ASN Wikibase Occurrence # 311726
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| Date: | Tuesday 15 September 2020 |
| Time: | 17:53 LT |
| Type: |  Bell 407 |
| Owner/operator: | Dea |
| Registration: | N489DM |
| MSN: | 53619 |
| Year of manufacture: | 2004 |
| Total airframe hrs: | 4775 hours |
| Engine model: | Rolls Royce 250-C47B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Fort Worth, Texas -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Fort Worth Alliance Airport, TX (AFW/KAFW) |
| Fort Worth, TX | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During a routine training flight, the helicopter was in the traffic pattern practicing power recovery auto-rotations, with the pilot under training at the flight controls. During the 5th practice auto-rotation, the flight instructor reduced the throttle, and the helicopter began a normal descent. During the deceleration flare, about 75 ft above ground level, the flight instructor heard the low rotor RPM audio tone. Using a positive transfer of control, the flight instructor quickly took the flight controls. He increased the throttle to what he believed to be the 'FLYâ position. The helicopter settled onto a taxiway. The main rotor blades severed the vertical fins on the horizontal stabilizer, and the tail rotor driveshaft was severed. The operator reported that the pilot did not rapidly roll the throttle to the 'FLYâ position during the deceleration/flare, and the helicopter contacted the ground at less than 100% rotor RPM. The operator stated that there were no mechanical anomalies with the helicopter that would have precluded normal operations.
Probable Cause: The flight instructor's delay in rolling the throttle to the fly position during a practice autorotation maneuver that resulted in a hard landing.
Accident investigation:
 |
|
Sources:
NTSB CEN20CA395
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-May-2023 13:12 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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