HAWAII PACIFIC AVIATION INC: http://registry.faa.gov/N74805
NTSB Identification: WPR16LA168
14 CFR Part 91: General Aviation
Accident occurred Friday, August 26, 2016 in Kailua/Kona, HI
Aircraft: ROBINSON R44, registration: N74805
Injuries: 2 Uninjured.
This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
On August 26, 2016, about 0745 Hawaii standard time, a Robinson R44 II helicopter, N74805, was substantially damaged following a loss of control after landing at the Kona International Airport at Keahole (HKO), Kailua/Kona, Hawaii. The two certified flight instructors were not injured. Visual meteorological conditions prevailed during the personal flight, which was being conducted in accordance with 14 Code of Federal Regulations Part 91, and a flight plan was not filed. The local flight departed HKO about 0715.
In a telephone conversation with the National Transportation Safety Board investigator-in-charge, the flight instructor who was acting as pilot-in-command reported that after landing and in the process of bottoming out the collective, the helicopter began to gently oscillate fore and aft about its longitudinal axis. This was followed shortly by the oscillating condition becoming more severe, to the point where one main rotor blade, the tail boom, and the lower vertical fin impacted terrain. The tail boom and lower vertical fin were substantially damaged as the result of the impact with terrain.
The helicopter was secured by the operator pending further investigation.