Please dont underestimate peoples stupidity i once had to stop a guy from flying a PA28 because the antena of the GPS was stuck on the OUTSIDE of the aircraft with a suction cup , the lead went inside via the DV window.
Just to add to the fun when he took the thing off the outside he droped part of it into the heater air intake so the engineers had to de cowl the engine to recover it !.
Unfortunatly i feel i cant publish the chief engineers comments.