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Narrative: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 autorotation, which terminated in a rotating collision with terrain 137 feet short of the runway.
Robinson R22 Beta
|Owner/operator:||Mauna Loa Helicopters|
|C/n / msn:|| 1643|
|Fatalities:||Fatalities: 0 / Occupants: 1|
|Airplane damage:|| Written off (damaged beyond repair)|
|Location:||Hana, Maui, Hawaii -
United States of America
|Departure airport:||Hawi, Hawaii|
|Destination airport:||Hana, Maui, Hawaii|
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.
||Dr. John Smith
||Updated [Time, Total occupants, Total fatalities, Other fatalities, Location, Country, Phase, Nature, Departure airport, Destination airport, Source, Damage, Narrative]|
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