# NTSB LAX68A0067: Hiller UH12L4, N90483, Cucamonga, CA, January 15, 1968

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: January 15, 1968
- Place: Cucamonga, CA · CUCAMONGA, CA
- Location: 34.1422° N, 117.6295° W: Placed by OpenAirDocs: center of Cucamonga, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=34.1422&lon=-117.6295&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious, 2 uninjured
- Status: Completed, report April 25, 1968
- Report: Brief approved by the director
- NTSB case key (mKey): 112023
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX68A0067
- Page: https://openairdocs.org/ntsb/LAX68A0067

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0539  68/1/15    CUCAMONGA,CALIF     HILLER UH12L4       CR-  0  1  0  COMMERCIAL                COMMERCIAL, FL.INSTR.,
        TIME - 1535                    N90483              PX-  0  1  2  AIR TAXI-PASSG            AGE 37, 2364 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            338 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - ONTARIO INTL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: MAIN ROTOR                      TAKEOFF: INITIAL CLIMB
           HARD LANDING                                             LANDING: LEVEL OFF/TOUCHDOWN
        PROBABLE CAUSE(S)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: CLUTCH ASSEMBLY
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
        REMARKS- CLUTCH SLIPPAGE DUE TO WORN AND GLAZED FRICTION SHOES.
```

## Aircraft

- Registration: [N90483](https://openairdocs.org/aircraft/N90483), registered now, S/N 2526, built 1966 (OpenAirDocs)
- Reported make and model: HILLER UH12L4
- Registry model: [Hiller UH-12L4](https://openairdocs.org/model/hiller-uh-12l4) (registry code 4360128) (OpenAirDocs)
- Registry engine: [Lycoming VO-540 series](https://openairdocs.org/engine/lycoming-vo-540-series) (registry code 41534, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Ontario Intl

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.