ASN Wikibase Occurrence # 293244
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| Date: | Friday 5 August 2005 |
| Time: | 11:00 LT |
| Type: |  Enstrom 480 |
| Owner/operator: | Andrew Heytow |
| Registration: | N480FX |
| MSN: | 5028 |
| Year of manufacture: | 1997 |
| Total airframe hrs: | 1545 hours |
| Engine model: | Allison 250-C20W |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Goshen, Indiana -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Grand Rapids-Gerald R. Ford International Airport, MI (GRR/KGRR) |
| Goshen Airport, IN (GSH/KGSH) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The certified flight instructor (CFI) stated that the student smoothly lowered the collective and set the helicopter on the ground as he was rolling off the throttle. The helicopter then started to bounce (ground resonance) and the CFI reached down to make sure the collective was down and the throttle was off. The helicopter continued to "shake violently and ripped itself apart." The helicopter had a new design of elastomeric damper installed 91 flight hours before the accident. The new design dampers had been flight tested at the factory and approved by the Federal Aviation Administration prior to being put into service. The helicopter had experienced severe vibrations on two previous flights, one of which resulted in the chin bubble being broken. Inspection of the accident dampers, at the damper manufacturer's factory, determined the dampers were within manufacturer's specifications. After the accident flight the helicopter manufacturer recalled all the new design elastomeric dampers.
Probable Cause: Ground resonance experienced by the pilots.
Accident investigation:
 |
|
Sources:
NTSB CHI05LA218
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Oct-2022 17:48 | ASN Update Bot | Added |
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