ASN Wikibase Occurrence # 385362
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| Date: | Tuesday 10 October 2000 |
| Time: | 08:30 LT |
| Type: |  Enstrom F-28F |
| Owner/operator: | Reeder & Haye Aircraft |
| Registration: | N223RS |
| MSN: | 748 |
| Year of manufacture: | 1987 |
| Total airframe hrs: | 2949 hours |
| Engine model: | Lycoming HIO-360 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Twin Falls, ID -
 United States of America
|
| Phase: | Landing |
| Nature: | Unknown |
| Departure airport: | Twin Falls, ID (KTWF) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that during a maintenance test flight to check controls, collective pitch position, throttle positioning, and rpm correlation control entering an autorotation, he entered the autorotation with low rpm. When the pilot corrected with collective pitch, the correlator over responded, resulting in an rpm overspeed. The pilot closed the throttle and increased the collective, however, the rpm dropped and the pilot had to complete the autorotation to touch down on rough terrain. So as not to have any forward speed at touch down, and fearing that the helicopter might roll over, the pilot anticipated a hard flare to stop the forward speed. Just prior to touch down, the tailrotor contacted the ground, and the tailrotor gearbox separated from the tail boom. The helicopter yawed to the right about 150 degrees before the pilot was able to level the helicopter, arrest the yaw and land without further incident.
Probable Cause: The pilot's failure to maintain adequate rotor rpm. Unsuitable terrain was selected for the maintenance test flight operation.
Accident investigation:
 |
|
Sources:
NTSB SEA01LA003
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Apr-2024 17:47 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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