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I've been flying my Lancair 360 for 8 yrs from Ryan
field, Tucson, where a temperature change of 30+* F a day is common. I
routinely open the "dump" valve on shut down. Works fine, --- the pump
runs every time when switched to the "up" position. Also prevents holding
high hydraulic system pressure when the plane is not in use. As an aside,
I'm still using the original "dump" valve as furnished by Lancair back in 1995
with no leaks (there was some discussion years back when some contended that the
Lancair valve was not suitable).
Byron Eskesen
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