# NTSB OAK76FVM01: Enstrom F28A, N4893, San Francisco, CA, July 5, 1975

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 5, 1975
- Place: San Francisco, CA · SAN FRANCISCO, CA
- Location: 37.7750° N, 122.4194° W: Placed by OpenAirDocs: center of San Francisco, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.7750&lon=-122.4194&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report March 1, 1976
- Report: Brief approved by the director
- NTSB case key (mKey): 150449
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK76FVM01
- Page: https://openairdocs.org/ntsb/OAK76FVM01

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4031   75/7/5    SAN FRANCISCO,CA    ENSTROM F28A        CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 25, 2052
        TIME - 1610                    N4893               PX-  0  0  2  CTR PASSG-D               TOTAL HOURS, 76 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          SAN FRANCISCO,CA            LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: TAIL ROTOR                      IN FLIGHT: CLIMB TO CRUISE
           ROLL OVER                                                LANDING: POWER-ON LANDING
        PROBABLE CAUSE(S)
           ROTORCRAFT - MISCELLANEOUS UNITS AND ASSEMBLIES: OTHER
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - AIRCRAFT CAME TO REST IN WATER
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON WATER
        REMARKS- LOCAL SIGHTSEEING FLT. TAIL BOOM ATTACH BOLT FAILED.
```

## Aircraft

- Registration: [N4893](https://openairdocs.org/deregistered/N4893-2012-08-08), registration cancelled 2012-08-08, S/N 045, built 1969 (OpenAirDocs)
- Reported make and model: ENSTROM F28A
- Registry model: [Enstrom F-28A](https://openairdocs.org/model/enstrom-f-28a) (registry code 3300406) (OpenAirDocs)
- Registry engine: [Lycoming HO-360 series](https://openairdocs.org/engine/lycoming-ho-360-series) (registry code 41513, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Pier 43 Helipad.

## 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 19750705019359A](https://openairdocs.org/incident/19750705019359A), Jul 5, 1975: Enstrm F28A, San Francisco, CA, Substantial damage. Local sightseeing flt. Tail boom attach bolt failed.

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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