# NTSB OAK66F0274: Grumman G-164, N729Y, Butte City, CA, April 20, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: April 20, 1966
- Place: Butte City, CA · BUTTE CITY, CA
- Location: 39.4646° N, 121.9900° W: Placed by OpenAirDocs: center of Butte City, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.4646&lon=-121.9900&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report June 10, 1966
- Report: Brief approved by the director
- NTSB case key (mKey): 172044
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK66F0274
- Page: https://openairdocs.org/ntsb/OAK66F0274

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0860  66/4/20    BUTTE CITY CALIF    GRUMMAN G-164       CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 45, 12000
        TIME - 1945                    N729Y               PX-  0  0  0  AERIAL APPLICATION        TOTAL HOURS, 120 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: SWATH RUN
           COLLIDED WITH: DIRT BANK                                 LANDING: ROLL
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: MASTER AND CONNECTING RODS
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL - 9999                       KIND OF OPERATION - SEEDING CROPS
          KIND OF CROP - RICE                                      PILOT' S SEAT BELT -FASTENED-PROPERLY
          GLOVES - USED                                            GOGGLES - USED
          CRASH HELMET - AVAILABLE USED                            COCKPIT CRASHPAD - INSTALLED
          CRASH BAR - INSTALLED                                    TANK/HOPPER-LOCATION - FORWARD OF PILOT
          TERRAIN-TYPE -LEVEL,FLAT                                 ELEVATION-AREA BEING TREATED-FEET -  100
          SWATH RUN-HOW FLOWN - CROSSWIND
        REMARKS- WRIST PIN AND LINK ROD NO. 1 CYLINDER FAILED.
```

## Aircraft

- Registration: [N729Y](https://openairdocs.org/deregistered/N729Y-2013-04-22), registration cancelled 2013-04-22, S/N 290, built 1964 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164
- Registry model: [Grumman G-164](https://openairdocs.org/model/grumman-g-164) (registry code 3952702) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N729Y (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 OAK76FVG83](https://openairdocs.org/ntsb/OAK76FVG83), Jun 10, 1976: Grumman G-164A (N729Y), Princeton, CA, 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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