# NTSB OAK73FVM40: Hiller Acft UH-12C, N9734C, Salinas, CA, June 28, 1973

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: June 28, 1973
- Place: Salinas, CA · SALINAS, CA
- Location: 36.6902° N, 121.6338° W: Placed by OpenAirDocs: center of Salinas, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.6902&lon=-121.6338&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report September 13, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 190005
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK73FVM40
- Page: https://openairdocs.org/ntsb/OAK73FVM40

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2233  73/6/28    SALINAS,CALIF       HILLER ACFT UH-12C  CR-  0  0  1  COMMERCIAL                COMMERCIAL, FL.INSTR.,
        TIME - 0720                    N9734C              PX-  0  0  0  AERIAL APPLICATION        AGE 54, 11949 TOTAL
                                       DAMAGE-DESTROYED    OT-  0  0  0                            HOURS, 1540 IN TYPE,
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - SALINAS
        DEPARTURE POINT             INTENDED DESTINATION
          QUAIL CREEK,CALIF           LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: MAIN ROTOR                      IN FLIGHT: STARTING SWATH RUN
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           ROTORCRAFT - ROTOR ASSEMBLIES: MAIN ROTOR HEAD ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL - 9999                       KIND OF OPERATION - SPRAYING CROPS
          KIND OF CROP - LETTUCE                                   TYPE OF CHEMICAL USED - LIQUID CHEMICAL-TOXIC
          PILOT' S SEAT BELT -FASTENED-PROPERLY                    GLOVES - USED
          GOGGLES - NOT USED                                       CRASH HELMET - AVAILABLE USED
          COCKPIT CRASHPAD - NOT INSTALLED                         CRASH BAR - NOT INSTALLED
          TANK/HOPPER-LOCATION - BELLY                             TERRAIN-TYPE -LEVEL,FLAT
          ELEVATION-AREA BEING TREATED-FEET -  82                  SWATH RUN-HOW FLOWN - WIND CALM
          PROCEDURE TURNAROUND - THIRD 1/3 TURN
        REMARKS- MN ROTOR HUB ASSEMBLY,P/N 51437-7,FRACTURED THRU COUNTER BALANCE STUDS.
```

## Aircraft

- Registration: [N9734C](https://openairdocs.org/aircraft/N9734C), registered now, S/N 840, built 1956 (OpenAirDocs)
- Reported make and model: HILLER ACFT UH-12C
- Registry model: [Hiller UH-12C](https://openairdocs.org/model/hiller-uh-12c) (registry code 4360116) (OpenAirDocs)
- Registry engine: [Franklin 6V 350 series](https://openairdocs.org/engine/franklin-6v-350-series) (registry code 27043, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Destroyed
- Airport: Salinas

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19730628018469A](https://openairdocs.org/incident/19730628018469A), Jun 28, 1973: Hiller UH12C, Salinas, CA, Destroyed. MN rotor hub assembly,p/n 51437-7,fractured thru counter balance studs.

## Other investigations on N9734C (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 OAK73FVD14](https://openairdocs.org/ntsb/OAK73FVD14), Sep 12, 1972: Hiller Acft UH-12C (N9734C), Brentwood, CA, minor damage, 1 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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