# NTSB OAK78DXQ13: Beech C50, N3693B, Mammoth Lakes, CA, March 9, 1978

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: March 9, 1978
- Place: Mammoth Lakes, CA · MAMMOTH LAKES, CA
- Location: 37.6244° N, 118.9884° W: Placed by OpenAirDocs: center of Mammoth Lakes, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.6244&lon=-118.9884&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed, report April 24, 1978
- Report: Brief approved by the director
- NTSB case key (mKey): 143221
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK78DXQ13
- Page: https://openairdocs.org/ntsb/OAK78DXQ13

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0474   78/3/9  NR.MAMMOTH LAKES,CA   BEECH C50           CR-  0  1  0  NONCOMMERCIAL             ATP,FLIGHT INSTR., AGE
        TIME - 0826                    N3693B              PX-  0  0  0  CORP/EXEC                 53, 20239 TOTAL HOURS,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            5782 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - MAMMOTH LAKES
        DEPARTURE POINT             INTENDED DESTINATION
          BISHOP,CA                  MAMMOTH LAKES,CA
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: UNCONTROLLED                LANDING: TRAFFIC PATTERN-CIRCLING
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - CONTINUED VFR FLIGHT INTO ADVERSE WEATHER CONDITIONS
           PILOT IN COMMAND - SPATIAL DISORIENTATION
           MISCELLANEOUS ACTS,CONDITIONS - WHITEOUT
        FACTOR(S)
           WEATHER - FOG
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          OBSCURATION                                               300
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          3 MILES OR LESS                                          NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TYPE OF WEATHER CONDITIONS
          FOG                                                      IFR
        TYPE OF FLIGHT PLAN
          NONE
        REMARKS- AIRPORT DOES NOT HAVE ANY ELECTRONIC LANDING AIDS.
```

## Aircraft

- Registration: [N3693B](https://openairdocs.org/deregistered/N3693B-1981-03-24), registration cancelled 1981-03-24, S/N CH-129 (OpenAirDocs)
- Reported make and model: BEECH C50
- Registry model: [Beech C-50](https://openairdocs.org/model/beech-c-50) (registry code 1152510) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed
- Airport: Mammoth Lakes

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19780309004409A](https://openairdocs.org/incident/19780309004409A), Mar 9, 1978: Beech C50, Mammoth Lakes, CA, Destroyed. Airport does not have any electronic landing aids.

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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