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Subject: Re: [LML] Fw: Gear Down...INOP
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Chris,

Why don't we just agree to disagree. I believe in redundancy and it =
looks like you don't.=20

The pressure pulse you're talking about will subside (glad you agree) =
and as it does, because the cylinder is only partially extended, the =
cylinder will continues to extend, the low switch will close again, and =
enable the pump to continue . . . No, the damage has NOT been done.

The only way the switch will stay open (the pressure stays high) is if =
there is a physical obstruction preventing the from moving down any =
further (like when it is full down).

Learn to live with the fact that you're not the only one that knows a =
thing or two about airplanes.

Wolfgang

  ----- Original Message -----=20
  From: Chris Zavatson=20
  To: lml@lancaironline.net=20
  Sent: Thursday, April 24, 2014 8:18 AM
  Subject: Re: [LML] Fw: Gear Down...INOP


  Wolfgang,
  Based on your statement, I don=E2=80=99t think you understand this =
failure mode.
  =E2=80=9C. . but once the pulse subsides (miliseconds) that event is =
over because the un-extended gear down cylinder volume will absorb that =
pulse.=E2=80=9D
  Yes, the pulse event is over, but the damage is done.  The gear is =
stuck partially extended with one pressure switch open and one closed.  =
Your module WILL NOT clear this problem.
  We have very different approaches to aircraft operation and =
maintenance.  I don=E2=80=99t install gadgets to undo a problem after it =
occurs.  I prevent the problem from occurring in the first place.
  =E2=80=9CThis solution does not rely on the pump behaving as it should =
=E2=80=9C   You should not be flying if your pump or any other part of =
the aircraft is not behaving as it should.  Too many have died doing =
this. =20
  Chris Zavatson
  N91CZ
  360std
  www.N91CZ.net
  On Wednesday, April 23, 2014 3:04 PM, Wolfgang <Wolfgang@MiCom.net> =
wrote:

  The dump valves in the 360/320 did not "dump" to the reservoir, it =
only cross connected the high and low sides of the hydraulic pump. But =
you know that.
  Changing it out for a valve the that does "dump" to the reservoir was =
one of my suggestions quite a while back since the pump body already has =
ports to accommodate that.

  Again, forced running of the pump in the appropriate direction =
(determined by the gear switch position) when both hi and lo pressure =
switches have been tripped rendering the pump inoperable, WILL clear the =
problem. That's what a pressure switch monitoring module does, =
automatically. This solution works for the 320, 360 and Legacy.

  This solution does not rely on the pump behaving as it should for the =
service life of the pump. I like more than one way of preventing =
potential hull damage.

  This solution can also be implemented by a manual push button switch =
on the panel but requires pilot intervention.

  "if condition are just right, shut the pump down"=20
  . . . but once the pulse subsides (miliseconds) that event is over =
because the un-extended gear down cylinder volume will absorb that =
pulse.
  . . . unless there is a blockage in the lines . . . then you have =
other problems.
  There is no need to theorize the problem into obscurity. KISS =
principal rules.

  Wolfgang

  ----- Original Message -----=20
  From: Chris Zavatson=20
  To: lml@lancaironline.net=20
  Sent: Tuesday, April 22, 2014 7:59 AM
  Subject: Gear Down...INOP


  Hitting the dump valve may or may not help the problem.
  It depends on how much of a temperature increase you incurred.
  Wolfgang


  =
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
  Wolfgang,
  I suggest a review of the Legacy hydraulic system schematic in the =
following document (Legacy Addendum).
  http://www.n91cz.net/Hydraulics/Lancair%20Hydraulics.pdf
  You will see that the Legacy has a three-way dump valve that connects =
both high and low sides to the reservoir.  It will always dump pressure =
regardless of temperature rise.

  Extension failures were more common in the 320/360 and can be resolved =
by simply adjusting the low side pressure switch higher (and if needed, =
the relief valve also) -see page 10.  The higher volume gear pump in the =
Legacies reduces the exposure to the failure when using stock pressure =
settings.
  The initial extension sends a pressure pulse through the system and =
can, if condition are just right, shut the pump down.  The hydraulic =
system will think the gear is down and pressurized.  This type of =
failure is what caught Lorn off-guard and resulted in a gear-up landing. =
See attached, the photo of Lorn=EF=BF=BDs pressure gauges after he slid =
to a stop.  Both gauges are 500 psi +/-.
  The gear selector is down, the low side pressure switch is open and =
the high side pressure switch is closed.  The very same condition as =
when the gear is fully down and locked.  Based on prior descriptions of =
your module, it will not detect this condition as a failure and will do =
nothing to fix it.
  Most Legacy pumps have spool return springs which can cause pressure =
rise in both sides due to a temperature increase.  This is more often an =
issue sitting on the ground on a hot parking ramp where the potential =
temperature swing is much greater.  I recommend removing these springs =
per instructions in this link:
  http://www.n91cz.com/Hydraulics/Pump-Unlock.pdf


  Chris Zavatson
  N91CZ
  360std
  www.N91CZ.net



  --
  For archives and unsub =
http://mail.lancaironline.net:81/lists/lml/List.html



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<META content=3D"text/html; charset=3Dutf-8" http-equiv=3DContent-Type>
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<DIV><FONT size=3D2 face=3DArial>Chris,</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Why don't we just agree to disagree. I =
believe in=20
redundancy and it looks like you don't. </FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>The pressure pulse you're talking about =
will=20
subside (glad you agree) and as it does, because the cylinder is only =
partially=20
extended,&nbsp;the cylinder will continues to extend, the low switch =
will close=20
again, and enable the pump to continue </FONT><FONT size=3D2 =
face=3DArial>. . . No,=20
the damage has&nbsp;NOT been done.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>The only way the switch will stay open =
(the=20
pressure stays high) is if there is a physical obstruction preventing =
the from=20
moving down any further (like when it is full down).</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Learn to live with the fact that you're =
not the=20
only one that knows a thing or two about airplanes.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Wolfgang</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
  <A title=3Dchris_zavatson@yahoo.com =
href=3D"mailto:chris_zavatson@yahoo.com">Chris=20
  Zavatson</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dlml@lancaironline.net=20
  href=3D"mailto:lml@lancaironline.net">lml@lancaironline.net</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, April 24, 2014 =
8:18=20
  AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [LML] Fw: Gear=20
  Down...INOP</DIV>
  <DIV><BR></DIV>
  <DIV=20
  style=3D"BACKGROUND-COLOR: #fff; FONT-FAMILY: times new roman, new =
york, times, serif; COLOR: #000; FONT-SIZE: 14pt">
  <DIV><FONT size=3D4></FONT></DIV><SPAN>
  <DIV><FONT size=3D4></FONT></DIV>
  <DIV style=3D"MARGIN: 0in 0in 8pt"><FONT size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif">Wolfgang,</FONT></DIV>
  <DIV><FONT size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif"></FONT></DIV>
  <DIV style=3D"MARGIN: 0in 0in 8pt"><FONT size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif">Based=20
  on your statement, I don=E2=80=99t think you understand this failure=20
mode.</FONT></DIV>
  <DIV><FONT size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif"></FONT></DIV>
  <DIV style=3D"MARGIN: 0in 0in 8pt"><FONT size=3D+0><FONT=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif"><FONT=20
  size=3D4><FONT size=3D+0>=E2=80=9C</FONT><SPAN style=3D"LINE-HEIGHT: =
107%">. . but once the=20
  pulse subsides (miliseconds) that event is over because the =
un-extended gear=20
  down cylinder volume will absorb that=20
pulse.=E2=80=9D</SPAN></FONT></FONT></FONT></DIV>
  <DIV><FONT size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif"></FONT></DIV>
  <DIV style=3D"MARGIN: 0in 0in 8pt"><SPAN style=3D"LINE-HEIGHT: =
107%"><FONT size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif">Yes,=20
  the pulse event is over, but the damage is done.<SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>The gear is stuck partially =
extended=20
  with one pressure switch open and one closed.<SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>Your module WILL NOT clear =
this=20
  problem.</FONT></SPAN></DIV>
  <DIV><FONT size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif"></FONT></DIV>
  <DIV style=3D"MARGIN: 0in 0in 8pt"><SPAN style=3D"LINE-HEIGHT: =
107%"><FONT size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif">We=20
  have very different approaches to aircraft operation and =
maintenance.<SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>I don=E2=80=99t install =
gadgets to undo a=20
  problem after it occurs.<SPAN style=3D"mso-spacerun: yes">&nbsp; =
</SPAN>I=20
  prevent the problem from occurring in the first =
place.</FONT></SPAN></DIV>
  <DIV><FONT size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif"></FONT></DIV>
  <DIV style=3D"MARGIN: 0in 0in 8pt"><SPAN style=3D"LINE-HEIGHT: =
107%"><FONT=20
  size=3D+0><FONT=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif"><FONT=20
  size=3D4>=E2=80=9CThis solution does not rely on the pump behaving as =
it should =E2=80=9C<SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN><SPAN=20
  style=3D"mso-spacerun: yes">&nbsp;</SPAN>You should not be flying if =
your pump=20
  or any other part of the aircraft is not behaving as it should.<SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>Too many have died doing =
this.<SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; =
</SPAN></FONT></FONT></FONT></SPAN></DIV>
  <DIV=20
  style=3D"BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: =
0in 0in 8pt; COLOR: rgb(0,0,0)"><SPAN=20
  style=3D"LINE-HEIGHT: 107%"><SPAN style=3D"mso-spacerun: yes"><FONT =
size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif">Chris=20
  Zavatson</FONT></SPAN></SPAN></DIV>
  <DIV=20
  style=3D"BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: =
0in 0in 8pt; COLOR: rgb(0,0,0)"><SPAN=20
  style=3D"LINE-HEIGHT: 107%"><SPAN style=3D"mso-spacerun: yes"><FONT =
size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif">N91CZ</FONT></SPAN></SPAN></DIV>
  <DIV=20
  style=3D"BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: =
0in 0in 8pt; COLOR: rgb(0,0,0)"><SPAN=20
  style=3D"LINE-HEIGHT: 107%"><SPAN style=3D"mso-spacerun: yes"><FONT =
size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif">360std</FONT></SPAN></SPAN></DIV>
  <DIV=20
  style=3D"BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: =
0in 0in 8pt; COLOR: rgb(0,0,0)"><SPAN=20
  style=3D"LINE-HEIGHT: 107%; FONT-FAMILY: 'Arial','sans-serif'"><SPAN=20
  style=3D"mso-spacerun: yes"><FONT size=3D4=20
  face=3D"HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida =
Grande, sans-serif">www.N91CZ.net</FONT></SPAN></SPAN></DIV>
  <DIV><FONT size=3D4></FONT></DIV></SPAN>
  <DIV><FONT size=3D4></FONT></DIV>
  <DIV style=3D"DISPLAY: block" class=3Dyahoo_quoted><FONT =
size=3D4></FONT>
  <DIV style=3D"FONT-FAMILY: times new roman, new york, times, =
serif"><FONT=20
  size=3D4></FONT>
  <DIV=20
  style=3D"FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, =
Lucida Grande, sans-serif"><FONT=20
  size=3D4></FONT>
  <DIV dir=3Dltr><FONT size=3D4></FONT><FONT size=3D4><FONT =
face=3DArial>On Wednesday,=20
  April 23, 2014 3:04 PM, Wolfgang &lt;Wolfgang@MiCom.net&gt;=20
  wrote:<BR></FONT></FONT></DIV><FONT size=3D4></FONT>
  <DIV>
  <DIV id=3Dyiv6800815488><FONT size=3D4></FONT>
  <STYLE></STYLE>
  <FONT size=3D4></FONT>
  <DIV><FONT size=3D4></FONT>
  <DIV><FONT size=3D4 face=3DArial>The dump valves in the 360/320 did =
not "dump" to=20
  the reservoir, it only cross connected the high and low sides of the =
hydraulic=20
  pump. But you know that.</FONT></DIV><FONT size=3D4></FONT>
  <DIV><FONT size=3D4 face=3DArial>Changing it out for a valve the =
that&nbsp;does=20
  "dump" to the reservoir was one of my suggestions quite a while back =
since the=20
  pump body already has ports to accommodate that.</FONT></DIV><FONT=20
  size=3D4></FONT>
  <DIV><FONT face=3DArial></FONT><FONT size=3D4></FONT>&nbsp;</DIV><FONT =

  size=3D4></FONT>
  <DIV><FONT size=3D4 face=3DArial>Again, forced running of the pump in =
the=20
  appropriate direction (determined by the gear switch position) when =
both hi=20
  and lo pressure switches have been tripped rendering the pump =
inoperable, WILL=20
  clear the problem. That's what a pressure switch monitoring module =
does,=20
  automatically. This solution works for the 320, 360 and=20
  Legacy.</FONT></DIV><FONT size=3D4></FONT>
  <DIV><FONT face=3DArial></FONT><FONT size=3D4></FONT>&nbsp;</DIV><FONT =

  size=3D4></FONT>
  <DIV><FONT size=3D4 face=3DArial>This solution does not rely on the =
pump behaving=20
  as it should for the service life of the pump. I like more than one =
way of=20
  preventing&nbsp;potential hull damage.</FONT></DIV><FONT =
size=3D4></FONT>
  <DIV><FONT face=3DArial></FONT><FONT size=3D4></FONT>&nbsp;</DIV><FONT =

  size=3D4></FONT>
  <DIV><FONT size=3D4 face=3DArial>This solution can also be implemented =
by a manual=20
  push button switch on the panel but requires pilot=20
  intervention.</FONT></DIV><FONT size=3D4></FONT>
  <DIV><FONT face=3DArial></FONT><FONT size=3D4></FONT>&nbsp;</DIV><FONT =

  size=3D4></FONT>
  <DIV><FONT size=3D4 face=3DArial>"if condition are just right, shut =
the pump down"=20
  </FONT></DIV><FONT size=3D4></FONT>
  <DIV><FONT size=3D4 face=3DArial>. . . but once the pulse subsides =
(miliseconds)=20
  that event is over because the un-extended gear down cylinder volume =
will=20
  absorb that pulse.</FONT></DIV><FONT size=3D4></FONT>
  <DIV><FONT size=3D4 face=3DArial>. . . unless there is a blockage in =
the lines . .=20
  . then you have other problems.</FONT></DIV><FONT size=3D4></FONT>
  <DIV><FONT size=3D4 face=3DArial>There is no need to theorize the =
problem into=20
  obscurity. KISS principal rules.</FONT></DIV><FONT size=3D4></FONT>
  <DIV><FONT face=3DArial></FONT><FONT size=3D4></FONT>&nbsp;</DIV><FONT =

  size=3D4></FONT>
  <DIV><FONT size=3D4 face=3DArial>Wolfgang</FONT></DIV><FONT =
size=3D4></FONT>
  <DIV><FONT face=3DArial></FONT><FONT size=3D4></FONT>&nbsp;</DIV><FONT =

  size=3D4></FONT>
  <DIV=20
  style=3D"LINE-HEIGHT: normal; FONT-VARIANT: normal; FONT-STYLE: =
normal; FONT-FAMILY: arial; FONT-WEIGHT: normal; font-size-adjust: none; =
font-stretch: normal"><FONT=20
  size=3D4>----- Original Message ----- </FONT>
  <DIV style=3D"BACKGROUND: rgb(228,228,228)"><FONT =
size=3D4><B>From:</B> </FONT><A=20
  title=3Dchris_zavatson@yahoo.com =
href=3D"mailto:chris_zavatson@yahoo.com"=20
  rel=3Dnofollow target=3D_blank =
ymailto=3D"mailto:chris_zavatson@yahoo.com"><FONT=20
  size=3D4>Chris Zavatson</FONT></A><FONT size=3D4> </FONT></DIV><FONT=20
size=3D4></FONT>
  <DIV><FONT size=3D4><B>To:</B> </FONT><A title=3Dlml@lancaironline.net =

  href=3D"mailto:lml@lancaironline.net" rel=3Dnofollow target=3D_blank=20
  ymailto=3D"mailto:lml@lancaironline.net"><FONT=20
  size=3D4>lml@lancaironline.net</FONT></A><FONT size=3D4> =
</FONT></DIV><FONT=20
  size=3D4></FONT>
  <DIV><FONT size=3D4><B>Sent:</B> Tuesday, April 22, 2014 7:59=20
  AM</FONT></DIV><FONT size=3D4></FONT>
  <DIV><FONT size=3D4><B>Subject:</B> Gear =
Down...INOP</FONT></DIV></DIV><FONT=20
  size=3D4></FONT>
  <DIV><BR></DIV><FONT size=3D4></FONT>
  <DIV=20
  style=3D"BACKGROUND-COLOR: rgb(255,255,255); FONT-FAMILY: times new =
roman, new york, times, serif; COLOR: rgb(0,0,0)"><FONT=20
  size=3D4></FONT>
  <DIV id=3Dyiv6800815488><FONT size=3D4></FONT>
  <DIV><FONT size=3D4></FONT>
  <DIV=20
  style=3D"BACKGROUND-COLOR: rgb(255,255,255); FONT-FAMILY: times new =
roman, new york, times, serif; COLOR: rgb(0,0,0)"><FONT=20
  size=3D4></FONT>
  <DIV id=3Dyiv6800815488yui_3_13_0_1_1398103513056_4207><FONT =
size=3D4>Hitting the=20
  dump valve may or may not help the problem.<BR>It depends on how much =
of a=20
  temperature increase you incurred.</FONT></DIV><FONT size=3D4></FONT>
  <DIV id=3Dyiv6800815488yui_3_13_0_1_1398103513056_4206><FONT=20
  size=3D4>Wolfgang</FONT></DIV><FONT size=3D4></FONT>
  <DIV id=3Dyiv6800815488yui_3_13_0_9_1398103513056_9><BR></DIV><FONT=20
  size=3D4></FONT>
  <DIV id=3Dyiv6800815488yui_3_13_0_9_1398103513056_10><FONT=20
  =
size=3D4>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</FONT>=
</DIV><FONT=20
  size=3D4></FONT>
  <DIV id=3Dyiv6800815488yui_3_13_0_1_1398103513056_4522><FONT=20
  size=3D4>Wolfgang,<BR>I suggest&nbsp;a review of&nbsp;the Legacy =
hydraulic=20
  system schematic in the following document (Legacy =
Addendum).<BR></FONT><A=20
  id=3Dyiv6800815488yui_3_13_0_1_1398103513056_4219=20
  href=3D"http://www.n91cz.net/Hydraulics/Lancair%20Hydraulics.pdf" =
rel=3Dnofollow=20
  target=3D_blank><FONT=20
  =
size=3D4>http://www.n91cz.net/Hydraulics/Lancair%20Hydraulics.pdf</FONT><=
/A><BR=20
  id=3Dyiv6800815488yui_3_13_0_9_1398103513056_37><FONT size=3D4>You =
will see that=20
  the Legacy has a three-way dump valve that connects both high and low =
sides to=20
  the reservoir.&nbsp; It will always dump pressure regardless of =
temperature=20
  rise.</FONT></DIV><FONT size=3D4></FONT>
  <DIV=20
  style=3D"BACKGROUND-COLOR: transparent; FONT-STYLE: normal; =
FONT-FAMILY: times new roman, new york, times, serif; COLOR: rgb(0,0,0)" =

  id=3Dyiv6800815488yui_3_13_0_9_1398103513056_36><BR><FONT =
size=3D4>Extension=20
  failures were more common in the 320/360 and&nbsp;can be resolved by =
simply=20
  adjusting the low side pressure switch higher (and if needed, the =
relief valve=20
  also) -see page 10.&nbsp; The higher volume gear pump in the Legacies =
reduces=20
  the exposure to the failure when using stock pressure settings.<BR=20
  id=3Dyiv6800815488yui_3_13_0_9_1398103513056_34>The initial extension =
sends a=20
  pressure pulse through the system and can, if condition are just =
right, shut=20
  the pump down.&nbsp; The hydraulic system will think the gear is down =
and=20
  pressurized.&nbsp; This type of failure is what caught Lorn off-guard =
and=20
  resulted in a gear-up landing. See attached, the photo of =
Lorn=EF=BF=BDs pressure=20
  gauges after he slid to a stop.&nbsp; Both gauges are 500 psi +/-.<BR=20
  id=3Dyiv6800815488yui_3_13_0_9_1398103513056_18>The gear selector is =
down, the=20
  low side pressure switch is open and&nbsp;the high side pressure =
switch is=20
  closed.&nbsp; The very same condition as when the gear is fully down =
and=20
  locked.&nbsp; Based on prior descriptions of your module, it will not =
detect=20
  this condition as a failure and will do nothing to fix =
it.</FONT></DIV><FONT=20
  size=3D4></FONT>
  <DIV=20
  style=3D"BACKGROUND-COLOR: transparent; FONT-STYLE: normal; =
FONT-FAMILY: times new roman, new york, times, serif; COLOR: rgb(0,0,0)" =

  id=3Dyiv6800815488yui_3_13_0_9_1398103513056_39><FONT size=3D4>Most =
Legacy pumps=20
  have spool return springs which can cause pressure rise in both sides =
due to a=20
  temperature increase.&nbsp; This is more&nbsp;often an issue sitting =
on the=20
  ground on a hot parking ramp&nbsp;where the potential temperature =
swing is=20
  much greater.&nbsp; I recommend removing these springs per =
instructions in=20
  this link:</FONT></DIV><FONT size=3D4></FONT>
  <DIV=20
  style=3D"BACKGROUND-COLOR: transparent; FONT-STYLE: normal; =
FONT-FAMILY: times new roman, new york, times, serif; COLOR: =
rgb(0,0,0)"><A=20
  href=3D"http://www.n91cz.com/Hydraulics/Pump-Unlock.pdf" =
rel=3Dnofollow=20
  target=3D_blank><FONT=20
  =
size=3D4>http://www.n91cz.com/Hydraulics/Pump-Unlock.pdf</FONT></A></DIV>=
<FONT=20
  size=3D4></FONT>
  <DIV=20
  style=3D"BACKGROUND-COLOR: transparent; FONT-STYLE: normal; =
FONT-FAMILY: times new roman, new york, times, serif; COLOR: rgb(0,0,0)" =

  id=3Dyiv6800815488yui_3_13_0_9_1398103513056_31><BR></DIV><FONT =
size=3D4></FONT>
  <DIV=20
  style=3D"BACKGROUND-COLOR: transparent; FONT-STYLE: normal; =
FONT-FAMILY: times new roman, new york, times, serif; COLOR: rgb(0,0,0)" =

  id=3Dyiv6800815488yui_3_13_0_9_1398103513056_23><FONT size=3D4>Chris=20
  Zavatson</FONT></DIV><FONT size=3D4></FONT>
  <DIV=20
  style=3D"BACKGROUND-COLOR: transparent; FONT-STYLE: normal; =
FONT-FAMILY: times new roman, new york, times, serif; COLOR: rgb(0,0,0)" =

  id=3Dyiv6800815488yui_3_13_0_9_1398103513056_26><FONT=20
  size=3D4>N91CZ</FONT></DIV><FONT size=3D4></FONT>
  <DIV=20
  style=3D"BACKGROUND-COLOR: transparent; FONT-STYLE: normal; =
FONT-FAMILY: times new roman, new york, times, serif; COLOR: rgb(0,0,0)" =

  id=3Dyiv6800815488yui_3_13_0_9_1398103513056_29><FONT=20
  size=3D4>360std</FONT></DIV><FONT size=3D4></FONT>
  <DIV=20
  style=3D"BACKGROUND-COLOR: transparent; FONT-STYLE: normal; =
FONT-FAMILY: times new roman, new york, times, serif; COLOR: rgb(0,0,0)" =

  id=3Dyiv6800815488yui_3_13_0_9_1398103513056_28><FONT=20
  size=3D4>www.N91CZ.net<BR><BR=20
  =
id=3Dyiv6800815488yui_3_13_0_9_1398103513056_4></FONT></DIV></DIV></DIV><=
/DIV></DIV></DIV></DIV><BR><FONT=20
  size=3D4>--<BR>For archives and unsub </FONT><A=20
  href=3D"http://mail.lancaironline.net:81/lists/lml/List.html"=20
  target=3D_blank><FONT=20
  =
size=3D4>http://mail.lancaironline.net:81/lists/lml/List.html</FONT></A><=
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