# NTSB SEA79FYM48: Hughes 369D, N8600F, Cascadia, OR, August 14, 1978

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: August 14, 1978
- Place: Cascadia, OR · CASCADIA, OR
- Location: 44.3930° N, 122.5026° W: Placed by OpenAirDocs: center of Cascadia, OR, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.3930&lon=-122.5026&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed, report April 9, 1979
- Report: Brief approved by the director
- NTSB case key (mKey): 202537
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA79FYM48
- Page: https://openairdocs.org/ntsb/SEA79FYM48-202537

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4204  78/8/14  NR.CASCADIA,OR        HUGHES 369D         CR-  0  1  0  COMMERCIAL                COMMERCIAL, AGE 37, 6483
        TIME - 0915                    N8600F              PX-  0  0  0  OTHER                     TOTAL HOURS, 305 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         CASCADIA,OR                  LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      LANDING: FINAL APPROACH
           ROLL OVER                                                LANDING: POWER-ON LANDING
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: TAIL ROTOR GEAR BOX
           MISCELLANEOUS ACTS,CONDITIONS - VIBRATION,EXCESSIVE
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
        FACTOR(S)
           TERRAIN - ROUGH/UNEVEN
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- T/R HINGE BEARINGS WORN,VIBRATION ALLOWED T/R HUB TO FAIL. T/R SEPARATED. LOGGING OPS.
```

## Aircraft

- Registration: [N8600F](https://openairdocs.org/deregistered/N8600F-1980-02-28), registration cancelled 1980-02-28, S/N 470108D, built 1977 (OpenAirDocs)
- Reported make and model: HUGHES 369D
- Registry model: [Hughes Helicopters HUGHES 369D](https://openairdocs.org/model/hughes-helicopters-hughes-369d) (registry code 4470706) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- Damage: Destroyed

## 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 19780814043219A](https://openairdocs.org/incident/19780814043219A), Aug 14, 1978: Hughes 369HE, Cascadia, OR, Destroyed. T/r hinge bearings worn,vibration allowed t/r hub to fail. T/r seted. Logging ops.

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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