# NTSB SEA68D0310: Bell 47G3B1, N7920S, Jackson, MT, May 11, 1968

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: May 11, 1968
- Place: Jackson, MT · JACKSON, MT
- Location: 45.3679° N, 113.4097° W: Placed by OpenAirDocs: center of Jackson, MT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=45.3679&lon=-113.4097&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report February 7, 1969
- Report: Brief approved by the director
- NTSB case key (mKey): 110599
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA68D0310
- Page: https://openairdocs.org/ntsb/SEA68D0310

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4281  68/5/11    JACKSON,MONT        BELL 47G3B1         CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, FL.INSTR.,
        TIME - 0730                    N7920S              PX-  0  0  1  AERIAL SURVEY             AGE 25, 5500 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            368 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: CLIMB TO CRUISE
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: MASTER AND CONNECTING RODS
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           TERRAIN - HIGH VEGETATION
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- CONNECTING ROD CAP BOLT FAILED IN NO 3 CYL.
```

## Aircraft

- Registration: [N7920S](https://openairdocs.org/aircraft/N7920S), registered now, S/N 6592 (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 0-435B](https://openairdocs.org/engine/lycoming-0-435b) (registry code 41519, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N7920S (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 SEA92LA067](https://openairdocs.org/ntsb/SEA92LA067), Apr 2, 1992: Bell 47G3B1 (N7920S), Miltonfreewater, OR, substantial damage. Probable cause: THE INADEQUATE PRELIGHT PREPARATION BY THE PILOT IN HIS FAILURE TO ENSURE THE FILLER HOSE WAS REMOVED BEFORE ATTEMPTING TO TAKEOFF.

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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