# NTSB FTW66A0087: Bell 47G-2, N939B, Billings, OK, April 4, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: April 4, 1966
- Place: Billings, OK · BILLINGS, OK
- Location: 36.5376° N, 97.4417° W: Placed by OpenAirDocs: center of Billings, OK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.5376&lon=-97.4417&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 June 2, 1966
- Report: Brief approved by the director
- NTSB case key (mKey): 172930
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW66A0087
- Page: https://openairdocs.org/ntsb/FTW66A0087

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0057   66/4/4    BILLINGS OKLA       BELL 47G-2          CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 31, 2600
        TIME - 1845                    N939B               PX-  0  0  0  ASSOC CROP CTL ACTIVITY   TOTAL HOURS, 400 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - CARTER AIRSTRIP
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            TAKEOFF: INITIAL CLIMB
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF POWERPLANT & POWERPLANT CONTROLS
        FACTOR(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: CLUTCH ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL -   20                       KIND OF OPERATION - SPRAYING CROPS
          KIND OF CROP - GRAIN FIELDS                              TYPE OF CHEMICAL USED - LIQUID CHEMICAL-TOXIC
          PILOT' S SEAT BELT -FASTENED-PROPERLY                    GLOVES - NOT USED
          GOGGLES - NOT USED                                       CRASH HELMET - AVAILABLE USED
          COCKPIT CRASHPAD - NOT INSTALLED                         CRASH BAR - NOT INSTALLED
          TANK/HOPPER-LOCATION - SIDES                             TERRAIN-TYPE -LEVEL,FLAT
        REMARKS- CENTRIFUGAL CLUTCH SLIPPAGE
```

## Aircraft

- Registration: [N939B](https://openairdocs.org/deregistered/N939B-1988-09-28), registration cancelled 1988-09-28, S/N 670 (OpenAirDocs)
- Reported make and model: BELL 47G-2
- Registry model: [Bell 47G](https://openairdocs.org/model/bell-47g) (registry code 1181002) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Carter Airstrip

## Other investigations on N939B (3)

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 MKC78FA065](https://openairdocs.org/ntsb/MKC78FA065), Aug 18, 1978: Bell 47-G2 (N939B), Branson, MO, destroyed, 3 fatal
- [NTSB MKC74FCG06](https://openairdocs.org/ntsb/MKC74FCG06), Aug 12, 1973: Bell 47G-2 (N939B), Branson, MO, substantial damage
- [NTSB MKC72FTK19](https://openairdocs.org/ntsb/MKC72FTK19), Jan 16, 1972: Bell 47G-2 (N939B), Rapid City, SD, destroyed

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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