Aviation Accident Summary LAX87DUJ11

SCOTTSDALE, AZ, USA

Aircraft #1

N236HA

HILLER UH-12E

Analysis

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.

 

Source: NTSB Aviation Accident Database

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