# NTSB OAK66A0058: Bell 47G3B1, N73987, Lone Pine, CA, June 20, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 20, 1966
- Place: Lone Pine, CA · LONE PINE, CA
- Location: 36.5744° N, 118.0806° W: Placed by OpenAirDocs: center of Lone Pine, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.5744&lon=-118.0806&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): 171110
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK66A0058
- Page: https://openairdocs.org/ntsb/OAK66A0058

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0580  66/6/20  NR.LONE PINE CALIF    BELL 47G3B1         CR-  0  0  1  COMMERCIAL                COMMERCIAL, FL.INSTR.,
        TIME - 0925                    N73987              PX-  0  0  2  CTR PASSG-D               AGE 40, 7327 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            1400 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            TAKEOFF: INITIAL CLIMB
           COLLIDED WITH: TREES                                     LANDING: POWER-ON LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: BLOWER,IMPELLER ASSEMBLY
           PILOT IN COMMAND - MISJUDGED DISTANCE
        FACTOR(S)
           WEATHER - HIGH DENSITY ALTITUDE
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     *ERROR-INVALID CODE*
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          NONE                                                      50
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
        REMARKS- TURBOCHARGER MALFUNCTION.UNABLE CLIMB OUT OF CLEARING.STRUCK TREE WHILE LANDING AT TAKEOFF POINT.
```

## Aircraft

- Registration: N73987 (not matched to a registry record)
- Reported make and model: BELL 47G3B1
- Category: Helicopter
- Engines: reciprocating
- Damage: 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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