# NTSB DEN73FTC05: Alouette III, N6874, Greybull, WY, August 8, 1972

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: August 8, 1972
- Place: Greybull, WY · GREYBULL, WY
- Location: 44.4865° N, 108.0557° W: Placed by OpenAirDocs: center of Greybull, WY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.4865&lon=-108.0557&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed, report January 23, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 167633
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN73FTC05
- Page: https://openairdocs.org/ntsb/DEN73FTC05

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1246   72/8/8    GREYBULL,WYO        ALOUETTE III        CR-  0  1  0  MISCELLANEOUS             COMMERCIAL, FL.INSTR.,
        TIME - 1130                    N6874               PX-  0  0  0  FERRY                     AGE 45, 9932 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            65 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          CODY,WYO                    GREYBULL,WYO
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           MISCELLANEOUS                                            IN FLIGHT: NORMAL CRUISE
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: ENGINE DRIVE SHAFT
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: SUBSTANDARD QUALITY CONTROL
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
                                  SUSPECTED MECHANICAL DISCREPANCY
                                  PITCH CONTROL PROBLEM
        REMARKS- MAIN DRIVE SHAFT FAILED DUE TO FAULTY MACHINING.SHAFT SEPARATED,WENT THRU ROTOR HEAD ASSY.
```

## Aircraft

- Registration: [N6874](https://openairdocs.org/deregistered/N6874-1989-02-07), registration cancelled 1989-02-07, S/N 1702 (OpenAirDocs)
- Reported make and model: ALOUETTE III
- Registry model: [Aerospatiale SE3160 ALOUETTE III](https://openairdocs.org/model/aerospatiale-se3160-alouette-iii) (registry code 8680605) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- Damage: 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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