# NTSB LAX77FUG01: Grum Amer AA-5B, N74110, Big Bear City, CA, October 1, 1976

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: October 1, 1976
- Place: Big Bear City, CA · BIG BEAR CITY, CA
- Location: 34.2611° N, 116.8450° W: Placed by OpenAirDocs: center of Big Bear City, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=34.2611&lon=-116.8450&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious
- Status: Completed, report October 29, 1976
- Report: Brief approved by the director
- NTSB case key (mKey): 155259
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX77FUG01
- Page: https://openairdocs.org/ntsb/LAX77FUG01

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2723   76/10/1 NR.BIG BEAR CITY,CA   GRUM AMER AA-5B     CR-  0  1  0  NONCOMMERCIAL             COMMERCIAL, AGE 26, 1606
        TIME - 1000                    N74110              PX-  0  1  0  AERIAL SURVEY             TOTAL HOURS, 128 IN TYPE,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
         BIG BEAR CITY,CA             LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLIDED WITH: TREES                                     IN FLIGHT: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER IN-FLIGHT DECISIONS OR PLANNING
           WEATHER - DOWNDRAFT,UPDRAFTS
        FACTOR(S)
           WEATHER - HIGH DENSITY ALTITUDE
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        WEATHER FORECAST - UNKNOWN/NOT REPORTED
        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                                                      50
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          180                                                       10
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      NONE
        REMARKS- LOW SLOW FLT 200FT AGL. ENCNTRD DOWNDRAFT. D/A ABT 8100FT.
```

## Aircraft

- Registration: [N74110](https://openairdocs.org/deregistered/N74110-2022-06-04), registration cancelled 2022-06-04, S/N AA5B-0146, built 1975 (OpenAirDocs)
- Reported make and model: GRUM AMER AA-5B
- Registry model: [Grumman American Avn. AA-5B](https://openairdocs.org/model/grumman-american-avn-aa-5b) (registry code 3960105) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

## 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 19761001030669A](https://openairdocs.org/incident/19761001030669A), Oct 1, 1976: Grumav AA5B, Big Bear City, CA, Destroyed. Low slow flt 200FT AGL. Encntrd downdraft. D/a abt 8100FT.

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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