# NTSB OAK68D0331: Entwicklung 1-A, N1315, Calistoga, CA, February 10, 1968

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: February 10, 1968
- Place: Calistoga, CA · CALISTOGA, CA
- Location: 38.5814° N, 122.5827° W: Placed by OpenAirDocs: center of Calistoga, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=38.5814&lon=-122.5827&mi=10
- Phase of flight: [Uncontrolled descent](https://openairdocs.org/ntsb-phases/650) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report April 25, 1968
- Report: Brief approved by the director
- NTSB case key (mKey): 111385
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK68D0331
- Page: https://openairdocs.org/ntsb/OAK68D0331

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0559  68/2/10    CALISTOGA,CALIF     ENTWICKLUNG 1-A     CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 37, 300
        TIME - 1600                    N1315               PX-  0  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 87 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            NOT INSTRUMENT RATED.
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER IN-FLIGHT DECISIONS OR PLANNING
           WEATHER - DOWNDRAFT,UPDRAFTS
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          NONE                                                      60
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          225                                                       10
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
        REMARKS- CAUGHT IN DOWNDRAFT WITH INSUFFICIENT ALTITUDE TO RECOVER.
```

## Aircraft

- Registration: N1315 (not matched to a registry record)
- Reported make and model: ENTWICKLUNG 1-A
- Category: Glider
- Engines: none
- 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.

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