ASN Wikibase Occurrence # 249406
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| Date: | Wednesday 22 April 2020 |
| Time: | 17:00 LT |
| Type: |  Robinson R22 |
| Owner/operator: | Silverhawk Aviation Academy |
| Registration: | N6703S |
| MSN: | 3621 |
| Year of manufacture: | 2004 |
| Total airframe hrs: | 7612 hours |
| Engine model: | Lycoming O-360 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Caldwell, Idaho -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Caldwell Industrial Airport, ID (KEUL) |
| Caldwell Industrial Airport, ID (KEUL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight instructor reported that, during the instructional flight and while conducting a maximum-glide configuration autorotation, he and the student pilot set the rotor rpm between about 93% and 94%. The instructor began applying aft cyclic to slow the descent rate and to regain rpm; however, the descent rate did not decrease, so he applied more left cyclic to no avail and then increased the throttle. The helicopter landed hard at the most level attitude the instructor could make it, and it then bounced and came to rest. The tailboom was substantially damaged. The Pilot's Operating Manual contained a caution that stated to "increase rotor RPM to 97% minimum when autorotating below 500 ft above ground level." The chief flight instructor reported that there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation.
Probable Cause: The flight instructor's failure to set the proper rotor rpm during a practice autorotation, which led to his failure to maintain a proper descent rate and resulted in a hard, bounced landing.
Accident investigation:
 |
|
Sources:
NTSB WPR20CA140
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Apr-2021 10:56 | ASN Update Bot | Added |
| 04-Apr-2021 11:06 | harro | Updated [Phase, Departure airport, Destination airport, Narrative] |
Corrections or additions? ... Edit this accident description
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