NTSB Identification: SEA85LA079.
The docket is stored on NTSB microfiche number 27968.
Accident occurred Wednesday, March 20, 1985 in ELMA, WA
Aircraft: HUGHES 269C, registration: N9592F
Injuries: 3 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.

JUST PRIOR TO LIFT-OFF A VIBRATION ACCOMPANIED BY LATERAL ROCKING OCCURRED. ALTHOUGH THE PLT BROUGHT THE POWER TO IDLE. THE HELICOPTER HAD ALREADY STARTED TO COME APART. DURING ENGINE EXAMINATION IT WAS FOUND THAT THE GROUND RESONANCE OCCURRED DUE TO UNDER TO RQ WING OF THE MAIN ROTOR DAMPNERS. THE DAMPNERS HAD BEEN SERVICED JUST 1.5 HOURS PRIOR TO THIS ACCIDENT.

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

ROTOR SYSTEM,MAIN ROTOR HUB LEAD-LAG STOP/DAMPER..UNDERTORQUED

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

MAINTENANCE,SERVICE OF AIRCRAFT/EQUIPMENT..INADEQUATE..COMPANY MAINTENANCE PERSONNEL

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