I have heard more than a few times complaints and concerns about the racket a DC-9 APU fills the rear cabin with. Any nominations for the most vociferous units? Or most likely to drop the A and simply be a PU?
Gentlemen, APU's are "Started" or "Shut down". Lights, pumps etc are
"switched" on or off.
On the phrase "shut down" I am in agreement kind sir, however for starting, I prefer to light my turbines. When running, I consider them lit.
Is my vernacular old fashioned?