# NTSB UNK64X3955: Hiller UH12B, N5311V, Ontario, CA, September 13, 1964

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: September 13, 1964
- Place: Ontario, CA · ONTARIO, CA
- Location: 34.0633° N, 117.6509° W: Placed by OpenAirDocs: center of Ontario, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=34.0633&lon=-117.6509&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report January 22, 1964
- Report: Brief approved by the director
- NTSB case key (mKey): 181769
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=UNK64X3955
- Page: https://openairdocs.org/ntsb/UNK64X3955

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
2-0747  64/9/13    ONTARIO CALIF       HILLER UH12B        CR-  0  0  2  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1605                    N5311V              PX-  0  0  0  DUAL                      AGE 44, 2500 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            210 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - ONTARIO INTL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: CONTROLLED                  IN FLIGHT: POWER-ON DESCENT
        PROBABLE CAUSE(S)
           DUAL STUDENT - MISJUDGED ALTITUDE AND CLEARANCE
           PILOT IN COMMAND - INADEQUATE SUPERVISION OF FLIGHT
        EMERGENCY CIRCUMSTANCES - FORCED LANDING ON AIRPORT/SEAPLANE BASE/HELIPT.
                                  DIRECTIONAL CONTROL PROBLEM
```

## Aircraft

- Registration: [N5311V](https://openairdocs.org/aircraft/N5311V), registered now, S/N 703, built 1955 (OpenAirDocs)
- Reported make and model: HILLER UH12B
- Registry model: [Hiller UH-12B](https://openairdocs.org/model/hiller-uh-12b) (registry code 4360110) (OpenAirDocs)
- Registry engine: [Franklin 6V4 series](https://openairdocs.org/engine/franklin-6v4-series) (registry code 27033, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Ontario Intl

## Other investigations on N5311V (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 LAX05LA112](https://openairdocs.org/ntsb/LAX05LA112), Mar 12, 2005: Hiller UH-12B (N5311V), Thermal, CA, substantial damage. Probable cause: the pilot's inadequate in-flight planning and failure to refuel the helicopter, which resulted in fuel exhaustion.

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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