# NTSB DEN71AD030: Beech B23, N4027T, Mammoth, UT, January 2, 1971

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: January 2, 1971
- Place: Mammoth, UT · MAMMOTH, UT
- Location: 39.9263° N, 112.1263° W: Placed by OpenAirDocs: center of Mammoth, UT, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.9263&lon=-112.1263&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal, 2 serious
- Status: Completed, report October 13, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 159483
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN71AD030
- Page: https://openairdocs.org/ntsb/DEN71AD030

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0128   71/1/2    MAMMOTH,UT          BEECH B23           CR-  1  0  0  NONCOMMERCIAL             PRIVATE, AGE 34, 546
        TIME - 1815                    N4027T              PX-  0  2  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 520 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          DELTA,UT                    SALT LAKE CITY,UT
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: CONTROLLED                  IN FLIGHT: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - CONTINUED VFR FLIGHT INTO ADVERSE WEATHER CONDITIONS
        FACTOR(S)
           WEATHER - LOW CEILING
           WEATHER - SNOW
           WEATHER - ICING CONDITIONS-INCLUDES SLEET,FREEZING RAIN,ETC.
           WEATHER - TURBULENCE, ASSOCIATED W/CLOUDS AND/OR THUNDERSTORMS
        WEATHER BRIEFING - BRIEFED BY FLIGHT SERVICE PERSONNEL, IN PERSON
        WEATHER FORECAST - FORECAST SUBSTANTIALLY CORRECT
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          PARTIAL OBSCURATION                                       800
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          1/2 MILE OR LESS                                         SNOW
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TYPE OF WEATHER CONDITIONS
          BLOWING SNOW                                             VFR
        TYPE OF FLIGHT PLAN
          VFR
        REMARKS- STRUCK GRND DURG ATMTD TURNAROUND. DARK NIGHT.
```

## Aircraft

- Registration: [N4027T](https://openairdocs.org/deregistered/N4027T-1971-02-09), registration cancelled 1971-02-09, S/N M-1133 (OpenAirDocs)
- Reported make and model: BEECH B23
- Registry model: [Beech B23](https://openairdocs.org/model/beech-b23) (registry code 1151240) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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