Quote PAXboy
''This is a dumb question from a PAX.
Attach one of those long orange "Remove before flight"tags to the latch itself? It would trail on the ground and, if the a/c got to the stand, blow clearly in the wind.''
Like this?
Not such a dumb idea. This is the Airbus modification for IAE engines introduced last year. It's fitted to the lated A320 series and it holds the doors open slightly to make it obvious they aren't latched and the red flag dangles out of the cowling as well. Of course, it requires the engineer to engage and stow the pin the flag is attached to, but it's a major improvement