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Per,
I think it is most likely one of the cylinder piston seals. They donıt
always fail completely. I once had one that would leak only when the gear
was down. With the gear up the pressure did not decay and the pump did not
cycle. As soon as I put the gear down, every minute the pump would cycle
on for a second. Raise the gear and it was okay again.
Iım not sure why it would stop after 15 minutes, but maybe it has to do
with temperature of the cylinder and seal. If you can get it to happen on
the ground, cap one cylinder off at a time until you find it. It could be
one of the door cylinders, but I think they are less likely to be leaking.
Mine door cylinders have not leaked in 1250 flight hours.
Mike Reinath
LNC2 N3602M at 1250 TT
San Jose, CA
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