ASN Wikibase Occurrence # 359254
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| Date: | Sunday 12 March 1995 |
| Time: | 10:45 LT |
| Type: |  Robinson R-22 |
| Owner/operator: | Hillsboro Helicopters, Inc. |
| Registration: | N721HH |
| MSN: | 1484 |
| Year of manufacture: | 1990 |
| Engine model: | LYCOMING O-320 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Hillsboro, OR -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE DUAL STUDENT PILOT AND FLIGHT INSTRUCTOR WERE PRACTICING HOVER AUTOROTATIONS ONTO THE GRASS. IMMEDIATELY PRIOR TO THE ACCIDENT, DIRECTIONAL CONTROL OF THE HELICOPTER WAS LOST WHILE THE DUAL STUDENT WAS RECEIVING INSTRUCTION ON AUTOROTATING TO LANDING FROM A HOVER ABOUT TWO FEET ABOVE THE GROUND. BOTH THE STUDENT AND INSTRUCTOR WERE ON THE CONTROLS AT THE TIME. THE HELICOPTER BEGAN TO DRIFT TO THE LEFT, AND THE FLIGHT INSTRUCTOR USED FULL RIGHT CYCLIC TO CORRECT FOR THE DRIFT. THE HELICOPTER'S LEFT LANDING SKID STRUCK THE GROUND 'HARD' AND THE HELICOPTER ROLLED OVER, CAUSING SUBSTANTIAL DAMAGE. THE WIND WAS BLOWING FROM THE SOUTH AT 15 KNOTS.
Probable Cause: THE DUAL STUDENT PILOT'S FAILURE TO MAINTAIN DIRECTIONAL CONTROL OF THE HELICOPTER DURING THE PRACTICE HOVER AUTOROTATION TO LANDING, AND THE FLIGHT INSTRUCTOR'S FAILURE TO ADEQUATELY SUPERVISE THE DUAL STUDENT DURING THE LANDING. CONTRIBUTING TO THE ACCIDENT WAS AN UNFAVORABLE WIND.
Accident investigation:
 |
|
Sources:
NTSB SEA95LA065
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Mar-2024 08:36 | ASN Update Bot | Added |
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