NTSB Identification: CHI97IA122.
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Incident occurred Monday, April 28, 1997 in SPOKANE, WA
Probable Cause Approval Date: 11/10/1998
Aircraft: Beech 35, registration: N2839V
Injuries: 1 Uninjured.

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

The pilot reported that he was conducting a maintenance test flight. He was flying straight and level at 160 mph. The sky was 6,500 feet broken with smooth air. The pilot reported that the airplane started to vibrate. He reported that the vibration started as a minor shake and intensified 'like an earthquake.' The pilot pulled the throttle immediately (less than 3 seconds) and the vibration stopped. An uneventful landing was made. The inspection to the airplane revealed no visible damage. The pilot reported that the vibration was the same kind of vibration that he experienced in the same airplane on August 1, 1996. The only changes made to the airplane since the first vibration had been the installation of a B35 model bulkhead, and the installation of F35 model equivalent counterweights. The airplane exhibited no anomalies. The ruddervators were properly balanced.

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

the vibration of the fuselage was due to flutter.

Full narrative available

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