# NTSB SEA73FTI20: Bell 47G3B1, N73946, Dayton, MT, May 16, 1973

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: May 16, 1973
- Place: Dayton, MT · DAYTON, MT
- Location: 47.8649° N, 114.2768° W: Placed by OpenAirDocs: center of Dayton, MT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=47.8649&lon=-114.2768&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report June 27, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 190562
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA73FTI20
- Page: https://openairdocs.org/ntsb/SEA73FTI20

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1163  73/5/16    DAYTON,MONT         BELL 47G3B1         CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 40, 10000
        TIME - 0705                    N73946              PX-  0  0  0  AERIAL APPLICATION        TOTAL HOURS, 4500 IN
                                       DAMAGE-DESTROYED    OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          DAYTON,MONT                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           FIRE OR EXPLOSION: IN FLIGHT                             IN FLIGHT: SWATH RUN
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: SWATH RUN
        PROBABLE CAUSE(S)
           INSTRUMENTS/EQUIPMENT AND ACCESSORIES - MISCELLANEOUS EQUIPMENT: SPRAY,DUSTING EQUIPMENT
           MISCELLANEOUS ACTS,CONDITIONS - LEAK/LEAKAGE
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           MISCELLANEOUS ACTS,CONDITIONS - FIRE IN ENGINE
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL - 3500                       KIND OF OPERATION - OTHER
          KIND OF CROP - SAGE                                      TYPE OF CHEMICAL USED - LIQUID CHEMICAL-NONTOXIC
          PILOT' S SEAT BELT -FASTENED-PROPERLY                    GLOVES - NOT USED
          GOGGLES - NOT USED                                       CRASH HELMET - AVAILABLE-NOT USED
          COCKPIT CRASHPAD - NOT INSTALLED                         CRASH BAR - NOT INSTALLED
          TANK/HOPPER-LOCATION - SIDES                             TERRAIN-TYPE -ROLLING
          ELEVATION-AREA BEING TREATED-FEET -  4000                              MOUNTAINOUS
          SWATH RUN-HOW FLOWN - WIND CALM
        REMARKS- SEVERE LEAK IN SPRAY HOSE OR SYS ALLOWED INFLAMMABLE SPRAY TO CTC HOT ENG AREA.PLT AUTOROTATED OK.
```

## Aircraft

- Registration: [N73946](https://openairdocs.org/deregistered/N73946-1973-06-25), registration cancelled 1973-06-25, S/N 2819 (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: Destroyed

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19730516012049A](https://openairdocs.org/incident/19730516012049A), May 16, 1973: Bell 47G3B1, Dayton, MT, Destroyed. Severe leak in spray hose or sys allowed inflammable spray to ctc hot eng area. Plt autorotated ok.

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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