Mailing List lml@lancaironline.net Message #62959
From: Gary Casey <casey.gary@yahoo.com>
Sender: <marv@lancaironline.net>
Subject: Re: Thermal influence on Hydraulic Pressure
Date: Sat, 08 Sep 2012 18:22:17 -0400
To: <lml@lancaironline.net>
I don't know much about the problem, but....I've owned a couple of retractible Cessnas and their approach, as well as Piper's was also to "dead-head" the pressure, in some cases just in the retracted position and in others both the up and down position.  They had a relief valve that I assume would relieve the pressure caused by temperature increases.  That was coupled with a pressure switch that would turn on the pump in case the pressure decayed, either from a temperature drop or from a leak.  A very simple setup and I have never heard of a problem caused by that arrangement.  One difference was that there was no gauge or warning switch that would let the pilot know that the pressure was rising.  Just wondering, that's all...
Gary Casey
gear "down and welded"
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