# NTSB OAK75FVM27: Hiller Acft UH-12E, N9770C, King City, CA, April 17, 1975

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: April 17, 1975
- Place: King City, CA · KING CITY, CA
- Location: 36.2163° N, 121.1320° W: Placed by OpenAirDocs: center of King City, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.2163&lon=-121.1320&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report June 17, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 148389
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK75FVM27
- Page: https://openairdocs.org/ntsb/OAK75FVM27

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1124  75/4/17  NR.KING CITY,CA       HILLER ACFT UH-12E  CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 30, 3000
        TIME - 0550                    N9770C              PX-  0  0  0  ASSOC CROP CTL ACTIVITY   TOTAL HOURS, 1000 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          QUAIL CREEK,CA             KING CITY,CA
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           ROTORCRAFT - MISCELLANEOUS UNITS AND ASSEMBLIES: TAIL BOOMS/PYLONS/CONES
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPER CLEARANCE-TOLERANCE
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY INSTALLED
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - VIBRATION,EXCESSIVE
         SPECIAL DATA
          KIND OF OPERATION - FERRY
        REMARKS- WOBBLE PLATE PYLON ASSEMBLY FAILED.
```

## Aircraft

- Registration: [N9770C](https://openairdocs.org/deregistered/N9770C-1993-07-29), registration cancelled 1993-07-29, S/N 2160 (OpenAirDocs)
- Reported make and model: HILLER ACFT UH-12E
- Registry model: [Hiller UH-12E](https://openairdocs.org/model/hiller-uh-12e) (registry code 4360122) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## 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 19750417008519A](https://openairdocs.org/incident/19750417008519A), Apr 17, 1975: Hiller UH12E, King City, CA, Substantial damage. Wobble plate pylon assembly failed.

## Other investigations on N9770C (6)

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 LAX83LA360](https://openairdocs.org/ntsb/LAX83LA360), Jul 27, 1983: Hiller 12E (N9770C), Los Banos, CA, destroyed
- [NTSB LAX80DVA22](https://openairdocs.org/ntsb/LAX80DVA22), Mar 8, 1980: Hiller UH-12E (N9770C), Merced, CA, substantial damage
- [NTSB OAK76FVM47](https://openairdocs.org/ntsb/OAK76FVM47), Sep 10, 1976: Hiller Acft UH-12E (N9770C), Salinas, CA, substantial damage
- [NTSB LAX74FUM12](https://openairdocs.org/ntsb/LAX74FUM12), Nov 19, 1973: Hiller Acft UH-12E (N9770C), Brawley, CA, substantial damage
- [NTSB ANC67A0065](https://openairdocs.org/ntsb/ANC67A0065), Jun 22, 1967: Hiller Acft UH12E4 (N9770C), Eagle, AK, substantial damage
- [NTSB ANC66A0048](https://openairdocs.org/ntsb/ANC66A0048), Jun 7, 1966: Hiller UH-12E (N9770C), Fairbanks, AK, 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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