# NTSB OAK67F0166: Helio Acft H-391B, N4109D, Oakland, CA, November 15, 1966

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: November 15, 1966
- Place: Oakland, CA · OAKLAND, CA
- Location: 37.8044° N, 122.2708° W: Placed by OpenAirDocs: center of Oakland, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.8044&lon=-122.2708&mi=10
- Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report January 30, 1967
- Report: Brief approved by the director
- NTSB case key (mKey): 120237
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK67F0166
- Page: https://openairdocs.org/ntsb/OAK67F0166

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3651  66/11/15   OAKLAND CALIF       HELIO ACFT H-391B   CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 57, 640
        TIME - 1400                    N4109D              PX-  0  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 13 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        NAME OF AIRPORT - OAKLAND INT'L
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLIDED WITH: PARKED AIRCRAFT                           TAXI: TO TAKEOFF
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF POWERPLANT & POWERPLANT CONTROLS
           AIRFRAME - LANDING GEAR: BRAKING SYSTEM (NORMAL SYSTEM)
           SYSTEMS - HYDRAULIC SYSTEM: SEALS
           MISCELLANEOUS ACTS,CONDITIONS - LEAK/LEAKAGE
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - CONGESTED TRAFFIC-PATTERN
        REMARKS- PARKED AIRCRAFT-CESSNAS N4097J AND N2233J SUBST ANTIAL,N1763F AND N3749J MINOR DAMAGE.
```

## Aircraft

- Registration: [N4109D](https://openairdocs.org/deregistered/N4109D-1970-06-30), registration cancelled 1970-06-30, S/N 026 (OpenAirDocs)
- Reported make and model: HELIO ACFT H-391B
- Registry model: [Helio H-391B](https://openairdocs.org/model/helio-h-391b) (registry code 4300106) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Oakland Int'L

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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