....
Let me just add that No-one goes near large turboprop engines
to do anything when it's running because of the VERY obvious danger
...
Vortechs, that's not strictly true, unless I have a death-wish. I work a
RR/Allison T56/501 test cell, and need to go up onto the engine at least once
during the time it is in the cell to physically check for air/fuel/oil leaks - not
everything is visible from outside the safety zone. Using flags to look for
air leaks is almost useless due to prop-wash, even though the throttle is
moved towards reverse. The same needs to be done on the aircraft from time
to time .....