# NTSB SEA67D0092: Grumman TBM-3E, N3969A, Potomac, MT, July 25, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 25, 1966
- Place: Potomac, MT · POTOMAC, MT
- Location: 46.8813° N, 113.5751° W: Placed by OpenAirDocs: center of Potomac, MT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=46.8813&lon=-113.5751&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report March 24, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 121335
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA67D0092
- Page: https://openairdocs.org/ntsb/SEA67D0092

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3974  66/7/25    POTOMAC MONT        GRUMMAN TBM-3E      CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 44, 4700
        TIME - 1700                    N3969A              PX-  0  0  0  ASSOC FIRE CTL ACTIVITY   TOTAL HOURS, 530 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           WHEELS-UP                                                LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: PISTON,PISTON RINGS
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- NO.14 PISTON FAILED.PLT LANDED WHEELS UP INTENTIONALLY.
```

## Aircraft

- Registration: [N3969A](https://openairdocs.org/aircraft/N3969A), registered now, S/N 53787, built 1945 (OpenAirDocs)
- Reported make and model: GRUMMAN TBM-3E
- Registry model: [Grumman TBM-3E](https://openairdocs.org/model/grumman-tbm-3e) (registry code 3950310) (OpenAirDocs)
- Registry engine: [Wright R-2600-20](https://openairdocs.org/engine/wright-r-2600-20) (registry code 67123, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- 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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