# NTSB OAK74DVG47: Grumman G-164, N73646, Grimes, CA, April 18, 1974

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: April 18, 1974
- Place: Grimes, CA · GRIMES, CA
- Location: 39.0742° N, 121.8988° W: Placed by OpenAirDocs: center of Grimes, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.0742&lon=-121.8988&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report June 7, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 124412
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK74DVG47
- Page: https://openairdocs.org/ntsb/OAK74DVG47

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1094  74/4/18    GRIMES,CALIF        GRUMMAN G-164       CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 47, 12000
        TIME - 0630                    N73646              PX-  0  0  0  ASSOC CROP CTL ACTIVITY   TOTAL HOURS, 1000 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - THAYER BROS.
        DEPARTURE POINT             INTENDED DESTINATION
          GRIMES,CALIF                LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            TAKEOFF: INITIAL CLIMB
           NOSE OVER/DOWN                                           LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPER MAINTENANCE (OWNER PERSONNEL)
           POWERPLANT - ENGINE STRUCTURE: BLOWER,IMPELLER ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - LACK OF LUBRICATION-SPECIFIC PART,NOT SYSTEM
           MISCELLANEOUS ACTS,CONDITIONS - OVERHEATED
           TERRAIN - HIGH VEGETATION
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 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                                      TYPE OF CHEMICAL USED - DRY CHEMICAL-NONTOXIC
          PILOT' S SEAT BELT -FASTENED-PROPERLY                    GLOVES - USED
          GOGGLES - USED                                           CRASH HELMET - AVAILABLE USED
          COCKPIT CRASHPAD - NOT INSTALLED                         CRASH BAR - INSTALLED
          TANK/HOPPER-LOCATION - FORWARD OF PILOT                  TERRAIN-TYPE -LEVEL,FLAT
          ELEVATION-AREA BEING TREATED-FEET -  46
        REMARKS- ACFT LND IN FIELD OF TALL WHEAT.FAILURE TO PRE-LUBE BLOWER SECTION CAUSED IMPELLER SECTION TO FAIL
```

## Aircraft

- Registration: [N73646](https://openairdocs.org/deregistered/N73646-1998-09-12), registration cancelled 1998-09-12, S/N 100 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164
- Registry model: [Grumman G-164](https://openairdocs.org/model/grumman-g-164) (registry code 3952702) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Thayer Bros.

## Other investigations on N73646 (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 LAX85LA284](https://openairdocs.org/ntsb/LAX85LA284), Jun 19, 1985: Grumman G-164 (N73646), Glenn, 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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