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We have the hydraulic pump on our airplane 'cycle'
about every 3-5 minutes while on the ground as well as in flight, which means
that it runs for a second or so every once in a while. We ruled out the
possibility of air bubbles since the oil has been in the system for quite some
time, and we had cycled the gears really many times with the airplane on its
jacks. We knew it was due to an internal leak somewhere in the system but did
not know where, and certainly knew it would be a PITA trying to trouble-shoot
that. Then, I recently tried leaving the flaps down and noticed that when I turn
the master switch back on, the hydraulic pump doesn't make a sound. I have had
the flaps down for now 24 hours and the system still holds the
pressure.
I am curious to know if anyone else's airplane
behaves the same way and also if anyone here thinks the gear/flap selector
assembly has been designed that way, I don't know, maybe it is bad for the
system to stay pressurised for extend periods of time ?
Thanks, fili
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