# NTSB LAX68A0080: Hiller UN-12L, N9780C, Windna, AZ, February 27, 1968

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: February 27, 1968
- Place: Windna, AZ · WINDNA, AZ
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor
- Status: Completed, report March 22, 1968
- Report: Brief approved by the director
- NTSB case key (mKey): 111736
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX68A0080
- Page: https://openairdocs.org/ntsb/LAX68A0080

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0265  68/2/27    WINDNA,ARIZ         HILLER UN-12L       CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 40, 6000
        TIME - 1400                    N9780C              PX-  0  0  1  CTR PASSG-D               TOTAL HOURS, 200 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: HOVERING
           COLLIDED WITH: TREES                                     IN FLIGHT: EMERGENCY DESCENT
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: VALVE ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
         FIRE AFTER IMPACT
        REMARKS- FAILURE OF NO 2 CYL EXHAUST VALVE.
```

## Aircraft

- Registration: [N9780C](https://openairdocs.org/deregistered/N9780C-2013-05-30), registration cancelled 2013-05-30, S/N 2500, built 1964 (OpenAirDocs)
- Reported make and model: HILLER UN-12L
- Registry model: [Hiller UH-12L](https://openairdocs.org/model/hiller-uh-12l) (registry code 4360126) (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 N9780C (3)

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 FTW67A0056](https://openairdocs.org/ntsb/FTW67A0056), Nov 19, 1966: Hiller UH-12L (N9780C), Woodville, TX, substantial damage
- [NTSB DEN66A0049](https://openairdocs.org/ntsb/DEN66A0049), Dec 18, 1965: Hiller UH12L4 (N9780C), Albuquerque, NM, destroyed
- [NTSB DEN66A0041](https://openairdocs.org/ntsb/DEN66A0041), Dec 6, 1965: Hiller UH12L4 (N9780C), Albuquerque, NM, 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.

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