From: BOBPAS26@aol.com
Message-ID: <a1.178dd3b5.2870604e@aol.com>
Date: Sun, 1 Jul 2001 07:15:26 EDT
Subject: Hydraulic Filter for IV-P
To: lancair.list@olsusa.com
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Question--was this filter added to the builds later than my kit No. 53, or is
the filter in the hydraulic pump itself?
 
David Jones

David, The filter is listed as an option in the Lancair Accessories 
Catalogue. It is not included in the current building manual, but many 
builders are installing it. I noted that it did not include a bypass and 
considered fabricating my own--fairly easy to do with a small in-line check 
valve--but anticipated the "failure mode" to be exactly what another builder 
described--slow degradation in performance, and workable. Specifically, 
operation of the gear and flaps will become sluggish as the filter plugs, 
giving me the opportunity to clean it--or at least determine the specific 
cause. I installed fuel filters on each wing feed line just behind the main 
spar web for similar reasons--to catch the small amount of junk that would 
otherwise foul an injector, or in this case--wear out the hydraulic pump 
faster. In spite of the LML post and subsequent recommendation, I still think 
such filters are a good investment. There are several alternatives to improve 
the safety and reliability of filter systems, but throwing away the filter 
element is at the bottom of that list.

Bob Pastusek
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LML website:   http://www.olsusa.com/mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.
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