TURIN,
you answered yourself to your question.
How do you motor an engine ?
You will always need a source of air , am i right ?
So the goal is to keep this source.
About ground staff , if you do not believe in them ... do it yourself.
muduckace , i guess you are saying : " yes , that is one for the fire department " ?
sorry mate , but i will not call the fire department every time an A/C get an inop APU ... and even if they are quick to act , i guess the A/C and do not forget , the PAX , the crew , etc , will be ........
Is there a fire extinguisher at every spot at the airport you are working ?
Salut.