# NTSB DEN81FTA04: Bell 206B, N8533K, Columbus, MT, January 28, 1981

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: January 28, 1981
- Place: Columbus, MT · COLUMBUS, MT
- Location: 45.6360° N, 109.2488° W: Placed by OpenAirDocs: center of Columbus, MT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=45.6360&lon=-109.2488&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 3 minor, 1 uninjured
- Status: Completed, report March 16, 1981
- Report: Brief approved by the director
- NTSB case key (mKey): 127252
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN81FTA04
- Page: https://openairdocs.org/ntsb/DEN81FTA04

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0125  81/1/28  NR.COLUMBUS,MT        BELL 206B           CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, FL.INSTR.,
        TIME - 0830                    N8533K              PX-  0  0  3  PLEASURE/PERSONAL TRANSP  AGE 47, 6779 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            61 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          BILLINGS,MT                 BIG TIMBER,MT
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      IN FLIGHT: NORMAL CRUISE
           HARD LANDING                                             LANDING: POWER-ON LANDING
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: TAIL ROTOR DRIVE SHAFT ASSEMBLY
           MISCELLANEOUS ACTS,CONDITIONS - PREVIOUS DAMAGE
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        FACTOR(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
                                  DIRECTIONAL CONTROL PROBLEM
        REMARKS- FRACTURE CONSISTENT WITH SHEAR RESULTING FROM RESISTANCE OF T/R TO ENG FORCE.PREEXISTG CORR ATTACK
```

## Aircraft

- Registration: [N8533K](https://openairdocs.org/deregistered/N8533K-2013-06-27), registration cancelled 2013-06-27, S/N 80, built 1968 (OpenAirDocs)
- Reported make and model: BELL 206B
- Registry model: [Bell 206B](https://openairdocs.org/model/bell-206b) (registry code 1181511) (OpenAirDocs)
- Registry engine: [Allison 250 SER 250HP](https://openairdocs.org/engine/allison-250-ser-250hp) (registry code 03002, turbo-shaft) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- Damage: 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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