What's it on a 1979 "T" tail Arrow

[Douglas Elder]

I was looking at a 1979 T tail Piper. I noticed an oval shaped "hole" in the leading edge of of the vertical fin with screening over it; what is it? I was thinking it might be related to the AC system.

 

[GRG55]

It's the inlet for the overhead cabin air vents. There's an optional blower on some Arrows to move air through the vents when on the ground.

 

[eman1200]

it's a convenient place for bees to hide and clog up the vent intake

 

[GRG55]

it's a convenient place for bees to hide and clog up the vent intake

It's a deliberate ploy by Piper to distract them from doing that to the pitot.