# NTSB MIA70FKW04: Stinson 108-1, N8721K, Knoxville, TN, April 4, 1970

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: April 4, 1970
- Place: Knoxville, TN · KNOXVILLE, TN
- Location: 35.9606° N, 83.9207° W: Placed by OpenAirDocs: center of Knoxville, TN, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=35.9606&lon=-83.9207&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report January 5, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 128493
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA70FKW04
- Page: https://openairdocs.org/ntsb/MIA70FKW04

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1662   70/4/4    KNOXVILLE,TENN      STINSON 108-1       CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, FL.INSTR.,
        TIME - 1730                    N8721K              PX-  0  0  1  PLEASURE/PERSONAL TRANSP  AGE 45, 915 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            3 IN TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - SKY RANCH
        DEPARTURE POINT             INTENDED DESTINATION
          KNOXVILLE,TENN              LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            LANDING: FINAL APPROACH
           COLLISION WITH GROUND/WATER: CONTROLLED                  LANDING: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF POWERPLANT & POWERPLANT CONTROLS
           PILOT IN COMMAND - LACK OF FAMILIARITY WITH AIRCRAFT
           MISCELLANEOUS ACTS,CONDITIONS - FUEL STARVATION
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - AIRCRAFT CAME TO REST IN WATER
        EMERGENCY CIRCUMSTANCES - FORCED LANDING ON AIRPORT/SEAPLANE BASE/HELIPT.
        REMARKS- PULLED MIXTURE CTL INSTEAD OF CARB HEAT CTL.UN RESTART ENG.LNDD APRX 50FT SHORT OF RWY,ACFT SANK.
```

## Aircraft

- Registration: [N8721K](https://openairdocs.org/deregistered/N8721K-2013-11-15), registration cancelled 2013-11-15, S/N 108-1721, built 1947 (OpenAirDocs)
- Reported make and model: STINSON 108-1
- Registry model: [Stinson 108-1](https://openairdocs.org/model/stinson-108-1) (registry code 9230404) (OpenAirDocs)
- Registry engine: [Franklin 6A4150 series](https://openairdocs.org/engine/franklin-6a4150-series) (registry code 27024, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Sky Ranch

## Other investigations on N8721K (2)

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 ERA13LA327](https://openairdocs.org/ntsb/ERA13LA327), Jul 17, 2013: Univair 108-1 (N8721K), Tuftonboro, NH, substantial damage. Probable cause: Maintenance personnel’s failure to remove circumferential gouges in the aft radius of the R2 rod journal on the crankshaft during its last engine overhaul, which resulted in the fatigue failure of…
- [NTSB IAD75FIG14](https://openairdocs.org/ntsb/IAD75FIG14), Feb 22, 1975: Stinson 108-1 (N8721K), Edgewater, MD, 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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