# NTSB OAK67A0022: Bell 47G3B1, N8528F, Bishop, CA, August 9, 1966

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: August 9, 1966
- Place: Bishop, CA · BISHOP, CA
- Location: 37.3672° N, 118.3989° W: Placed by OpenAirDocs: center of Bishop, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.3672&lon=-118.3989&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 3 serious
- Status: Completed, report April 11, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 122461
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK67A0022
- Page: https://openairdocs.org/ntsb/OAK67A0022

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0724   66/8/9  NR.BISHOP CALIF       BELL 47G3B1         CR-  0  1  0  MISCELLANEOUS             AIRLINE TRANSPORT, AGE
        TIME - 1735                    N8528F              PX-  0  2  0  OTHER PUBLIC              35, 5395 TOTAL HOURS,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            2400 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - BARCROFT LAB.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            TAKEOFF: INITIAL CLIMB
           COLLIDED WITH: OBJECT                                    LANDING: OTHER
        PROBABLE CAUSE(S)
           POWERPLANT - EXHAUST SYSTEM: EXTERNAL SUPERCHARGER
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPER CLEARANCE-TOLERANCE
          PWR PLT-TURBINE WHEEL RUBBED AGAINST CASE HOUSING.
        FACTOR(S)
           WEATHER - HIGH DENSITY ALTITUDE
           TERRAIN - ROUGH/UNEVEN
        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                                                      60
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          270                                                       8
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
         FIRE AFTER IMPACT
        REMARKS- STRUCK LARGE ROCK.
```

## Aircraft

- Registration: [N8528F](https://openairdocs.org/deregistered/N8528F-1974-10-01), registration cancelled 1974-10-01, S/N 3389, built 1965 (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)
- Category: Helicopter
- Engines: reciprocating
- Damage: Destroyed
- Airport: Barcroft Lab.

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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