# NTSB OAK69F0318: Bell 47G3B1, N1335X, Las Vegas, NV, May 11, 1969

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: May 11, 1969
- Place: Las Vegas, NV · LAS VEGAS, NV
- Location: 36.1750° N, 115.1372° W: Placed by OpenAirDocs: center of Las Vegas, NV, within about 7 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.1750&lon=-115.1372&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report August 7, 1969
- Report: Brief approved by the director
- NTSB case key (mKey): 174485
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK69F0318
- Page: https://openairdocs.org/ntsb/OAK69F0318

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1751  69/5/11    LAS VEGAS,NEV       BELL 47G3B1         CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 26, 2763
        TIME - 0800                    N1335X              PX-  0  0  0  CONSTRUCTION              TOTAL HOURS, 25 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: HOVERING
           COLLIDED WITH: TREES                                     LANDING: FINAL APPROACH
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: OTHER
           MISCELLANEOUS ACTS,CONDITIONS - WARPED
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPER ALIGNMENT/ADJUSTMENT
           TERRAIN - HIGH OBSTRUCTIONS
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- IMPROPERLY ADJUSTED DENSITY CONTROLLER CAUSED WASTE GATE TO WARP AND TURBO CHARGER INEFFECTIVE.
```

## Aircraft

- Registration: [N1335X](https://openairdocs.org/aircraft/N1335X), registered now, S/N 6556, 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

## Other investigations on N1335X (4)

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 LAX97TA213](https://openairdocs.org/ntsb/LAX97TA213), Jun 16, 1997: Bell 47G-3B-1 (N1335X), Fallon, NV, substantial damage. Probable cause: exhaustion of the aircraft's fuel supply, due to improper planning and/or decision. A factor related to the accident was the high density altitude which made a successful autorotative landing…
- [NTSB FTW96TA383](https://openairdocs.org/ntsb/FTW96TA383), Sep 10, 1996: Bell 47G-3B-1 (N1335X), Rangely, CO, substantial damage. Probable cause: the pilot's excessive cyclic control input during a low altitude operation, and his failure to maintain altitude/clearance from high vegetation (sage brush). The proximity of high vegetation was a…
- [NTSB LAX79DX030](https://openairdocs.org/ntsb/LAX79DX030), Jul 14, 1979: Bell 47G3B1 (N1335X), Montello, NV, substantial damage
- [NTSB CAN70A4457](https://openairdocs.org/ntsb/CAN70A4457), Jul 26, 1969: Bell 47G3B1 (N1335X), Hope, Canada, destroyed, 3 fatal

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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