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From: Sky2high@aol.com
Full-name: Sky2high
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Date: Mon, 25 Mar 2013 00:19:25 -0400 (EDT)
Subject: Re: [LML] Re: Hydraulic gear pump failure
To: lml@lancaironline.net
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Angier,
 
Not to worry.  If the lights are green, the over centers are  locked and 
the rat trap springs and gas spring will keep them locked.
 
Did you land at any of those airports?  If so, it worked  then.........
 
Considering your last hiccup, one would think a fast-on came off.  Or  the 
pressure switch did not close or the relay wouldn't close or the switch  
didn't work or the motor is kaput. 
 
 Once on the ground, did you re-engage the breakers and note  whether 
anything happened?  If the motor is bad, the "transition" light  would be on.  If 
the transition light did not come on, the relay did not  close.  If the 
relay did not close is has locked up or did not get  power.  If the pressure 
switch was not closed (lo pressure), no power would  get to the relay coils. 
If the switch is bad, no power would get to the pressure  switch.  If the 
switch is good, the relay breaker is bad, etc.
 
A common failure is the intermittent relay going bad because at  sometime 
it was selected for a long period of time and its coil  deteriorated.
 
Of course, then there are all those pesky connections made with  crimped 
connectors.
 
Good luck, let us know.
 
Grayhawk
 
PS Nice handling of the problem whilst flying the airplane.
 
 
In a message dated 3/24/2013 6:10:20 P.M. Central Daylight Time,  
N4ZQ@VERIZON.NET writes:

Today's  2.5hr flight KBVY-EEN-KLEB-KBTV-KSFM-KBVY was normal right up to 
the point  
when I dropped the gear switch as I turned from base to final...nothing  
happened, no transition light, no air noise as the
gear doors open, no pump  sound, nada... So I exit the pattern and climb to 
2500ft while I begin to  contemplate my naval as well as my options.
Pump and relay breakers had not  popped. High pressure indicated 
1400psi/30psi low, normal. So I returned
to  the airport at 2000ft while numerous aircraft were in the pattern at 
1200ft,  pulled pump and relay breakers, lowered the gear switch at 120 and 
opened the  dump valve and high/low psi drop to zero. Left main was first to 
go green,  right rudder resulted in right main green, nose was stubborn until 
85 and with  a tug of up elevator, it went green. With pump and relay 
breakers in, still no  pump, no down pressure. I advised the tower I was coming 
straight to the  runway. All the while, there is this mental image forming of 
a loosening  sphincter muscle and prematurely shortened lifespan. The soon 
to be closed  tower said the gear appeared to be down. Gear lights indicated 
down and  locked, but would they all hold with no down pressure?
In the end, it was  the best squeaker landing yet, if I do say so myself. 
:-)

So tomorrow  brings the post mortem analysis. 

Angier Ames
N4ZQ
18hrs  
--
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<DIV>Angier,</DIV>
<DIV>&nbsp;</DIV>
<DIV>Not to worry. &nbsp;If the lights&nbsp;are green, the over centers are=
=20
locked and the rat trap springs and gas spring will keep them locked.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Did you land at any of those airports?&nbsp; If so, it worked=20
then.........</DIV>
<DIV>&nbsp;</DIV>
<DIV>Considering your last hiccup, one would think a fast-on came off.&nbsp=
; Or=20
the pressure switch did not close or the relay wouldn't close or the switch=
=20
didn't work or the motor is kaput.&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;Once on the ground, did&nbsp;you re-engage the breakers and note=
=20
whether anything happened?&nbsp; If the motor is bad, the "transition" ligh=
t=20
would be on.&nbsp; If the transition light did not come on, the relay did n=
ot=20
close.&nbsp; If the relay did not close is has locked up or did not get=20
power.&nbsp; If the pressure switch was not closed (lo pressure), no power =
would=20
get to the relay coils. If the switch is bad, no power would get to the pre=
ssure=20
switch.&nbsp; If the switch is good, the relay breaker is bad, etc.</DIV>
<DIV>&nbsp;</DIV>
<DIV>A common failure is the intermittent&nbsp;relay going bad because at=
=20
sometime it was selected for a long period of time and its coil=20
deteriorated.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Of course, then there are all those pesky connections made&nbsp;with=
=20
crimped&nbsp;connectors.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Good luck, let us know.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Grayhawk</DIV>
<DIV>&nbsp;</DIV>
<DIV>PS Nice handling of the problem whilst flying the airplane.</DIV>
<DIV>&nbsp;</DIV>
<DIV>
<DIV>In a message dated 3/24/2013 6:10:20 P.M. Central Daylight Time,=20
N4ZQ@VERIZON.NET writes:</DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px">=
<FONT=20
  style=3D"BACKGROUND-COLOR: transparent" color=3D#000000 size=3D2 face=3DA=
rial>Today's=20
  2.5hr flight KBVY-EEN-KLEB-KBTV-KSFM-KBVY was normal right up to the poin=
t=20
  <BR>when I dropped the gear switch as I turned from base to final...nothi=
ng=20
  happened, no transition light, no air noise as the<BR>gear doors open, no=
 pump=20
  sound, nada... So I exit the pattern and climb to 2500ft while I begin to=
=20
  contemplate my naval as well as my options.<BR>Pump and relay breakers ha=
d not=20
  popped. High pressure indicated 1400psi/30psi low, normal. So I returned<=
BR>to=20
  the airport at 2000ft while numerous aircraft were in the pattern at 1200=
ft,=20
  pulled pump and relay breakers, lowered the gear switch at 120 and opened=
 the=20
  dump valve and high/low psi drop to zero. Left main was first to go green=
,=20
  right rudder resulted in right main green, nose was stubborn until 85 and=
 with=20
  a tug of up elevator, it went green. With pump and relay breakers in, sti=
ll no=20
  pump, no down pressure. I advised the tower I was coming straight to the=
=20
  runway. All the while, there is this mental image forming of a loosening=
=20
  sphincter muscle and prematurely shortened lifespan. The soon to be close=
d=20
  tower said the gear appeared to be down. Gear lights indicated down and=
=20
  locked, but would they all hold with no down pressure?<BR>In the end, it =
was=20
  the best squeaker landing yet, if I do say so myself. :-)<BR><BR>So tomor=
row=20
  brings the post mortem analysis. <BR><BR>Angier Ames<BR>N4ZQ<BR>18hrs=20
  <BR>--<BR>For archives and unsub=20
  http://mail.lancaironline.net:81/lists/lml/List.html</FONT></BLOCKQUOTE><=
/DIV></FONT></BODY></HTML>
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