On Mon, 19 Apr 2004 14:11:33 -0400, Peter R.
wrote:

Peter Clark ) wrote:

I seem to recall checking two static ports in my 172SP - one just aft
of the cowling on the left side, and one aft of the door, left side.
Since it's got two holes, are they calling this a single port because
they plumb to the same line inside, or has an additional port been
added? Would blocking one of the two (since the line itself is still
vented to the outside) cause this, or would a blockage have to be
forward of the forward static port (where the lines merge) to cause a
problem?

Only the SPs that have a dual-axis AP have the secondary static port behind
the door on the pilot's side. The SPs without the dual-axis AP only have
the one port forward the door.

OK, another proof of the saying "you learn something new every day" -
thanks. Mine has the NavII with MFD and dual-axis with alt preselect.