Randy,
Flickering Lights
The voltage regulator is certainly a possibility. How about a loose
connection to your light dimming circuitry or a bad ground there?
What alternator, regulator and battery are you using?
Lo side pressure
It is hard to imagine the low side fluid expanding since there is so little
of it available when everything is sucked up. However, if the stops are,
uh, not rigid, it is conceivable that the up side fluid pressure
rise could push the piston further, maybe thru fluid expansion in the nose
wheel well actuators that are heated by lower cowling air entering the
well during flight. The ambient temperature rise in the main gear
wells doesn't seem high enough to have much of an effect except that it isn't
helping relieve any pressures. Maybe Chris has more useful
information. Luckily your pressures are different enough that the dump
valve relieves the lo side enough to allow the pump to come on.
Scott Krueger
AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)
A man
has got to know his limitations.
In a message dated 11/20/2006 9:16:51 A.M. Central Standard Time,
randylsnarr@yahoo.com writes:
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?