# NTSB FTW73DPJ20: Hiller UH-12B, N6744C, Guymon, OK, May 28, 1973

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: May 28, 1973
- Place: Guymon, OK · GUYMON, OK
- Location: 36.6901° N, 101.4770° W: Placed by OpenAirDocs: center of Guymon, OK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.6901&lon=-101.4770&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report June 22, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 190422
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW73DPJ20
- Page: https://openairdocs.org/ntsb/FTW73DPJ20

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1372  73/5/28    GUYMON,OKLA         HILLER UH-12B       CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, FL.INSTR.,
        TIME - 1820                    N6744C              PX-  0  0  2  PLEASURE/PERSONAL TRANSP  AGE 50, 12000 TOTAL
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            HOURS, 310 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - GUYMON AIRPARK
        DEPARTURE POINT             INTENDED DESTINATION
          GUYMON,OKLA                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            TAKEOFF: VERTICAL
           ROLL OVER                                                LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
           POWERPLANT - EXHAUST SYSTEM: EXTERNAL SUPERCHARGER
           POWERPLANT - ENGINE CONTROLS: THROTTLE-POWER LEVER ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - JAMMED
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING ON AIRPORT/SEAPLANE BASE/HELIPT.
        REMARKS- AFTR T/O TO HOVER THEN TRANS LIFT ENG PWR LEVR STUCK.ENG OVERBOOST,PLT CUT IGN.LINKAGE OUT OF RIG.
```

## Aircraft

- Registration: [N6744C](https://openairdocs.org/aircraft/N6744C), registered now, S/N 556 (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
- Airport: Guymon Airpark

## 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 19730528012929A](https://openairdocs.org/incident/19730528012929A), May 28, 1973: Hiller UH12B, Guymon, OK, Substantial damage. Aftr t/o to hover then trans lift eng pwr levr stuck. Eng overboost,plt cut ign. Linkage out of rig.

## Other investigations on N6744C (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 CHI74AC096](https://openairdocs.org/ntsb/CHI74AC096), Jun 2, 1974: Hiller Acft UH-12B (N6744C), Custar, OH, destroyed, 1 fatal

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.