# NTSB DEN73AD057: Boeing 737, N4508W, W.Yellowstne, MT, June 29, 1973

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: June 29, 1973
- Place: W.Yellowstne, MT · W.YELLOWSTNE, MT
- Location: 44.6622° N, 111.1070° W: Placed by OpenAirDocs: center of West Yellowstone, MT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=44.6622&lon=-111.1070&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 2 minor, 36 uninjured
- Status: Completed, report August 23, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 169496
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN73AD057
- Page: https://openairdocs.org/ntsb/DEN73AD057

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0016  73/6/29  NR.W.YELLOWSTNE,MONT  BOEING 737          CR-  0  1  4  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 1607                    N4508W              PX-  0  0 34                            38, 7810 TOTAL HOURS, 710
                                       DAMAGE-NONE         OT-  0  0  0                            IN TYPE, INSTRUMENT
                                                                                                   RATED.
        OPERATOR - WESTERN AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          GREAT FALLS,MONT            SALT LAKE CITY,UT           W.YELLOWSTNE,MONT
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           TURBULENCE                                               IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           WEATHER - TURBULENCE, ASSOCIATED W/CLOUDS AND/OR THUNDERSTORMS
           PERSONNEL - FLIGHT PERSONNEL
           MISCELLANEOUS ACTS,CONDITIONS - SEAT BELT NOT FASTENED
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEAT BELT SIGN ON
        WEATHER BRIEFING - COMPANY DISPATCH
        WEATHER FORECAST - FORECAST SUBSTANTIALLY CORRECT
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          BROKEN                                                    8000
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          1/4 MILE OR LESS                                          THUNDERSTORM, RAIN SHOWERS
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TYPE OF WEATHER CONDITIONS
          NONE                                                     IFR
        TYPE OF FLIGHT PLAN
          IFR
        REMARKS- FLT ATTNDT DISREGARDED SEAT BELT SIGN & P/A WARNING.
```

## Aircraft

- Registration: N4508W (not matched to a registry record)
- Reported make and model: BOEING 737
- Category: Airplane
- Engines: turbo fan
- Damage: No 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.

---
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.