----- Original Message -----
Sent: Tuesday, June 16, 2009 7:15
PM
Subject: Re: Continuous running hydraulic
pump
More observation:
If I leave my flap lever in the neutral position, the hydralic reservoir
remains fully pressurized, and next time I fly there's no need for the pump to
come on during power up to recharge the system.
I understand that some planes/pilots must leave their flap lever in the
UP position, or the DOWN position to retain hydralic pressure until the next
flight. If I did this, all pressure would be released. Why the
difference with what is the same valve?
I also have seen the flaps move (briefly) in the opposite direction if
lever is positioned just slightly off of neutral, during routine operations; I
agree that this is a quirk in the internal valve.
Jeff Liegner
LIVP
This is case of
creating a problem that wasn't there. My experience might ease
someone's tension in the future.
While practicing an
approach I got a "check engine" from the Chelton. The indication was
low voltage. I quickly saw the hydraulic pump was running
continuously. I pulled the hydraulic pump breaker. I got a "gear
transition" light so I suspected no hydraulic pressure which was confirmed
when I looked at the gauge.
I figured
the best thing to do was to leave everything as it was and hand pump
the gear down and land. This worked just fine.
Now the problem was
that for the first time in over 600 hours of flying this thing, when I
had set the flaps at 10 degrees I had left the flap handle a little out of
the detent and the valve was just dumping the high side pressure
to the low side and just kept the hydraulic pump running.
Some days I think
that if every thing is going well I just create a problem for the
practice. At least my rebuild of the gear hand pump worked
well.
Dan
Reagan
IVP 650
hours