# NTSB OAK79FVD11: Hiller UH-12B, N94731, Brentwood, CA, February 25, 1979

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: February 25, 1979
- Place: Brentwood, CA · BRENTWOOD, CA
- Location: 37.9356° N, 121.7190° W: Placed by OpenAirDocs: center of Brentwood, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.9356&lon=-121.7190&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report March 22, 1979
- Report: Brief approved by the director
- NTSB case key (mKey): 137872
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK79FVD11
- Page: https://openairdocs.org/ntsb/OAK79FVD11

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0285  79/2/25  NR.BRENTWOOD,CA       HILLER UH-12B       CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 27, 1305
        TIME - 1230                    N94731              PX-  0  0  0  AERIAL APPLICATION        TOTAL HOURS, 1101 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         BRENTWOOD,CA                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: PROCEDURE TURNAROUND
           COLLIDED WITH: WIRES/POLES                               LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - IGNITION SYSTEM: SPARK PLUG
           MISCELLANEOUS ACTS,CONDITIONS - CARBON DEPOSITS
        FACTOR(S)
           TERRAIN - HIGH OBSTRUCTIONS
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         SPECIAL DATA
          TOTAL HOURS IN CROP CONTROL - 1000                       KIND OF OPERATION - SPRAYING CROPS
          KIND OF CROP - OTHER                                     TYPE OF CHEMICAL USED - LIQUID CHEMICAL-TOXIC
          PILOT' S SEAT BELT -FASTENED-PROPERLY                    GLOVES - NOT USED
          GOGGLES - NOT USED                                       CRASH HELMET - AVAILABLE USED
          COCKPIT CRASHPAD - NOT INSTALLED                         CRASH BAR - NOT INSTALLED
          TANK/HOPPER-LOCATION - SIDES                             TERRAIN-TYPE -LEVEL,FLAT
          ELEVATION-AREA BEING TREATED-FEET -  120                 SWATH RUN-HOW FLOWN - WIND CALM
          PROCEDURE TURNAROUND - SECOND 1/3 TURN
```

## Aircraft

- Registration: [N94731](https://openairdocs.org/deregistered/N94731-2007-07-17), registration cancelled 2007-07-17, S/N 387, built 1952 (OpenAirDocs)
- Reported make and model: HILLER UH-12B
- Registry model: [Hiller UH-12B](https://openairdocs.org/model/hiller-uh-12b) (registry code 4360110) (OpenAirDocs)
- Registry engine: [Franklin 6VS-335 series](https://openairdocs.org/engine/franklin-6vs-335-series) (registry code 27040, reciprocating) (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 19790225003659A](https://openairdocs.org/incident/19790225003659A), Feb 25, 1979: Hiller UH12C, Brentwood, CA, Substantial damage. Forced ldg due to engine failure. Inspection revealed heavy lead deposits on spak plugs.

## Other investigations on N94731 (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 LAX81FUG06](https://openairdocs.org/ntsb/LAX81FUG06), Dec 25, 1980: Hiller Acft UH-12B (N94731), Rialto, 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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