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Date: Mon, 19 Mar 2012 06:17:43 -0400
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From: "Bill Wade" <super_chipmunk@roadrunner.com>
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Subject: Re: [LML] Re: hydraulic pressure gauges
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  Just so, although each Lancair is built according to an individual's 
ideas. In my mind switches on the gear doors are a good way to ensure the 
gear is up. Years ago I patented an indicator system that among other things 
displayed gear up as well as down- nowadays I'm not so sure I'd want lights 
shining all the time.

  Complexity is subjective- there's tradeoffs involved. If you want to fly 
you can't get much simpler than a J-3 Cub. Anything more than that adds 
capability but also additional systems. A hydraulic gauge serves a purpose 
for me but it doesn't have to be for everyone. BTW, I'd use 5052 tubing 
instead of a hose- simpler, lighter, cheaper.  -Bill Wade

-----Original Message----- 
From: John Barrett
Sent: Friday, March 16, 2012 8:13 AM
To: lml@lancaironline.net
Subject: [LML] Re: hydraulic pressure gauges

Most IV's have gear indicators.  Up and Down.  If you don't have one or the
other it would mean the gear is in transit.

John Barrett

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Bill
Wade
Sent: Thursday, March 15, 2012 12:44 PM
To: lml@lancaironline.net
Subject: [LML] Re: hydraulic pressure gauges

  Good point, although in the IV it appears that continuous pressure is
needed to keep the gear up. Not sure how other models are but I'd guess
they're similar. You might get some warning of low pressure from a pump or
pressure switch malfunction if you had switches on the gear doors. Or if
speed started to decay.

Navions have an  engine-driven pump with a controllable pressure/ dump
valve. I'm used to checking the gauge prior to taxi to make sure the system
is up and running. It's not a bad idea to make sure there's pressure even
with over-center links and locking pins.  -Bill Wade

-----Original Message-----
From: jeffrey liegner
Sent: Thursday, March 15, 2012 8:34 AM
To: lml@lancaironline.net
Subject: [LML] Re: hydraulic pressure gauges


After reviewing the options for tapping into the hydraulics, the plumbing
and the gauge, rather than having a gauge on the panel somewhere, I'm now
actually thinking I will place a transducer off the hydraulic distribution
manifold in the gear well.  Then I would make this an annual option (or
periodic option), connecting a display gauge to read the high-low.

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

Thoughts?

Jeff L


On the IV-P I'm planning to tee a mechanical gauge in the Pressure line
going to the control valve assembly. That'd show me what's available for use

and there's no need for any external power source.

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


I just finished installing 2 hydraulic gages.   I was replacing all flex hyd

lines with new, so it wasn't hard to include a T in the up line and down
line located under the passenger seat.  Made an aluminum add on mini panel
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).  Entire operation
cost less than $100.

I'll forward a picture in day or so.

Jack Addison    jraddison@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

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