# NTSB OAK73DVD27: Schweizer SGS233, N7547, Fremont, CA, March 20, 1973

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: March 20, 1973
- Place: Fremont, CA · FREMONT, CA
- Location: 37.5483° N, 121.9886° W: Placed by OpenAirDocs: center of Fremont, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.5483&lon=-121.9886&mi=10
- Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 1 uninjured
- Status: Completed, report May 18, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 170262
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK73DVD27
- Page: https://openairdocs.org/ntsb/OAK73DVD27

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0716  73/3/20    FREMONT,CALIF       SCHWEIZER SGS233    CR-  0  0  2  INSTRUCTIONAL             COMMERCIAL, AGE 25, 105
        TIME - 1000                    N7547               PX-  0  0  0  DUAL                      TOTAL HOURS, 75 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - FREMONT SKY
        DEPARTURE POINT             INTENDED DESTINATION
          FREMONT,CALIF               LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           NOSE OVER/DOWN                                           STATIC: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - EXERCISED POOR JUDGMENT
           WEATHER - LOCAL WHIRLWIND
        FACTOR(S)
           PILOT IN COMMAND - INADEQUATE PREFLIGHT PREPARATION AND/OR PLANNING
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        WEATHER FORECAST - UNKNOWN/NOT REPORTED
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          UNKNOWN/NOT REPORTED                                      2000
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     RAIN
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          NONE                                                      55
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          150                                                       10
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
        REMARKS- FLIPPED OVER PRIOR TO TKOF ROLL.
```

## Aircraft

- Registration: [N7547](https://openairdocs.org/aircraft/N7547), registered now, S/N 177, built 1970 (OpenAirDocs)
- Reported make and model: SCHWEIZER SGS233
- Registry model: [Schweizer SGS 2-33A](https://openairdocs.org/model/schweizer-sgs-2-33a) (registry code 8051606) (OpenAirDocs)
- Registry engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000, none) (OpenAirDocs)
- Category: Glider
- Engines: none
- Damage: Substantial damage
- Airport: Fremont Sky

## 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 19730320007489A](https://openairdocs.org/incident/19730320007489A), Mar 20, 1973: Scwzer SGS233A, Fremont, CA, Substantial damage. Flipped over prior to tkof roll.

## Other investigations on N7547 (2)

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.

- [NTSB WPR20CA273](https://openairdocs.org/ntsb/WPR20CA273), Aug 14, 2020: Schweizer SGS233 (N7547), Warner Springs, CA, substantial damage. Probable cause: The pilot's inability to maintain altitude due to a loss of thermal lift, which resulted in an off-airport landing.
- [NTSB LAX83LA145](https://openairdocs.org/ntsb/LAX83LA145), Mar 7, 1983: Schweizer SGS2-33A (N7547), Fremont, CA, minor 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.

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