NTSB Identification: LAX87DUJ11.
The docket is stored on NTSB microfiche number 35779.
Accident occurred Tuesday, September 01, 1987 in SCOTTSDALE, AZ
Probable Cause Approval Date: 03/31/1989
Aircraft: HILLER UH-12E, registration: N236HA
Injuries: 1 Minor.

DURING AN AERIAL APPLICATION FLIGHT, THE PLT MADE A TURN-AROUND & WAS STARTING TO MAKE ANOTHER SWATH RUN WHEN HE HEARD A LOUD 'BANG' & THEN THE HELICOPTER COLLIDED WITH TERRAIN. AN INSPN OF THE MAIN ROTOR HEAD & PIN REVEALED THE HUB HAD FAILED FROM HI CYCLE FATIGUE. THE FATIGUE ORIGINATED FROM A POINT IN THE HUB PIN BORE WHERE INTERGRANULAR CORROSION HAD OCCURRED.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ROTOR SYSTEM,MAIN ROTOR HUB..CORRODED

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

ROTOR SYSTEM,MAIN ROTOR HUB..FATIGUE

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