# NTSB OAK75AP056: Hiller Acft FH1100, N439F, Fremont, CA, June 27, 1975

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: June 27, 1975
- 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: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed, report January 14, 1976
- Report: Brief approved by the director
- Safety recommendations: Yes
- NTSB case key (mKey): 79863
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK75AP056
- Page: https://openairdocs.org/ntsb/OAK75AP056

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3654  75/6/27    FREMONT,CA          HILLER ACFT FH1100  CR-  2  0  0  MISCELLANEOUS             COMMERCIAL, AGE 30, 2982
        TIME - 1348                    N439F               PX-  0  0  0  POLICE PATROL             TOTAL HOURS, 1248 IN
                                       DAMAGE-DESTROYED    OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - SKY SAILING
        DEPARTURE POINT             INTENDED DESTINATION
          SAN JOSE,CA                 OAKLAND,CA
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: MAIN ROTOR                      IN FLIGHT: NORMAL CRUISE
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           ROTORCRAFT - FLIGHT CONTROL SYSTEMS: CYCLIC PITCH CONTROL SYSTEM
           MISCELLANEOUS ACTS,CONDITIONS - MISSING
         FIRE AFTER IMPACT
        REMARKS- BOLT CAME LOOSE FRM AFT CYCLIC BELLCRANK ASSY.
```

## Aircraft

- Registration: [N439F](https://openairdocs.org/deregistered/N439F-1976-05-21), registration cancelled 1976-05-21, S/N 157 (OpenAirDocs)
- Reported make and model: HILLER ACFT FH1100
- Registry model: [Fairchild Hiller FH-1100](https://openairdocs.org/model/fairchild-hiller-fh-1100) (registry code 3376502) (OpenAirDocs)
- Category: Helicopter
- Engines: turbo shaft
- Damage: Destroyed
- Airport: Sky Sailing

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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