# NTSB ANC71DAG19: Helio Acft H-391B, N4123D, Ninilchik, AK, August 24, 1970

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 24, 1970
- Place: Ninilchik, AK · NINILCHIK, AK
- Location: 60.0514° N, 151.6689° W: Placed by OpenAirDocs: center of Ninilchik, AK, within about 8 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=60.0514&lon=-151.6689&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report October 6, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 107866
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC71DAG19
- Page: https://openairdocs.org/ntsb/ANC71DAG19

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4497  70/8/24  NR.NINILCHIK,ALAS     HELIO ACFT H-391B   CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 48, 591
        TIME - 1800                    N4123D              PX-  0  0  3  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 354 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          POLLY CREEK BEACH           KENAI,ALAS
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLIDED WITH: OBJECT                                    TAKEOFF: RUN
           GEAR COLLAPSED                                           TAKEOFF: RUN
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - INADEQUATE PREFLIGHT PREPARATION AND/OR PLANNING
           PILOT IN COMMAND - SELECTED UNSUITABLE TERRAIN
           TERRAIN - SANDY
        REMARKS- PLT DID NOT CHECK CONDITION OF BEACH PRIOR TO TKOF ATMT. HIT SOFT SPOT IN SAND.
```

## Aircraft

- Registration: [N4123D](https://openairdocs.org/aircraft/N4123D), registered now, S/N 042, built 1957 (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)
- Registry engine: [Lycoming GO-435C&D series](https://openairdocs.org/engine/lycoming-go-435c-d-series) (registry code 41521, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage

## Other investigations on N4123D (1)

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 ANC71DAG83](https://openairdocs.org/ntsb/ANC71DAG83), Apr 10, 1971: Helio H391B (N4123D), Anchorage, AK, substantial 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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