I was just on a 2 hr MD-80 flight in which I was seated on the port side over the wing at the exit seat. I was over looking an access panel (oval about 1’ x 2’ ) on the wing. Just after takeoff, fluid (not much) streamed from the gasket and some of the fasteners. I figured this was water from a morning rain and by the stains on the wing this was not the first time it happened. At mid flight it still seemed to have something wet around it (at 33K’ ).
What is this access panel for and was I seeing fuel?