# NTSB CHI72AC013: Bell 47G2A1, N73989, Bellwood, IL, August 10, 1971

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: August 10, 1971
- Place: Bellwood, IL · BELLWOOD, IL
- Location: 41.8829° N, 87.8762° W: Placed by OpenAirDocs: center of Bellwood, IL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.8829&lon=-87.8762&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed, report July 5, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 163043
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI72AC013
- Page: https://openairdocs.org/ntsb/CHI72AC013

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4198  71/8/10    BELLWOOD,ILL        BELL 47G2A1         CR-  1  0  0  MISCELLANEOUS             COMMERCIAL, AGE 29, 1898
        TIME - 1628                    N73989              PX-  1  0  0  POLICE PATROL             TOTAL HOURS, 257 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          CHICAGO,ILL                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: OTHER
           COLLIDED WITH: WIRES/POLES                               IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           ROTORCRAFT - MISCELLANEOUS UNITS AND ASSEMBLIES: TAIL BOOMS/PYLONS/CONES
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
        FACTOR(S)
           TERRAIN - HIGH OBSTRUCTIONS
         FIRE AFTER IMPACT
        REMARKS- T/R DRIVE SHAFT YOKE FAILED,PLT UN CTL HELICOPTER,HIT POLE.
```

## Aircraft

- Registration: [N73989](https://openairdocs.org/deregistered/N73989-1971-11-22), registration cancelled 1971-11-22, S/N 2879 (OpenAirDocs)
- Reported make and model: BELL 47G2A1
- Registry model: [Bell 47G-2A-1](https://openairdocs.org/model/bell-47g-2a-1) (registry code 1181014) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: 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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