Accident Hiller UH-12E N1043L, Monday 16 July 1984

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Date:	Monday 16 July 1984
Time:	07:20 LT
Type:	Hiller UH-12E
Owner/operator:	Private
Registration:	N1043L
MSN:	59-2739
Engine model:	Lycoming VO-540-C2A
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Redmond, OR - United States of America
Phase:	Manoeuvring (airshow, firefighting, ag.ops.)
Nature:	Agricultural
Departure airport:
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
THE ACFT COLLIDED WITH THE GROUND AFTER A IN-FLT MAIN ROTOR BLADE SEPARATION DURING AN AERIAL APPLICATION FLT. INSPECTION OF THE FRACTURE SURFACE OF THE FAILED BLADE REVEALED CHARACTERISTICS CONSISTANT WITH THE HIGH STRESS, LOW CYCLE FATIGUE. LAB FINDINGS WILL BE COMPARED WITH SIMILIAR FAILURES WHICH HAVE OCCURRED SUBSEQUENT TO THE EXISTING AIRWORTHINESS DIRECTIVE (AI 80-14-12) REQUIRING SPECIAL INSPECTION OF THE SAME FAILURE AREA.

Probable Cause:

Accident investigation: