The bypass at a set pressure usually 8 to 10 psi differential presure across
the filter. It normalls bypasses when the oil is cold.

Mike
MU-2


"Newps" wrote in message
...


NW_PILOT wrote:



Dont airplane oil filter have a by-pass in them so they dont filter 100%
of
the oil?

I believe it's just like your car, they only bypass when the filter is
clogged.