ASN Wikibase Occurrence # 280815
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| Date: | Monday 25 July 2022 |
| Time: | 08:45 LT |
| Type: |  Robinson R44 Raven II |
| Owner/operator: | Southern Utah University |
| Registration: | N497SU |
| MSN: | 11441 |
| Year of manufacture: | 2006 |
| Total airframe hrs: | 5286 hours |
| Engine model: | Lycoming IO-540-AE1A5 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Cedar City Regional Airport (CDC/KCDC), UT -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Cedar City Airport, UT (CDC/KCDC) |
| Cedar City Airport, UT (CDC/KCDC) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter flight instructor was performing straight-in autorotation with power recovery maneuvers with a student pilot. On the third autorotation, the flight instructor stated that the student started the maneuver at 700 ft above ground level (agl) with the main rotor rpm at 100%. During the glide, when the RPM decayed to 90% and the airspeed decreased to 60 knots, the instructor intervened, and he attempted to recover the lost RPM. About 100 ft agl, the instructor prepared for a roll-on landing. The helicopter subsequently landed hard, rolled over on it's left side and sustained substantial damage when the main rotor blades severed the tailboom. The instructor reported that there were no preimpact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation.
Probable Cause: The student pilot's failure to maintain rotor rpm and airspeed and the flight instructor's inadequate remedial action to regain helicopter control during the straight-in autorotation which resulted in a hard landing.
Accident investigation:
 |
|
Sources:
NTSB WPR22LA267
FAA register: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=497SU
https://flightaware.com/live/flight/N497SU
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-Jul-2022 18:08 | Captain Adam | Added |
| 27-Jul-2022 15:32 | johnwg | Updated [Total occupants, Location, Source, Narrative, Category] |
| 01-Aug-2022 11:17 | Captain Adam | Updated [Time, Location, Narrative] |
Corrections or additions? ... Edit this accident description
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