Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml
Date: Thu, 23 May 2002 16:30:06 -0400
Message-ID: <redirect-1246189@logan.com>
From: "fili" <filidauro@bendcable.com>
References: <list-1245044@logan.com>
Subject: LNC-IV hydraulic pump 'cycles' 
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We have the hydraulic pump on our airplane 'cycle' about every 3-5 =
minutes while on the ground as well as in flight, which means that it =
runs for a second or so every once in a while. We ruled out the =
possibility of air bubbles since the oil has been in the system for =
quite some time, and we had cycled the gears really many times with the =
airplane on its jacks. We knew it was due to an internal leak somewhere =
in the system but did not know where, and certainly knew it would be a =
PITA trying to trouble-shoot that. Then, I recently tried leaving the =
flaps down and noticed that when I turn the master switch back on, the =
hydraulic pump doesn't make a sound. I have had the flaps down for now =
24 hours and the system still holds the pressure.

I am curious to know if anyone else's airplane behaves the same way and =
also if anyone here thinks the gear/flap selector assembly has been =
designed that way, I don't know, maybe it is bad for the system to stay =
pressurised for extend periods of time ?

Thanks, fili

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<DIV><FONT face=3DArial size=3D2>We have the hydraulic pump on our =
airplane 'cycle'=20
about every 3-5 minutes while on the ground as well as in flight, which =
means=20
that it runs for a second or so every once in a while. We ruled out the=20
possibility of air bubbles since the oil has been in the system for =
quite some=20
time, and we had cycled the gears really many times with the airplane on =
its=20
jacks. We knew it was due to an internal leak somewhere in the system =
but did=20
not know where, and certainly knew it would be a PITA trying to =
trouble-shoot=20
that. Then, I recently tried leaving the flaps down and noticed that =
when I turn=20
the master switch back on, the hydraulic pump doesn't make a sound. I =
have had=20
the flaps down for now 24 hours and the system still holds the=20
pressure.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I am curious to know if anyone else's =
airplane=20
behaves the same way and also if anyone here thinks the gear/flap =
selector=20
assembly has been designed that way, I don't know, maybe it is bad for =
the=20
system to stay pressurised for extend periods of time ?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Thanks, fili</FONT><FONT =
face=3Darial,helvetica><FONT=20
size=3D2></DIV></FONT></FONT></BODY></HTML>

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