Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml
Date: Fri, 11 Jul 2003 17:48:30 -0400
Message-ID: <redirect-2472323@logan.com>
Reply-To: "Dan Schaefer" <dfs155@earthlink.net>
From: "Dan Schaefer" <dfs155@earthlink.net>
Subject:  Re: Hydraulics
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Re: Peter Hebert's problem with gear doors closing out of sequence.

Pete, had this same problem years ago on my LNC2 (though it was the nose
gear door giving me grief). The problem was completely cleared up by
carefully working all the air out of the system at the nose gear door
cylinder.

 Air in the lines was bled by partially retracting the gear to pressurize
the "up" circuit (the hydro breaker was pulled for safety to stop the
retract cycle at a point where I could get in the nose well). The AN fitting
on the door cylinder was then slightly cracked followed by manually pushing
the plunger on the hydro switch (sequence is important or else the door
could close when you push the plunger). When the pressure bled off (or when
no more air escaped) the the AN fitting was retightened.

At this point in the retract cycle, the piston in the cylinder should be all
the way to the "door open" position so have very little volume to trap air
in that end, so most of what you bleed should come out of the lines feeding
the cylinder.

This was repeated several times until only hydro fluid came out of the
system when cracked. Very messy, with the red stuff running down my arms and
dripping into my hair, but I've never had another instance of
out-of-sequence door actuation. No theories as to why the air caused a
problem except maybe enough air to actuate the door cylinder can sneak past
the valve where hydro fluid can't. Regardless, it solved my problem.

Hope this helps with your problem.

Dan Schaefer