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Date: Thu, 15 Mar 2012 08:34:34 -0400
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From: jeffrey liegner <liegner@ptd.net>
Subject: Re: [LML] Re: hydraulic pressure gauges
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After reviewing the options for tapping into the hydraulics, the plumbing a=
nd the gauge, rather than having a gauge on the panel somewhere, I'm now ac=
tually thinking I will place a transducer off the hydraulic distribution ma=
nifold in the gear well.  Then I would make this an annual option (or perio=
dic option), connecting a display gauge to read the high-low.

I'm thinking that I don't need immediate and continuous monitoring of the p=
ressure.  If the flaps or gear transit time slows, I will know this.  If th=
e pressure is suddenly lost (catastrophic loss of hydraulics), having the g=
auge won't tell me more than what I already know...gear won't go down, flap=
s don't work.  And having another high pressure hose behind the panel invit=
es a new leak. 

Thoughts?

Jeff L


On the IV-P I'm planning to tee a mechanical gauge in the Pressure line goi=
ng to the control valve assembly. That'd show me what's available for use a=
nd there's no need for any external power source.

 That could be in addition to transponders monitoring pressure at other poi=
nts in the system.  -Bill Wade


I just finished installing 2 hydraulic gages.   I was replacing all flex hy=
d lines with new, so it wasn't hard to include a T in the up line and down =
line located under the passenger seat. =A0Made an aluminum add on mini pane=
l that goes between pilot's legs and straddles my flap switch.   Ran 2 four=
 foot lines to back of gages.   All works great on several gear swings, but=
 no operational/environmental experience yet.  

I definitely wanted the gages where I could see them for any diagnosis, and=
 the panel was full of 1000 steam gages already.

Gages are number 9780T221 from McMaster-Carr for a low $21.48 each.   These=
 are liquid filled with silicon (-40 deg F to 158deg F). =A0Entire operatio=
n cost less than $100.

I'll forward a picture in day or so.

Jack Addison   =A0jraddison@msn.com
IO360 high comp
		 	 		

-----Original Message-----
From: jeffrey liegner [mailto:liegner@ptd.net]
Sent: Monday, March 12, 2012 6:56 AM
To: lml@lancaironline.net
Subject: Suggested Pressure Gauge for Hydraulic Monitoring (LIVP)

Any suggestions on which small hydraulic pressure gauge would be a good
choice to display hydraulic pressure, either during preflight (ex, in wheel=

well) or inside the cockpit (for monitoring)?  Analogue or electric display=
?
Best location to T the gauge into the system?

Thanks.

Jeff Liegner
Sparta, NJ