# NTSB CHI70FDW10: Bell 47G, N1575, Port Huron, MI, March 27, 1970

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: March 27, 1970
- Place: Port Huron, MI · PORT HURON, MI
- Location: 42.9938° N, 82.4337° W: Placed by OpenAirDocs: center of Port Huron, MI, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.9938&lon=-82.4337&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious
- Status: Completed, report December 8, 1970
- Report: Brief approved by the director
- NTSB case key (mKey): 134408
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI70FDW10
- Page: https://openairdocs.org/ntsb/CHI70FDW10

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1433  70/3/27    PORT HURON,MICH     BELL 47G            CR-  0  2  0  COMMERCIAL                COMMERCIAL, FL.INSTR.,
        TIME - 1435                    N1575               PX-  0  0  0  POWER/PIPELINE            AGE 35, 823 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            575 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          BAD AXE,MICH                MARYSVILLE,MICH
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLIDED WITH: WIRES/POLES                               IN FLIGHT: POWER-ON DESCENT
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OBJECTS OR OBSTRUCTIONS
           TERRAIN - HIGH OBSTRUCTIONS
```

## Aircraft

- Registration: [N1575](https://openairdocs.org/deregistered/N1575-2018-02-08), registration cancelled 2018-02-08, S/N 57 (OpenAirDocs)
- Reported make and model: BELL 47G
- Registry model: [Bell 47B3](https://openairdocs.org/model/bell-47b3) (registry code 1180606) (OpenAirDocs)
- Registry engine: [Lycoming TVO-435-GIA](https://openairdocs.org/engine/lycoming-tvo-435-gia) (registry code 41526, turbo-prop) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N1575 (4)

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 DFW06CA055](https://openairdocs.org/ntsb/DFW06CA055), Jan 13, 2006: Bell 47-B3 (N1575), Dennison, TX, substantial damage. Probable cause: The in-flight separation of the stabilizer bar tube.
- [NTSB FTW01LA087](https://openairdocs.org/ntsb/FTW01LA087), Mar 22, 2001: Bell 47G2 (N1575), Ardmore, OK, substantial damage. Probable cause: the loss of tail rotor control during maneuvering resultant from the failure of the tail rotor drive shaft coupling due to a stripped thread which allowed the grease lubricating the shaft to leak…
- [NTSB FTW98LA400](https://openairdocs.org/ntsb/FTW98LA400), Sep 17, 1998: Bell 47-G-2 (N1575), Ardmore, OK, substantial damage. Probable cause: The pilots failure to maintain clearance with terrain and the ensuing loss of control.
- [NTSB CHI77FEC47](https://openairdocs.org/ntsb/CHI77FEC47), Sep 18, 1977: Bell 47B3 (N1575), Lake Orion, MI, 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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