# NTSB ANC66A0049: Hiller UH12EL, N9786C, Dillingham, AK, June 21, 1966

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: June 21, 1966
- Place: Dillingham, AK · DILLINGHAM, AK
- Location: 59.0397° N, 158.4575° W: Placed by OpenAirDocs: center of Dillingham, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=59.0397&lon=-158.4575&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 3 minor
- Status: Completed, report March 15, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 171127
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC66A0049
- Page: https://openairdocs.org/ntsb/ANC66A0049

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0604  66/6/21  NR.DILLINGHAM ALAS    HILLER UH12EL       CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 28, 2100
        TIME - 1540                    N9786C              PX-  0  0  2  CTR PASSG-D               TOTAL HOURS, 500 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            LANDING: FINAL APPROACH
           ROLL OVER                                                LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: MASTER AND CONNECTING RODS
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           MISCELLANEOUS ACTS,CONDITIONS - LACK OF LUBRICATION-SPECIFIC PART,NOT SYSTEM
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPER MAINTENANCE (OWNER PERSONNEL)
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- BLM SURVEY.NO.5 AND NO.6 CONNECTING RODS,PN75548,BROKEN.ENG-124 HRS SOH.NOT PROPERLY ASSEMBLED.
```

## Aircraft

- Registration: [N9786C](https://openairdocs.org/deregistered/N9786C-2015-04-30), registration cancelled 2015-04-30, S/N 2267, built 1963 (OpenAirDocs)
- Reported make and model: HILLER UH12EL
- 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 N9786C (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 SEA78FYM06](https://openairdocs.org/ntsb/SEA78FYM06), Nov 3, 1977: Hiller Acft UH-12E (N9786C), Depoe Bay, OR, 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.