smokeonreadynow
Topic Author
Posts: 5
Joined: Thu Sep 27, 2012 12:30 am

Throttle Position Terminology - "Around The Horn"

Tue Feb 19, 2013 11:29 pm

Hello,
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.
 
David L
Posts: 8547
Joined: Tue May 18, 1999 2:26 am

RE: Throttle Position Terminology - "Around The Horn"

Wed Feb 20, 2013 2:06 pm

I found an example, rather than an explanation:

http://www.history.navy.mil/nan/gram...960s/1968/Pages%20from%20dec68.pdf

It seems to refer to moving the throttles between Idle and Cut-off on some aircraft. Perhaps a horn sounded if the throttles were moved into that region?
 
LMP737
Posts: 4810
Joined: Wed May 08, 2002 4:06 pm

RE: Throttle Position Terminology - "Around The Horn"

Wed Feb 20, 2013 6:32 pm

Quoting smokeonreadynow (Thread starter):
I was thinking perhaps the "horn" is some kind of detent commonly found on jet throttles,

That's basically what it is. On the F-14 throttle quadrant there's a stop in front of the cutout position. When starting the engines you push the throttle outboard, forward then back inboard again to the idle position. Hence the term "around the horn" since the stop kind of looks like a horn. Kind of.

[Edited 2013-02-20 10:37:37]
Never take financial advice from co-workers.
 
Legs
Posts: 246
Joined: Fri Jun 23, 2006 3:37 pm

RE: Throttle Position Terminology - "Around The Horn"

Wed Feb 20, 2013 8:45 pm

We've always called it 'going over the hump' from cut-off then back against the idle stop after lifting a lockout with your forefinger, like LMP737 described. Our engine runners and pilots generally call it out during engine start, and use that as a time hack for starter cut-out, light-off etc.

Ive got some experience with similar sorts of systems with 'soft detents' (my words) for afterburner engagement as well.

[Edited 2013-02-20 12:48:43]
 
LMP737
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Joined: Wed May 08, 2002 4:06 pm

RE: Throttle Position Terminology - "Around The Horn"

Wed Feb 20, 2013 9:31 pm

Quoting legs (Reply 3):
We've always called it 'going over the hump' from cut-off then back against the idle stop after lifting a lockout with your forefinger

Sounds like an F-18 thing.  
Never take financial advice from co-workers.
 
Legs
Posts: 246
Joined: Fri Jun 23, 2006 3:37 pm

RE: Throttle Position Terminology - "Around The Horn"

Thu Feb 21, 2013 4:52 am

Quoting LMP737 (Reply 4):
like an F-18 thing

It is indeed  

We used the same terminology back in the F-111 days too, though the it was the top portion of the throttle that you had to lift up to get from cutoff to idle.
 
LMP737
Posts: 4810
Joined: Wed May 08, 2002 4:06 pm

RE: Throttle Position Terminology - "Around The Horn"

Thu Feb 21, 2013 8:49 am

Quoting legs (Reply 5):
It is indeed

We used the same terminology back in the F-111 days too, though the it was the top portion of the throttle that you had to lift up to get from cutoff to idle.

Watching nugget F-18 pilots land on the boat was always fun. They would get a death grip on the trottle and go right through the mil stop into burner. The Hornt would be sitting there in the wire in full burner.  
Never take financial advice from co-workers.

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