# NTSB DEN67A0002: Hiller UH12E, N9754C, Greybull, WY, July 7, 1966

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: July 7, 1966
- Place: Greybull, WY · GREYBULL, WY
- Location: 44.4865° N, 108.0557° W: Placed by OpenAirDocs: center of Greybull, WY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.4865&lon=-108.0557&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 1 uninjured
- Status: Completed, report March 15, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 171116
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN67A0002
- Page: https://openairdocs.org/ntsb/DEN67A0002-171116

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0587   66/7/7  NR.GREYBULL WYO       HILLER UH12E        CR-  0  0  1  COMMERCIAL                COMMERCIAL, FL.INSTR.,
        TIME - 1800                    N9754C              PX-  0  0  1  CTR PASSG-D               AGE 27, 3060 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            1000 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           STALL                                                    TAKEOFF: INITIAL CLIMB
           COLLISION WITH GROUND/WATER: CONTROLLED                  IN FLIGHT: POWER-ON DESCENT
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO OBTAIN/MAINTAIN FLYING SPEED
           PILOT IN COMMAND - EXERCISED POOR JUDGMENT
           WEATHER - HIGH DENSITY ALTITUDE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - DOWNWIND
        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                                                      60
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
           90                                                       10
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
         FIRE AFTER IMPACT
        REMARKS- DENSITY ALTITUDE 14000 FT.DID NOT OBTAIN TRANSLATIONAL LIFT.WIND 10 KTS GUSTY.NO FIRE DAMAGE.
```

## Aircraft

- Registration: [N9754C](https://openairdocs.org/aircraft/N9754C), registered now, S/N 2149, built 1961 (OpenAirDocs)
- Reported make and model: HILLER UH12E
- Registry model: [Hiller UH-12E](https://openairdocs.org/model/hiller-uh-12e) (registry code 4360122) (OpenAirDocs)
- Registry engine: [Lycoming VO-540 series](https://openairdocs.org/engine/lycoming-vo-540-series) (registry code 41534, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N9754C (2)

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 CEN10CA362](https://openairdocs.org/ntsb/CEN10CA362), Jun 25, 2010: Hiller UH-12E (N9754C), Grand Junction, CO, substantial damage. Probable cause: The total loss of engine power for undetermined reasons.
- [NTSB DEN66A0084](https://openairdocs.org/ntsb/DEN66A0084), May 21, 1966: Hiller UH-12E (N9754C), Lonetree, WY, 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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.