Accident Hiller UH-12C N54594, Monday 28 November 1994

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Date:	Monday 28 November 1994
Time:	16:40 LT
Type:	Hiller UH-12C
Owner/operator:	Private
Registration:	N54594
MSN:	873
Total airframe hrs:	2939 hours
Engine model:	FRANKLIN 6V-335-B
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Twisp, WA - United States of America
Phase:	Landing
Nature:	Training
Departure airport:	(2S0)
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
WHEN THE STUDENT PILOT APPLIED POWER DURING THE LANDING FLARE OF A PRACTICE AUTO ROTATION THE ENGINE DID NOT RESPOND. HE THEN TRANSITIONED TO A FULL AUTOROTATION BUT WAS LATE APPLYING COLLECTIVE TO FLARE BEFORE TOUCHDOWN AND A MAIN ROTOR BLADE IMPACTED THE TAILBOOM. NO MECHANICAL MALFUNCTION OF THE HELICOPTER'S POWERPLANT WAS DISCOVERED.

Probable Cause: AN UNEXPLAINED LOSS OF POWER AND THE STUDENT PILOT'S DELAYED APPLICATION OF COLLECTIVE DURING THE LANDING FLARE.

Accident investigation: