ASN Wikibase Occurrence # 239196
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| Date: | Thursday 6 August 2020 |
| Time: | 15:15 LT |
| Type: |  Hughes OH-6A |
| Owner/operator: | St Louis Co Police |
| Registration: | N911EP |
| MSN: | 591176 |
| Total airframe hrs: | 1229 hours |
| Engine model: | Rolls Royce 250-c20C |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Spirit of St. Louis Airport, Chesterfield, MI -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Saint Louis-Spirit of St. Louis Airport, MO (SUS/KSUS) |
| Saint Louis-Spirit of St. Louis Airport, MO (SUS/KSUS) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The instructor reported that during the instructional flight, he was manipulating the controls and accepted the option to land on the taxiway; he decreased the throttle for a full touchdown auto rotation. About 50 ft above the ground (agl), he flared the helicopter and leveled off about 5 to 10 ft agl. The instructor reported that everything seemed "normal" at this point. He then raised the collective, but the descent was not arrested, so he raised the collective full up. The helicopter landed hard and shook violently. The instructor closed the throttle to which stopped the fuel supply. The tailboom was substantially damaged.
The flight instructor reported that there were no mechanical anomalies with the helicopter that would have precluded normal operation.
The instructor added that he felt a slight tailwind after exiting the helicopter and that the tail wind caused a "vortex ring state" which stalled the main rotor blades.
Probable Cause: The flight instructor's failure to maintain helicopter control which resulted in a hard landing while preforming a practice autorotation.
Accident investigation:
 |
|
Sources:
NTSB CEN20CA326
History of this aircraft
Other occurrences involving this aircraft
| 13 July 1999 | N911EP | St Louis County Police Dept | 0 | Chesterfield, MO | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Aug-2020 06:01 | HeliHub | Added |
| 07-Aug-2020 12:14 | francois | Updated [Source] |
| 07-Aug-2020 13:17 | Aerossurance | Updated [Operator, Location] |
| 16-Sep-2020 08:30 | ASN Update Bot | Updated [Cn, Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative, Accident report] |
| 16-Sep-2020 08:32 | ASN Update Bot | Updated [Source, Narrative] |
| 16-Sep-2020 08:36 | harro | Updated [Nature, Source, Narrative] |
| 25-Mar-2021 19:48 | ASN Update Bot | Updated [Time, Other fatalities, Nature, Source, Narrative, Category, Accident report] |
| 30-May-2023 09:08 | Ron Averes | Updated [[Time, Other fatalities, Nature, Source, Narrative, Category, Accident report]] |
| 31-May-2023 05:23 | Ron Averes | Updated [[[Time, Other fatalities, Nature, Source, Narrative, Category, Accident report]]] |
Corrections or additions? ... Edit this accident description
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