Message-Id: <3.0.3.32.19981106131413.00774bd0@olsusa.com>
Date: Fri, 06 Nov 1998 13:14:13 -0500
To: lancair.list@olsusa.com
From: <dechaze@cardell.com> (by way of Marvin Kaye <marvkaye@olsusa.com>)
Subject: Re:Hydraulic Pressure 
Mime-Version: 1.0

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Angier asks about any concerns with hydraulic pressure bleeding off to zero
over
a week or so...

I don't think there is.   I have my plane on jackstands and had the wheels up
for that amount of time recently.  The pressure started at about 1000 psi and
fairly quickly bled down to 500-600 lbs (few hours).  Next day it was
around 400
psi and none of the wheels had started to fall.  After a week the pressure
indicated 100-200 psi but the gage dial accuracy is anybody's guess (panel
mounted, refurbed gages).  After a week the nose gear had started down (about
2-3 inches measured at the wheel).   I would have taken a long long time
for the
wheels to come down on their own because that is a lot of fluid to be
displaced
through whatever minor leak might exist.  I still have air in the system
too.  

If the pressure holds above the pump cut-in pressure (looks like about 800 psi
on the high pressure circuit) for a 3 hour flight, I'd be quite satisfied.  

Regards,
Ed de Chazal