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Date: Wed, 02 Feb 2005 09:25:48 -0500
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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: Buzzing noise-Lancair 320
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You may recall I reported a buzzing noise from the front of the aircraft
some time back. Various causes were suggested (prop balancing, loose cowls,
loose exhaust extension, worn/incorrect engine mounts).&nbsp;We eventually
tracked it to the nose gear door opening in flight and/or failing to close
after gear retraction. To further confuse the issue, this couldn't be
reproduced on the ground, therefore airload was a factor.<BR><BR>The
solution came in stages, replacing the main and nose gear actuators helped
but didn't solve the problem. Replacing the nose gear door sequence valve
also helped. Finally, replacing the nose gear door cylinder appears to have
completely cured the fault.<BR><BR>Thanks to everyone for their feedback and
faultfinding tips.<BR><BR>An interesting fact also came to light. Replacing
the seals does not always fix an internal leak as excessive wear (the
aircraft has 1000 hours) cannot be compensated for by a standard seal. In
the case of the main and nose gear door, the hydraulic&nbsp;fluid simply
leaked around it thus throwing us a red herring when the gear door still
failed to close.&nbsp;The cylinders themselves may eventually require
replacement.<BR><BR>Thought you guys&nbsp;might like the
feedback<BR><BR>Regards,<BR><BR>--<BR>Gerard O Connell<BR>Melbourne,
Australia<BR>VH-LPD (LNC2)<BR><BR><BR />
<BR
/>
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