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From: "Gerard O Connell" <goconnell@dodo.com.au>
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Reply-to: "Gerard O Connell" <goconnell@dodo.com.au>
Subject: UNEXPLAINED VIBRATION-LNC2
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Hi guys, I had an annual inspection just before Christmas and on the
subsequent flight I experienced a very audible change in noise about 5 mins
after take off&nbsp;? engine ? airframe with a slight vibration
through&nbsp;the cockpit. It lasted 20-30 seconds and then stopped as
suddenly as it begun. A visual inspection&nbsp;of the engine revealed
nothing loose and no obvious cause. I know that&nbsp;a plug was changed
during the annual. Could a faulty plug cause this?<BR><BR>The next 4 hours
were uneventful until yesterday when at the end of a 1.5 hour flight the
exact same thing happened. Manifold pressure and RPM were at descent
setting&nbsp;and I observed no drop in RPM with the vibration.<BR><BR>Has
anyone ever experienced this phenomenon?<BR><BR>--<BR>Gerard O
Connell<BR>Melbourne, Australia<BR>VH-LPD (LNC2)<BR>
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