Originally Posted by
a5in_the_sim
A beacon/light on the engine intake might make the association of "This Engine is Engine Running" more obvious. The ground staff rushing to open cargo doors adjacent to a still running Engine #2 in a common scenario. Rush Rush is the culture of LoCost Travel and contracted airport providers.
It's also more polite than my first idea which was a neon light next to the aircraft cargo door flashing "F##k Off Suicidal Tw#t"!
Why not just light up the spinner when the engine is turning?