# NTSB SEA66A0068: Bell 47G3B1, N8505F, Lincoln, MT, June 17, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 17, 1966
- Place: Lincoln, MT · LINCOLN, MT
- Location: 46.9534° N, 112.6715° W: Placed by OpenAirDocs: center of Lincoln, MT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=46.9534&lon=-112.6715&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report March 1, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 171106
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA66A0068
- Page: https://openairdocs.org/ntsb/SEA66A0068

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0577  66/6/17  NR.LINCOLN MONT       BELL 47G3B1         CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 35, 5250
        TIME - 1630                    N8505F              PX-  0  0  2  CTR PASSG-D               TOTAL HOURS, 850 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - MEADOW CREEK MINE
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            TAKEOFF: INITIAL CLIMB
           COLLIDED WITH: TREES                                     LANDING: POWER-ON LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - EXHAUST SYSTEM: CLAMPS
           POWERPLANT - EXHAUST SYSTEM: EXTERNAL SUPERCHARGER
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
        FACTOR(S)
           WEATHER - HIGH DENSITY ALTITUDE
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          NONE                                                      70
        WIND VELOCITY-KNOTS                                      TYPE OF WEATHER CONDITIONS
          CALM                                                     VFR
        TYPE OF FLIGHT PLAN
          NONE
        REMARKS- DENSITY ALTITUDE-8586 FT. EXCESSIVE LEAKING OF EXHAUST GASES REDUCED TURBOCHARGER EFFICIENCY.
```

## Aircraft

- Registration: N8505F (not matched to a registry record)
- Reported make and model: BELL 47G3B1
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Meadow Creek Mine

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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