# NTSB DEN75AD050: Boeing 737, N4527W, Casper, WY, March 31, 1975

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: March 31, 1975
- Place: Casper, WY · CASPER, WY
- Location: 42.8421° N, 106.3213° W: Placed by OpenAirDocs: center of Casper, WY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.8421&lon=-106.3213&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 3 minor, 95 uninjured
- Status: Completed, report December 10, 1975
- Safety recommendations: Yes
- NTSB case key (mKey): 79443
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN75AD050
- Board report AAR7515 (PDF): https://www.ntsb.gov/investigations/AccidentReports/Reports/AAR7515.pdf
- Page: https://openairdocs.org/ntsb/DEN75AD050

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0001  75/3/31    CASPER,WY           BOEING 737          CR-  0  0  6  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 0743                    N4527W              PX-  0  1 92                            38, 6698 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            2000 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - NATRONA COUNTY
        OPERATOR - WESTERN AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          DENVER,CO                   MINNEAPOLIS,MN
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           OVERSHOOT                                                LANDING: LEVEL OFF/TOUCHDOWN
           COLLIDED WITH: DITCHES                                   LANDING: ROLL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - MISJUDGED DISTANCE,SPEED,AND ALTITUDE
           PILOT IN COMMAND - FAILED TO INITIATE GO-AROUND
        FACTOR(S)
           COPILOT - FAILED TO FOLLOW APPROVED PROCEDURES,DIRECTIVES,ETC.
           PERSONNEL - THIRD PILOT: FAILURE TO FOLLOW INSTUCTIONS
           AIRPORTS/AIRWAYS/FACILITIES - AIRPORT CONDITIONS: SNOW ON RUNWAY
           WEATHER - LOW CEILING
           WEATHER - SNOW
           MISCELLANEOUS ACTS,CONDITIONS - DOWNWIND
           MISCELLANEOUS ACTS,CONDITIONS - RAN OFF END OF RUNWAY
        WEATHER BRIEFING - COMPANY DISPATCH
        WEATHER FORECAST - WEATHER SLIGHTLY WORSE THAN FORECAST
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          OBSCURATION                                               500
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          1 MILE OR LESS                                           SNOW
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  RELATIVE BEARING OF WIND
          NONE                                                     TAIL WIND 158-202 DEGREES
        TEMPERATURE-F                                            WIND DIRECTION-DEGREES
           23                                                       50
        WIND VELOCITY-KNOTS                                      TYPE OF WEATHER CONDITIONS
           8                                                       IFR
        TYPE OF FLIGHT PLAN
          IFR
        REMARKS- REQUIRED CALLOUTS NOT PROVIDED TO PIC.TOUCHED DOWN ABT 2375FT FRM DEP END OF 8681FT RWY.
```

## Aircraft

- Registration: [N4527W](https://openairdocs.org/deregistered/N4527W-1975-06-04), registration cancelled 1975-06-04, S/N 20131, built 1969 (OpenAirDocs)
- Reported make and model: BOEING 737
- Registry model: [Boeing 737-247](https://openairdocs.org/model/boeing-737-247) (registry code 138448D) (OpenAirDocs)
- Category: Airplane
- Engines: turbo fan
- Damage: Substantial damage
- Airport: Natrona County

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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