# NTSB DEN80DTM36: Hiller Acft UH-12D, N31332, Coalville, UT, August 8, 1980

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: August 8, 1980
- Place: Coalville, UT · COALVILLE, UT
- Location: 40.9074° N, 111.4212° W: Placed by OpenAirDocs: center of Coalville, UT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=40.9074&lon=-111.4212&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 2 uninjured
- Status: Completed, report October 28, 1980
- Report: Brief approved by the director
- NTSB case key (mKey): 129174
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN80DTM36
- Page: https://openairdocs.org/ntsb/DEN80DTM36

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2553   80/8/8  NR.COALVILLE,UT       HILLER ACFT UH-12D  CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, AGE 27, 1375
        TIME - 1300                    N31332              PX-  0  1  1  AERIAL SURVEY             TOTAL HOURS, 1115 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         COALVILLE,UT                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLIDED WITH: TREES                                     TAKEOFF: VERTICAL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - INADEQUATE PREFLIGHT PREPARATION AND/OR PLANNING
        FACTOR(S)
           WEATHER - UNFAVORABLE WIND CONDITIONS
           WEATHER - HIGH DENSITY ALTITUDE
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        WEATHER FORECAST - UNKNOWN/NOT REPORTED
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          NONE                                                      88
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          315                                                       12
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
        REMARKS- UN TO GET TRANSLATIONAL LIFT DRG TKOF ON DWNWND SIDE OF HILL.APRX 8700FT MSL.WIND GUSTING 18K.
```

## Aircraft

- Registration: [N31332](https://openairdocs.org/deregistered/N31332-2013-08-08), registration cancelled 2013-08-08, S/N 1334, 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 19800808034539A](https://openairdocs.org/incident/19800808034539A), Aug 8, 1980: Hiller UH12D, Coalville, UT, Substantial damage, 1 fatal. Tried to take off near gross in high density altitude & gusty wind. Could not get translational lift. Struck trees.

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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