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Date: Mon, 20 Nov 2006 10:16:16 -0500
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From: randy snarr <randylsnarr@yahoo.com>
Subject: Electrical /Hydraulic system questions lancair 235/320
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I haven't posted in a while as I have been busy flying
and completing my interior.
I will post a few pics when I am completed to keep the
grinding, sanding crowd motivated.

Anyway, I was flying recently near dark and I had the
panel switch lights on. Can someone tell me why my
lights flicker with the alternator on? 

When I turn the alternator off the flicker goes away.
Is this just a bad voltage regulater or something
else?
Ironicly my wifes Lexus suv started doing the same
thing. Maybe it is her fault!

2nd question. I have experienced the same issue as
some have documented regarding the gear not coming
down without recycling the dump valve. I flew on
Friday and noticed something interesting. 

Here are the facts:

Depart from PVU
50 deg f
4500 ft field elev
cruised at 12.5 for 1.2 hrs to a warmer place
decend to 4000 ft 
new atmosphere temp near 65 f

I have gauges on the high and low side of the hyd
system
After take off they idicated low-0 and high-1300 or
so.
After decending to a warmer atmospheric conditions
both  the high and low side of the hydraulic system
had significantly risen. low 400 psi and high 1700
psi.

What happens in my case is the system pressure rises
in cruise on the high and low side. The lower side
exceeds the high pressure switch and the gear does not
come down. I open the dump valve and then close it and
the gear acts normally. 

My question relates the down side witht he gear up.
It would seem to me that that side should always stay
at 0 relieving pressure back to the resevoir in the
pump.

At first I thought I may have a leak somewhere
allowing the pressure to sneak past the high side to
the low side in cruise. I do not believe that is
happening to me as both the high and low sides rise. 

Can someone give me some idea where to start?

Thanks in advance!!!

Randy L. Snarr 
235/320
121 hours and counting since 5-29-06


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