ASN Wikibase Occurrence # 30258
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| Date: | Sunday 30 January 2000 |
| Time: | 08:30 |
| Type: |  Robinson R22 Beta |
| Owner/operator: | Mona Loa Helicopters |
| Registration: | N62DF |
| MSN: | 1643 |
| Year of manufacture: | 1991 |
| Total airframe hrs: | 1275 hours |
| Engine model: | Lycoming O-320-B2C |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Hana Airport, Maui, HI -
 United States of America
|
| Phase: | Approach |
| Nature: | Training |
| Departure airport: | Upolu, HI (UPP) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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. 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 antitorque requirement. The student's total flying experience and pilot-in-command time was about 60.6 and 5.2 hours, respectively.
Probable Cause: The student's failure to maintain directional control after encountering a tail rotor vortex ring state induced right yaw.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X20400&key=1
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=62DF
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 20-Dec-2011 17:11 | Dr. John Smith | Updated [Time, Total fatalities, Total occupants, 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 occupants] |
| 24-Sep-2016 20:40 | Dr.John Smith | Updated [Source, Narrative] |
| 12-Dec-2017 18:17 | ASN Update Bot | Updated [Time, Operator, Total occupants, Departure airport, Destination airport, Source, Damage, Narrative] |
| 09-Jun-2023 10:14 | Ron Averes | Updated [[Time, Operator, Total occupants, Departure airport, Destination airport, Source, Damage, Narrative]] |
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