NTSB Identification: LAX04LA331.
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Accident occurred Saturday, September 25, 2004 in Burbank, CA
Probable Cause Approval Date: 12/20/2005
Aircraft: Schweizer 269C-1, registration: N61413
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

the failure of maintenance personnel to correctly service the forward landing gear strut dampers in accordance with the manufacturer's maintenance instructions.

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