# NTSB ANC76FAA29: Stinson 108-3, N6946M, Koyuk, AK, March 21, 1976

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: March 21, 1976
- Place: Koyuk, AK · KOYUK, AK
- Location: 64.9413° N, 161.1451° W: Placed by OpenAirDocs: center of Koyuk, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=64.9413&lon=-161.1451&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 1 uninjured
- Status: Completed, report January 11, 1977
- Report: Brief approved by the director
- NTSB case key (mKey): 153594
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC76FAA29
- Page: https://openairdocs.org/ntsb/ANC76FAA29

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3453  76/3/21  NR.KOYUK,AK           STINSON 108-3       CR-  0  1  1  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 0930                    N6946M              PX-  0  0  0  DUAL                      AGE 32, 1400 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            1 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          GALENA,AK                   NOME,AK
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           NOSE OVER/DOWN                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           POWERPLANT - LUBRICATING SYSTEM: LINES,HOSES,FITTING
           MISCELLANEOUS ACTS,CONDITIONS - OIL EXHAUSTION-ENGINE LUBRICATION SYSTEM
           MISCELLANEOUS ACTS,CONDITIONS - OVERHEATED
           MISCELLANEOUS ACTS,CONDITIONS - PRESSURE,NONE
           TERRAIN - ROUGH/UNEVEN
           TERRAIN - SNOW-COVERED
        FACTOR(S)
           PILOT IN COMMAND - LACK OF FAMILIARITY WITH AIRCRAFT
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- HOSE BETWEEN OIL COOLER & PRESS REGULATOR VALVE RUPTURED.
```

## Aircraft

- Registration: [N6946M](https://openairdocs.org/deregistered/N6946M-2014-09-03), registration cancelled 2014-09-03, S/N 108-4946, built 1949 (OpenAirDocs)
- Reported make and model: STINSON 108-3
- Registry model: [Stinson 108-3](https://openairdocs.org/model/stinson-108-3) (registry code 9230408) (OpenAirDocs)
- Registry engine: [Franklin 6A4165 series](https://openairdocs.org/engine/franklin-6a4165-series) (registry code 27025, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- 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 19760321009179A](https://openairdocs.org/incident/19760321009179A), Mar 21, 1976: Univar 1083, Koyuk, AK, Substantial damage. Hose between oil cooler & press regulator valve ruptured.

## Other investigations on N6946M (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 FTW71DPJ39](https://openairdocs.org/ntsb/FTW71DPJ39), Apr 9, 1971: Stinson 108-3 (N6946M), Shattuck, OK, 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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