ASN Wikibase Occurrence # 176573
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| Date: | Tuesday 27 April 2004 |
| Time: | 14:40 |
| Type: |  Schweizer 269C-1 |
| Owner/operator: | Group 3 Aviation |
| Registration: | N61415 |
| MSN: | 18 |
| Total airframe hrs: | 5689 hours |
| Engine model: | Lycoming HO-360-C1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Van Nuys, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Van Nuys, CA (VNY) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter encountered ground resonance during the initial run-up prior to takeoff. During the run-up, the magneto checks produced a rough running engine. At 2,000 rpm the certified flight instructor (CFI) attempted to correct the roughness by leaning the mixture. The helicopter then began shaking from side-to-side, indicating ground resonance. Due to the low rpm, the CFI elected to close the throttle rather than lift the helicopter from the ground. The ground resonance increased and neither the pilot-undergoing-instruction nor the CFI could hold onto the controls. The CFI then pulled the mixture control and the engine stopped. The skid damper assemblies were examined and tested for charge. The rear dampers had a lower charge than that specified in the maintenance manual for the helicopter. The forward dampers were within limits. The Schweizer 269 maintenance instructions call for the dampers to be checked and correctly pressurized at each 100-hour inspection. The last 100-hour inspection was 1 month 61 hours prior to the accident.
Probable Cause: the failure of maintenance personnel to ensure the proper charge of the aft landing gear dampers in accordance with the manufacturer's recommendations.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20040506X00569&key=1
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Jun-2015 18:37 | Noro | Added |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 07-Dec-2017 17:52 | ASN Update Bot | Updated [Cn, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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