# NTSB SEA77FTI11: Bell 47G3B1, N12437, Polson, MT, April 17, 1977

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: April 17, 1977
- Place: Polson, MT · POLSON, MT
- Location: 47.6885° N, 114.1407° W: Placed by OpenAirDocs: center of Polson, MT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=47.6885&lon=-114.1407&mi=10
- Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious
- Status: Completed, report May 19, 1977
- Report: Brief approved by the director
- NTSB case key (mKey): 158054
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA77FTI11
- Page: https://openairdocs.org/ntsb/SEA77FTI11

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0956  77/4/17  NR.POLSON,MT          BELL 47G3B1         CR-  0  2  0  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1700                    N12437              PX-  0  0  0  DUAL                      AGE 63, 17095 TOTAL
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            HOURS, 607 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          BIG ARM,MT                  LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLIDED WITH: WIRES/POLES                               TAXI: AERIAL TAXI, OTHER
        PROBABLE CAUSE(S)
           DUAL STUDENT - FAILED TO SEE AND AVOID OBJECTS OR OBSTRUCTIONS
           PILOT IN COMMAND - INADEQUATE SUPERVISION OF FLIGHT
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - AIRCRAFT CAME TO REST IN WATER
        REMARKS- UNMARKED WIRES.
```

## Aircraft

- Registration: [N12437](https://openairdocs.org/deregistered/N12437-2015-05-08), registration cancelled 2015-05-08, S/N 6509, built 1966 (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)
- 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

## 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 19770417008039A](https://openairdocs.org/incident/19770417008039A), Apr 17, 1977: Bell 47G3B1, Polson, MT, Substantial damage. Unmarked wires.

## Other investigations on N12437 (1)

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 ATL82DA179](https://openairdocs.org/ntsb/ATL82DA179), Jun 28, 1982: Bell 47G-3B-1 (N12437), Headland, AL, 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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