ASN Wikibase Occurrence # 294455
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| Date: | Saturday 25 September 2004 |
| Time: | 15:49 LT |
| Type: |  Schweizer 269C-1 |
| Owner/operator: | Group 3 Aviation |
| Registration: | N61413 |
| MSN: | 0027 |
| Year of manufacture: | 1996 |
| Total airframe hrs: | 6298 hours |
| Engine model: | Lycoming HO-360-C1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Burbank, California -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Los Angeles-Van Nuys Airport, CA (VNY/KVNY) |
| Hollywood Burbank Airport, CA (BUR/KBUR) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter encountered ground resonance after landing and sustained substantial damage in the vibratory event. The pilot-undergoing-instruction (PUI) was taking refresher training in the helicopter. The approach was normal; however, the touchdown was harder than normal. With the helicopter on the ground, the certified flight instructor (CFI) began discussing the touchdown with the PUI and the helicopter began to vibrate. The CFI did not have time to react prior to the helicopter self-destructing. Post-accident examination of the components found that in the forward landing gear dampers the pistons were fully extended and they contained fluid in excess of the levels specified in the maintenance instructions. Dampers in this condition will not compress or attenuate airframe motion and vibrations or prevent ground resonance. The last inspection on the helicopter was a 100-hour that was completed 4.5 hours prior to the accident flight.
Probable Cause: the failure of maintenance personnel to correctly service the forward landing gear strut dampers in accordance with the manufacturer's maintenance instructions.
Accident investigation:
 |
|
Sources:
NTSB LAX04LA331
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Oct-2022 18:23 | ASN Update Bot | Added |
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