Code90
Pre-takeoff checklist
On the side of a piper Lance, behind the left seat window, there is an air port on a post. I suspect I should know what the thing is, but I don't. So I submit myself humbly before the POH wiseguys (I mean wise ones). What is it? I have lost the remove before flight cover for it and need to figure out what to search for to find a replacement.
Picture attached.
Picture attached.