMMAND - IMPROPER COMPENSATION FOR WIND CONDITIONS
        FACTOR(S)
           WEATHER - UNFAVORABLE WIND CONDITIONS
        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                                                      50
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          120                                                       45
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
```

## Aircraft

- Registration: [N1397X](https://openairdocs.org/aircraft/N1397X), registered now, S/N 6585, built 1966 (OpenAirDocs)
- Reported make and model: BELL 47G-3B
- Registry model: [Bell 47G-3B-1](https://openairdocs.org/model/bell-47g-3b-1) (registry code 1181028) (OpenAirDocs)
- Registry engine: [Lycoming TVO-435-GIA](https://openairdocs.org/engine/lycoming-tvo-435-gia) (registry code 41526, turbo-prop) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N1397X (4)

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 MIA96LA235](https://openairdocs.org/ntsb/MIA96LA235), Sep 29, 1996: Bell 47G-3B-1 (N1397X), Borinquen, PR, substantial damage. Probable cause: the pilot failed to maintain control of the aircraft while hover taxing. Factors in this accident were wind gusts and a tailwind.
- [NTSB MIA91LA217](https://openairdocs.org/ntsb/MIA91LA217), Sep 15, 1991: Bell 47G-3B-1 (N1397X), Penuelas, PR, substantial damage. Probable cause: INADVERTENT CONTROL INTERFERENCE BY A PASSENGER SHORTLY AFTER TAKEOFF RESULTING IN THE LOSS OF CONTROL AND ROLL OVER AFTER TOUCHDOWN.
- [NTSB LAX83LA184](https://openairdocs.org/ntsb/LAX83LA184), Apr 8, 1983: Bell 47G-3B-1 (N1397X), Delano, CA, substantial damage
- [NTSB DEN73AD015](https://openairdocs.org/ntsb/DEN73AD015), Oct 3, 1972: Bell 47G3B1 (N1397X), Hayden, CO, 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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