# NTSB SEA75FYC03: Hiller Acft UH-12E, N104HA, Dayton, OR, July 16, 1974

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 16, 1974
- Place: Dayton, OR · DAYTON, OR
- Location: 45.2199° N, 123.0781° W: Placed by OpenAirDocs: center of Dayton, OR, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=45.2199&lon=-123.0781&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report October 15, 1974
- Report: Brief approved by the director
- NTSB case key (mKey): 130648
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA75FYC03
- Page: https://openairdocs.org/ntsb/SEA75FYC03

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2810  74/7/16    DAYTON,OREG         HILLER ACFT UH-12E  CR-  0  0  1  COMMERCIAL                AIRLINE TRANSPORT, AGE
        TIME - 1200                    N104HA              PX-  0  0  0  ASSOC CROP CTL ACTIVITY   27, 3800 TOTAL HOURS, 190
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            IN TYPE, INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          DAYTON,OREG                 LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: UNCONTROLLED                TAKEOFF: INITIAL CLIMB
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO MAINTAIN ADEQUATE ROTOR R.P.M.
        FACTOR(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPER MAINTENANCE (OWNER PERSONNEL)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: CLUTCH ASSEMBLY
        REMARKS- CLUTCH SHOE WORN.HIGH IDLE RPM.M/R DRIVE SHAFT FAILED DUE TO IMPACT.M/R SYS SEPARATED.
```

## Aircraft

- Registration: [N104HA](https://openairdocs.org/deregistered/N104HA-2012-05-11), registration cancelled 2012-05-11, S/N HA3004, built 1974 (OpenAirDocs)
- Reported make and model: HILLER ACFT UH-12E
- 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
- Airport: Dayton,Ore

## 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 19740716030029A](https://openairdocs.org/incident/19740716030029A), Jul 16, 1974: Hiller UH12E, Dayton, OR, Substantial damage. Clutch shoe worn. High idle RPM.m/r drive shaft failed due to impact.m/r sys separated.

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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