# NTSB DEN71FXA05: Boeing TB-17F, N1340N, Dubois, WY, August 18, 1970

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: August 18, 1970
- Place: Dubois, WY · DUBOIS, WY
- Location: 43.5461° N, 109.6480° W: Placed by OpenAirDocs: center of Dubois, WY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=43.5461&lon=-109.6480&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed, report March 15, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 113651
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN71FXA05
- Page: https://openairdocs.org/ntsb/DEN71FXA05

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2288  70/8/18    DUBOIS,WYO          BOEING TB-17F       CR-  2  0  0  COMMERCIAL                COMMERCIAL, FL.INSTR.,
        TIME - 1637                    N1340N              PX-  0  0  0  FIRE CONTROL              AGE 52, 8000 TOTAL HOURS,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            105 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          CODY,WYO                    LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           STALL: MUSH                                              IN FLIGHT: SWATH RUN
           COLLIDED WITH: TREES                                     IN FLIGHT: PULLUP FROM SWATH RUN
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - MISJUDGED ALTITUDE AND CLEARANCE
           PILOT IN COMMAND - FAILED TO OBTAIN/MAINTAIN FLYING SPEED
        FACTOR(S)
           WEATHER - DOWNDRAFT,UPDRAFTS
           WEATHER - HIGH DENSITY ALTITUDE
        WEATHER BRIEFING - OTHER
        WEATHER FORECAST - UNKNOWN/NOT REPORTED
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNKNOWN/NOT REPORTED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          UNKNOWN/NOT REPORTED                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          SMOKE                                                     89
        WIND DIRECTION-DEGREES                                   TYPE OF WEATHER CONDITIONS
          225                                                      VFR
        TYPE OF FLIGHT PLAN
          NONE
         FIRE AFTER IMPACT
        REMARKS- FIRE DROP DOWN SLOPE SIDE OF MTN,DOWN WIND RUN.DENSITY ALT APRX 13000FT.WX BRFG,USFS.WIND 25-35MPH
```

## Aircraft

- Registration: [N1340N](https://openairdocs.org/deregistered/N1340N-1971-12-01), registration cancelled 1971-12-01, S/N 42-6107, built 1942 (OpenAirDocs)
- Reported make and model: BOEING TB-17F
- Registry model: [Boeing B-17F](https://openairdocs.org/model/boeing-b-17f) (registry code 1380202) (OpenAirDocs)
- Category: Airplane
- Engines: turbo prop
- 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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.