# NTSB ANC69A0038: Bell 205A, N4048G, Tyonek, AK, January 26, 1969

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: January 26, 1969
- Place: Tyonek, AK · TYONEK, AK
- Location: 61.0681° N, 151.1369° W: Placed by OpenAirDocs: center of Tyonek, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=61.0681&lon=-151.1369&mi=10
- Phase of flight: [Uncontrolled descent](https://openairdocs.org/ntsb-phases/650) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed, report September 2, 1969
- Report: Brief approved by the director
- NTSB case key (mKey): 191254
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC69A0038
- Page: https://openairdocs.org/ntsb/ANC69A0038

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2144  69/1/26  NR.TYONEK,ALAS        BELL 205A           CR-  1  0  0  COMMERCIAL                COMMERCIAL, AGE 26, 2165
        TIME - 1243                    N4048G              PX-  1  0  0  AIR TAXI-PASSG            TOTAL HOURS, 2122 IN
                                       DAMAGE-DESTROYED    OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           SYSTEMS - FLIGHT CONTROL SYSTEMS: FLIGHT CONTROL BOOST SYSTEMS, HYDRAULIC
           ROTORCRAFT - FLIGHT CONTROL SYSTEMS: CYCLIC PITCH CONTROL SYSTEM
           ROTORCRAFT - FLIGHT CONTROL SYSTEMS: COLLECTIVE PITCH CONTROL SYSTEM
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPER/INADEQUATE VENTING
           MISCELLANEOUS ACTS,CONDITIONS - JAMMED
           WEATHER - ICING CONDITIONS-INCLUDES SLEET,FREEZING RAIN,ETC.
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: POOR/INADEQUATE DESIGN
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - AIRCRAFT CAME TO REST IN WATER
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        WEATHER FORECAST - UNKNOWN/NOT REPORTED
        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                                                      15
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
        REMARKS- MOISTURE IN SERVO CYL VENT PORTS FROZE,PILOT VALVES BELOW PORTS BECAME INOP CAUSED CONTROL LOCK-UP
```

## Aircraft

- Registration: [N4048G](https://openairdocs.org/deregistered/N4048G-1971-03-12), registration cancelled 1971-03-12, S/N 30010 (OpenAirDocs)
- Reported make and model: BELL 205A
- Registry model: [Bell 205A](https://openairdocs.org/model/bell-205a) (registry code 1181413) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- Damage: 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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