"karel adams" wrote in message ...
In the "Instruments" chapter of my PPL ground school,
I was taught that many planes have two static ports
and a three-way valve to select between
"static" and "alternate static"

In the one plane I had the static problem, there was an alternate static (that
just opened into the cabin).

In my own plane, I was amused in that I do have two static ports (they are
teed together from opposite side of the plane). The mud dauber managed
to climb in past the tee to plug the thing up totally.