# NTSB SEA79FT123: Kaman HH-43F, N4524, Hamilton, MT, August 24, 1979

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: August 24, 1979
- Place: Hamilton, MT · HAMILTON, MT
- Location: 46.2526° N, 114.1601° W: Placed by OpenAirDocs: center of Hamilton, MT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=46.2526&lon=-114.1601&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor
- Status: Completed, report March 16, 1981
- Report: Brief approved by the director
- NTSB case key (mKey): 133850
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA79FT123
- Page: https://openairdocs.org/ntsb/SEA79FT123

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4011  79/8/24  NR.HAMILTON,MT        KAMAN HH-43F        CR-  0  0  2  COMMERCIAL                COMMERCIAL, AGE 25, 1710
        TIME - 0930                    N4524               PX-  0  0  0  OTHER                     TOTAL HOURS, 1010 IN
                                       DAMAGE-DESTROYED    OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - LOGGING SITE
        DEPARTURE POINT             INTENDED DESTINATION
         HAMILTON,MT                  LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: HOVERING
           COLLIDED WITH: TREES                                     LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: ENGINE DRIVE SHAFT
           MISCELLANEOUS ACTS,CONDITIONS - EXCESSIVE-WEAR/PLAY
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- PWRSHAFT,PN 1-100-620-01,FAILED.FATIGUE CRACK FND IN AREA OF HVY WEAR.
```

## Aircraft

- Registration: [N4524](https://openairdocs.org/deregistered/N4524-1983-06-29), registration cancelled 1983-06-29, S/N 150, built 1978 (OpenAirDocs)
- Reported make and model: KAMAN HH-43F
- Registry model: [Kaman HH-43 B/F](https://openairdocs.org/model/kaman-hh-43-b-f) (registry code 4800705) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- Damage: Destroyed
- Airport: Logging Site

## 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 19790824027569A](https://openairdocs.org/incident/19790824027569A), Aug 24, 1979: Kaman HH43FCHOPER, Hamilton, MT, Destroyed. Engine failed. The shaft, turbine, p/n 1-100-620-01 had fractured.

## Other investigations on N4524 (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 SEA82FYK08](https://openairdocs.org/ntsb/SEA82FYK08), Feb 22, 1982: Kaman HH-43F (N4524), Sutherlin, OR, destroyed

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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