I am curious about the phrase "around the horn." I have heard and read many references to this term in the context of engine starts, flameouts, re-lights, etc., but I have never found a good explanation of precisely what it means.
I was thinking perhaps the "horn" is some kind of detent commonly found on jet throttles, or maybe an engine instrument indication of some kind. Can anyone shed some light on this for me? Many thanks in advance. Apologies if this is more properly discussed in Tech-ops; I wasn't sure.