# NTSB FTW79FPJ26: Hiller UH12L4, N90453, Elk City, OK, June 22, 1979

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: June 22, 1979
- Place: Elk City, OK · ELK CITY, OK
- Location: 35.3896° N, 99.4287° W: Placed by OpenAirDocs: center of Elk City, OK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=35.3896&lon=-99.4287&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor, 1 uninjured
- Status: Completed, report August 31, 1979
- Report: Brief approved by the director
- NTSB case key (mKey): 135794
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW79FPJ26
- Page: https://openairdocs.org/ntsb/FTW79FPJ26

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1579  79/6/22    ELK CITY,OK         HILLER UH12L4       CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, FL.INSTR.,
        TIME - 0900                    N90453              PX-  0  0  2  PLEASURE/PERSONAL TRANSP  AGE 37, 3290 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            25 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          ELK CITY,OK                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           HARD LANDING                                             LANDING: ROLL-ON/RUN-ON
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: CLUTCH ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPER ALIGNMENT/ADJUSTMENT
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- PLT STATED MAIN ROTOR CLUTCH SLIPPED.
```

## Aircraft

- Registration: [N90453](https://openairdocs.org/deregistered/N90453-2013-04-12), registration cancelled 2013-04-12, S/N 2503, built 1965 (OpenAirDocs)
- Reported make and model: HILLER UH12L4
- Registry model: [Hiller UH-12L4](https://openairdocs.org/model/hiller-uh-12l4) (registry code 4360128) (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

## 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 19790622018439A](https://openairdocs.org/incident/19790622018439A), Jun 22, 1979: Hiller UH12L4, Elk City, OK, Substantial damage. Helicopter RPM began to decay, developed high sink rate. Made hard landing. Found clutch slipping..

## Other investigations on N90453 (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 FTW94LA210](https://openairdocs.org/ntsb/FTW94LA210), Jun 22, 1994: Hiller UH-12L4 (N90453), West Helena, AR, destroyed. Probable cause: A TOTAL LOSS OF POWER DUE TO A LEAK IN THE MAIN FUEL LINE WHICH OCCURRED AS A RESULT OF AN ELECTRICAL SHORT WHICH BURNED A HOLE IN THE FUEL LINE. FACTORS WERE A FAILURE BY THE PILOT TO PERFORM…

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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