ASN Wikibase Occurrence # 358573
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| Date: | Thursday 27 July 1995 |
| Time: | 23:50 LT |
| Type: |  Schweizer 300C |
| Owner/operator: | Board Of Police Commissioners |
| Registration: | N643KC |
| MSN: | S-1633 |
| Total airframe hrs: | 1547 hours |
| Engine model: | Lycoming HIO-360-D1A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Kansas City, MO -
 United States of America
|
| Phase: | Landing |
| Nature: | Unknown |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that he made a normal, smooth landing. He said the helicopter had been on the ground about 5 to 6 seconds and that he had reduced the engine rpm back between 2700 and 2800 RPM's, when he noticed a vibration in the helicopter. The pilot said he rolled in the throttle to 3100 rpm and attempted to get the helicopter into a hover. He reported that the vibrations were severe, and about one second later, the left skid collapsed and the main rotor contacted the tailboom. He secured and evacuated the helicopter after all motion had stopped. Tests revealed that the charge pressure for all four landing gear dampers was lower than that specified by the maintenance instructions. The maintenance instructions warned that improper shock strut pressure levels may result in ground resonance and destruction of the helicopter. Examination of the main rotor head dampers revealed no evidence of preexisting cracks or fatigue.
Probable Cause: ground resonance as a result of improper servicing of the main landing gear dampers.
Accident investigation:
 |
|
Sources:
NTSB CHI95TA243
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 15:53 | ASN Update Bot | Added |
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