# NTSB DEN80FTC05: Hiller Acft UH-12D, N31331, Mckennon, WY, February 8, 1980

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: February 8, 1980
- Place: Mckennon, WY · MCKENNON, WY
- Location: 41.0314° N, 109.9383° W: Placed by OpenAirDocs: center of McKinnon, WY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.0314&lon=-109.9383&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report July 11, 1980
- Report: Brief approved by the director
- NTSB case key (mKey): 131402
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN80FTC05
- Page: https://openairdocs.org/ntsb/DEN80FTC05

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0795   80/2/8  NR.MCKENNON,WY        HILLER ACFT UH-12D  CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 28, 430
        TIME - 1720                    N31331              PX-  0  0  1  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 30 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         MCKENNON,WY                  LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            LANDING: POWER-ON LANDING
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE CONTROLS: THROTTLE-POWER LEVER ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - FROZEN, MOISTURE
           MISCELLANEOUS ACTS,CONDITIONS - JAMMED
           PILOT IN COMMAND - MISJUDGED DISTANCE AND ALTITUDE
        REMARKS- PIC RPRTED THROTTLE LINKAGE FRZN AT HIGH PWR SETTING,SECURED ENG.
```

## Aircraft

- Registration: [N31331](https://openairdocs.org/deregistered/N31331-2014-11-17), registration cancelled 2014-11-17, S/N 1333, built 1961 (OpenAirDocs)
- Reported make and model: HILLER ACFT UH-12D
- Registry model: [Hiller UH-12D](https://openairdocs.org/model/hiller-uh-12d) (registry code 4360118) (OpenAirDocs)
- Registry engine: [Lycoming TVO-435-GIA](https://openairdocs.org/engine/lycoming-tvo-435-gia) (registry code 41526, turbo-prop) (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 19800208002479A](https://openairdocs.org/incident/19800208002479A), Feb 8, 1980: Hiller UH12D, Mckinnon, WY, Substantial damage. Pilot reported throttle froze wide open. Made hard landing. Helicopter had snow and ice on surface at departure.

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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