Accident Brantly Helicopter B-2 N4999C, Sunday 8 July 1984

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Date:	Sunday 8 July 1984
Time:	12:10 LT
Type:	Brantly Helicopter B-2
Owner/operator:	Larry Alderson
Registration:	N4999C
MSN:
Total airframe hrs:	564 hours
Engine model:	Lycoming VO-360-A1B
Fatalities:	Fatalities: 0 / Occupants: 2
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Bennington, KS - United States of America
Phase:	Taxi
Nature:	Training
Departure airport:	Bennington, KS
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
THE STUDENT PLT STATED THAT AFTER LIFTING TO A HOVER ON HER FIRST SOLO FLT, SHE MADE TWO 180 DEGREE HOVERING TURNS. SHE SAID THAT THE HELICOPTER ENTERED A VIOLENT LATERAL VIBRATION AND DESCENDED TO THE GROUND. EXAMINATION OF THE WRECKAGE DID NOT DISCLOSE ANY EVIDENCE OF PRE-IMPACT MALFUCTION OR FAILURE THAT WOULD HAVE CONTRIBUTED TO THE ACCIDENT.

Probable Cause:

Accident investigation: