ASN Wikibase Occurrence # 30537
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| Date: | Tuesday 18 May 1999 |
| Time: | 17:30 LT |
| Type: |  Robinson R22 Alpha |
| Owner/operator: | Helipro, Inc. |
| Registration: | N8558N |
| MSN: | 0466 |
| Total airframe hrs: | 9536 hours |
| Engine model: | Lycoming O-320-B2C |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | 5 miles E of San Luis Obispo, California -
 United States of America
|
| Phase: | Approach |
| Nature: | Training |
| Departure airport: | (KSBP) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The instructor stated the student entered a practice autorotation at 1,400 feet (600 feet agl) to a landing site on top of a hill about 800 feet high. As the flare was initiated at 40 to 50 feet, the instructor mentioned to the student that the cyclic trim was engaged. When the student unexpectedly reached forward and tried to push the trim control knob in, he inadvertently pushed forward on the cyclic control. The instructor said this pitched the nose of the helicopter down and resulted in a bleed off of main rotor rpm. When the low rotor horn and warning light came on the instructor took control of the helicopter and rolled in throttle. The lowest rpm he recalls seeing was slightly above 90 percent. He made a left turn to avoid hitting the hill and encountered a strong downdraft due to the gusty winds. The helicopter touched down on the left skid during the turn and rolled over twice.
Probable Cause: The student's inadvertent and uncoordinated application of forward cyclic during an autorotation flare, which resulted in a loss of main rotor rpm; and the flight instructor's inadequate supervision.
Accident investigation:
 |
|
Sources:
NTSB LAX99LA186
FAA register: NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X18815&key=1
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=8558N
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 19-Dec-2011 14:49 | Dr. John Smith | Updated [Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Departure airport, Source, Damage, Narrative] |
| 23-Sep-2016 18:53 | Dr.John Smith | Updated [Time, Operator, Location, Departure airport, Source, Narrative] |
| 26-Nov-2017 15:14 | ASN Update Bot | Updated [Time, Operator, Departure airport, Source, Damage, Narrative] |
| 08-Apr-2024 06:05 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Source, Narrative, Category, Accident report] |
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