# NTSB DEN66A0089: Bell 47D1, N74121, Hyattville, WY, June 19, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 19, 1966
- Place: Hyattville, WY · HYATTVILLE, WY
- Location: 44.2498° N, 107.6150° W: Placed by OpenAirDocs: center of Hyattville, WY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.2498&lon=-107.6150&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report March 1, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 171109
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN66A0089
- Page: https://openairdocs.org/ntsb/DEN66A0089

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0579  66/6/19  NR.HYATTVILLE WYO     BELL 47D1           CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 41, 4500
        TIME - 1845                    N74121              PX-  0  0  0  ASSOC CROP CTL ACTIVITY   TOTAL HOURS, 3400 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            TAKEOFF: INITIAL CLIMB
           ROLL OVER                                                LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: OTHER
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL - 2000                       KIND OF OPERATION - DEFOLIATION (LIQUID)
          KIND OF CROP - OTHER                                     TYPE OF CHEMICAL USED - LIQUID CHEMICAL-NONTOXIC
          PILOT' S SEAT BELT -FASTENED-PROPERLY                    GLOVES - NOT USED
          GOGGLES - NOT USED                                       CRASH HELMET - NOT AVAILABLE
          COCKPIT CRASHPAD - NOT INSTALLED                         CRASH BAR - NOT INSTALLED
          TANK/HOPPER-LOCATION - SIDES                             TERRAIN-TYPE -MOUNTAINOUS
          ELEVATION-AREA BEING TREATED-FEET -  8100
        REMARKS- ACCESSORY CASE CRACKED,MAGNETO DRIVE GEARS BECAME DISENGAGED. SAGEBRUSH CONTROL.
```

## Aircraft

- Registration: [N74121](https://openairdocs.org/deregistered/N74121-2013-05-08), registration cancelled 2013-05-08, S/N WH-5006, built 1963 (OpenAirDocs)
- Reported make and model: BELL 47D1
- Registry model: [Bell 47D1](https://openairdocs.org/model/bell-47d1) (registry code 1180802) (OpenAirDocs)
- Registry engine: [Franklin 6V4 series](https://openairdocs.org/engine/franklin-6v4-series) (registry code 27033, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N74121 (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 CHI75DEV36](https://openairdocs.org/ntsb/CHI75DEV36), Jun 6, 1975: Bell 47D-1 (N74121), Carmi, IL, destroyed
- [NTSB FTW73FPD37](https://openairdocs.org/ntsb/FTW73FPD37), May 21, 1973: Bell 47D1 (N74121), Decatur, TX, substantial damage
- [NTSB FTW72DPD40](https://openairdocs.org/ntsb/FTW72DPD40), May 8, 1972: Bell 47D1 (N74121), Glen Rose, TX, substantial damage
- [NTSB FTW70FPA07](https://openairdocs.org/ntsb/FTW70FPA07), Mar 4, 1970: Bell 47D1 (N74121), Howe, TX, substantial damage
- [NTSB DEN66A0080](https://openairdocs.org/ntsb/DEN66A0080), May 6, 1966: Bell 47D1 (N74121), Albuquerque, NM, 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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