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obsolete
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 Posted: Dec 22, 2010 - 01:43 AM
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Newbie
Joined: Mar 20, 2010 - 10:20 PM
Posts: 5
Location: USAFE
Status: Offline
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We were talking at work the other night and no one had a precise answer, I could have gotten into the GS and probably found my answer, but by the time we got back to support I forgot about the question at hand.
Is there a valve in the aug fuel pump that opens and supplies fuel to the AFC when the throttle is placed in burner? Is there a constant flow of fuel through the AFC? Or does fuel just sit in the aug fuel pump and wait for the signal to go into burner?
I looked at a diagram, but it was pretty simple and didn't show any valves in any fuel component. Thanks for any info.
edit: I'm asking about F-110's. |
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Sponsor
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 Posted: May 22, 2013 - 1:01 AM
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F-16.net Sponsor
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That_Engine_Guy
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Posted: Dec 22, 2010 - 04:48 AM
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Elite 2K
Joined: Dec 14, 2005 - 05:03 AM
Posts: 2198
Location: Under the engine somewhere.
Status: Offline
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Looking at the diagram in front of me, (the general F110 control system diagram); yes there should be a valve of some sort. Shows an electrical signal for AB ON/OFF, and a servo fuel return from the AFC to the AFP. (The F100 uses 3 ESVs to meter fuel)
An AFP typically sends fuel at a low rate through the AFC even when the AB is OFF. This helps keep the internal components from getting too hot as the fuel flow acts as a coolant and lubricant internally. (The F100 is this way)
If you wanted to know the nuts/bolts of the F110 AFC you'd need to find the depot level TO that illustrates the breakdown and overhaul of the AFC.
Keep 'em flyin' 
TEG |
_________________
[Airplanes are] near perfect, all they lack is the ability to forgive.
— Richard Collins
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obsolete
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Posted: Dec 22, 2010 - 02:15 PM
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Newbie
Joined: Mar 20, 2010 - 10:20 PM
Posts: 5
Location: USAFE
Status: Offline
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Thanks for the reply TEG. The diagram I was looking at showed servo pressure, but I didn't know how much fuel it used for that. As for what you said about it possibly being a small amount of fuel that the AFP sends to the AFC at a constant rate, it makes sense. I know it's not a lot because the supply manifold to the AFC is [Link pending approval] inches in diameter, and there are no return lines anywhere near that size. Also, the reason I asked about a valve is because when it's real cold it seems like AFP's start leaking a lot. I have heard myths about valves sticking, which seemed weird to be, but running the motor up seems to "un-stick" whatever is in there.
I'll try to find a depot TO or just get into our GS when I get back to work and see if that explains it. |
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That_Engine_Guy
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Posted: Dec 23, 2010 - 07:57 PM
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Elite 2K
Joined: Dec 14, 2005 - 05:03 AM
Posts: 2198
Location: Under the engine somewhere.
Status: Offline
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I located the GS for a GE-Viper. The GS has the description of the AFC's internal workings, and how it uses fuel flow while 'off'.
TEG |
_________________
[Airplanes are] near perfect, all they lack is the ability to forgive.
— Richard Collins
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