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ASN Wikibase Occurrence # 30258
Last updated: 20 November 2017
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Time:08:30 HST
Type:Silhouette image of generic R22 model; specific model in this crash may look slightly different
Robinson R22 Beta
Owner/operator:Mauna Loa Helicopters
Registration: N62DF
C/n / msn: 1643
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Airplane damage: Written off (damaged beyond repair)
Location:Hana Airport, Hana, Maui, Hawaii -   United States of America
Phase: Approach
Departure airport:Hawi, Hawaii
Destination airport:Hana Airport, Maui, Hawaii (HNM/PHHN)
Investigating agency: NTSB
On January 30, 2000, about 08:30 hours HST (Hawaiian Standard Time), a Robinson R22B Beta, N62DF, operated by Mona Loa Helicopters, Kailua-Kona, Hawaii, experienced an in-flight loss of control on approach for landing. The helicopter touched down hard at the Hana Airport, on the island of Maui. The helicopter was substantially damaged, and the student pilot was seriously injured during the solo instructional flight. Visual meteorological conditions prevailed, and a visual flight rules flight plan was filed. The flight was conducted under the provisions of 14 CFR Part 91, and it originated from Hawi, Hawaii, about 0800.

During landing approach at the completion of a solo cross-country flight, the student pilot was slowing below 30 knots to enter a hover, when the helicopter began spinning to the right. The student was unable to arrest the right yaw and entered an auto-rotation, which terminated in a rotating collision with terrain 137 feet short of the runway.

He was attempting to land with a left crosswind and/or quartering tailwind from a direction and at a speed conducive to a tail rotor vortex ring state condition. The condition results in tail rotor thrust variations, which can require rapid and continuous pedal movements to maintain heading and cause unanticipated right yaw rates to develop.

If the yaw rate is not controlled immediately, the helicopter can rotate into a wind azimuth region where weather cock instability will accelerate the right yaw. This condition will be aggravated at airspeeds below 30 knots when the loss of translational lift results in an increased power demand (more torque) and a corresponding increase in anti-torque requirement.

The student's total flying experience and as pilot-in-command time was about 60.6 and 5.2 hours, respectively.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows: The student's failure to maintain directional control after encountering a tail rotor vortex ring state induced right yaw.


1. NTSB Identification: LAX00LA089 at
2. FAA:

Revision history:

27-Sep-2008 01:00 ASN archive Added
20-Dec-2011 17:11 Dr. John Smith Updated [Time, Total occupants, Total fatalities, Other fatalities, Location, Country, Phase, Nature, Departure airport, Destination airport, Source, Damage, Narrative]
06-Sep-2016 13:39 Dr.John Smith Updated [Location, Destination airport, Source, Narrative]
06-Sep-2016 13:40 Dr.John Smith Updated [Total fatalities]
24-Sep-2016 20:40 Dr.John Smith Updated [Source, Narrative]

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