# NTSB DEN81FA035: Bell 206B, N39101, Evanston, WY, May 18, 1981

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: May 18, 1981
- Place: Evanston, WY · EVANSTON, WY
- Location: 41.2594° N, 110.9643° W: Placed by OpenAirDocs: center of Evanston, WY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.2594&lon=-110.9643&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal, 2 serious, 1 minor
- Status: Completed, report March 18, 1982
- Report: Brief approved by the director
- NTSB case key (mKey): 125362
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN81FA035
- Page: https://openairdocs.org/ntsb/DEN81FA035-125362

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3543  81/5/18  NR.EVANSTON,WY        BELL 206B           CR-  0  1  0  COMMERCIAL                COMMERCIAL, AGE 35, 5580
        TIME - 1715                    N39101              PX-  1  1  1  AIR TAXI-PASSG            TOTAL HOURS, 1000 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         EVANSTON,WY                  LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            TAKEOFF: INITIAL CLIMB
           ROLL OVER                                                LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: INCORRECT FACTORY INSTALLATION
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
           POWERPLANT - FUEL SYSTEM: OTHER
           MISCELLANEOUS ACTS,CONDITIONS - UNDER TORQUED
           MISCELLANEOUS ACTS,CONDITIONS - LEAK/LEAKAGE
        FACTOR(S)
           WEATHER - HIGH DENSITY ALTITUDE
           TERRAIN - ROUGH/UNEVEN
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          NONE                                                      55
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          140                                                       10
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
        REMARKS- AIR LEAK AT LOOSE B-NUT ON HOSE ASSY TO GOV ACCUMULATOR,PN 6886430.WND GSTG 15KTS.D/A APRX 8500FT.
```

## Aircraft

- Registration: [N39101](https://openairdocs.org/aircraft/N39101), registered now, S/N 3289, built 1981 (OpenAirDocs)
- Reported make and model: BELL 206B
- Registry model: [Bell 206B](https://openairdocs.org/model/bell-206b) (registry code 1181511) (OpenAirDocs)
- Registry engine: [Rolls-Royce 250-C20B](https://openairdocs.org/engine/rolls-royce-250-c20b) (registry code 54385, turbo-shaft) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- Damage: Substantial damage

## 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 19810518026689A](https://openairdocs.org/incident/19810518026689A), May 18, 1981: Bell 206B, Evanston, WY, Substantial damage, 1 fatal. B nut on pg air to fuel control loose. Caused engine power loss at low altitude. No time to autorotate.

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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