jamesbuk
Posts: 3712
Joined: Mon May 02, 2005 11:52 pm

WARNING-- Hot Air Exhaust

Sat Dec 17, 2005 3:13 am

hi guys


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on this picture when you open it up look at the edges of the engine and roll your eyes round so it would be about 3oclock if it was a clock there is a vent and says
WARNING!! hot air exhaust
why would the air travel into the engine the back forwards in an engine to vent out

so my Q is what exacly is this vent for and its purpose


thanks guys

rgds --james--

EDIT-- change name appearance

[Edited 2005-12-16 19:14:44]
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Grbld
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RE: WARNING-- Hot Air Exhaust

Sat Dec 17, 2005 3:25 am

This is probably the engine anti-ice outlet. Hot bleed air from the engine is channeled to the front and flows around the engine inlet to warm it up and shed any ice that may have accumulated on the inlet as well as prevent more ice from building up.

Grbld.
 
BlatantEcho
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RE: WARNING-- Hot Air Exhaust

Sat Dec 17, 2005 4:17 am

I thought that was the oil breather on the big GEs.
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fr8mech
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Joined: Mon Sep 26, 2005 9:00 am

RE: WARNING-- Hot Air Exhaust

Sat Dec 17, 2005 4:27 am

Quoting BlatantEcho (Reply 2):
thought that was the oil breather on the big GEs

Nope, nacelles anti-ice exhaust. The breather sits further back on the engine and it would be a whole lot of unnecessary tubing to run it forward.
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HAWK21M
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RE: WARNING-- Hot Air Exhaust

Sat Dec 17, 2005 4:43 am

Quoting BlatantEcho (Reply 2):
thought that was the oil breather on the big GEs.

Too Forward to be the Breather.Looks more like the Cowl Antiice Exhaust.
regds
MEL
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jamesbuk
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RE: WARNING-- Hot Air Exhaust

Sat Dec 17, 2005 4:46 am

would the anti ice be in like a tube that would circulate round the inlet and that being the exaust of that because if it was just a random outlet it wouldnt do much at 38000 feet
You cant have your cake and eat it... What the hells the point in having it then!!!
 
airfoilsguy
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Joined: Sun Oct 09, 2005 7:28 am

RE: WARNING-- Hot Air Exhaust

Sat Dec 17, 2005 11:02 am

My question is if you are close enough to a running engine to worry about the exhaust from that vent, shouldn't you be a bit more worried about getting sucked into the engine?
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kaddyuk
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Joined: Thu Nov 08, 2001 1:04 am

RE: WARNING-- Hot Air Exhaust

Sat Dec 17, 2005 12:37 pm

Quoting Airfoilsguy (Reply 6):
My question is if you are close enough to a running engine to worry about the exhaust from that vent, shouldn't you be a bit more worried about getting sucked into the engine?

Not always, if you have to manually open the start valve on a jet, that requires being close to the engine and if they have for any reason left anti-icing on (which they normally shouldnt) then hot air will start to pour out.

Another is when an aircraft lands... if they shut the anti-icing off on the taxi to the terminal, hot gasses may still be coming out of the nacelle even after shutdown...
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fr8mech
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Joined: Mon Sep 26, 2005 9:00 am

RE: WARNING-- Hot Air Exhaust

Sat Dec 17, 2005 12:39 pm

Quoting Airfoilsguy (Reply 6):
My question is if you are close enough to a running engine to worry about the exhaust from that vent, shouldn't you be a bit more worried about getting sucked into the engine?

The system can also be operated on the ground for test purposes.
When seconds count...the police are minutes away.
 
Grbld
Posts: 349
Joined: Tue Dec 06, 2005 9:25 pm

RE: WARNING-- Hot Air Exhaust

Sat Dec 17, 2005 11:15 pm

Quoting Kaddyuk (Reply 7):
if they shut the anti-icing off on the taxi to the terminal, hot gasses may still be coming out of the nacelle even after shutdown

Except when you're in icing conditions when taxiing in. Most operators (all?) leave engine anti-ice on during taxi-in. Even though you're using relatively low thrust settings, there's still no reason not to avoid having ice build up on the inlet and break off, being ingested by the engine.

It is, obviously more critical when taxiing out for takeoff, so anti-ice will go on on the ground after engine start.

Grbld.
 
Fly2HMO
Posts: 7207
Joined: Sat Jan 24, 2004 12:14 pm

RE: WARNING-- Hot Air Exhaust

Sun Dec 18, 2005 2:05 am

What engine is it anyways? I'm pretty sure it's not a GE90, isn't that a Trent?

[Edited 2005-12-17 18:06:28]
 
SFOMB67
Posts: 371
Joined: Thu Dec 08, 2005 1:20 pm

RE: WARNING-- Hot Air Exhaust

Sun Dec 18, 2005 4:05 pm

Quoting Jamesbuk (Reply 5):
would the anti ice be in like a tube that would circulate round the inlet and that being the exaust of that because if it was just a random outlet it wouldnt do much at 38000 feet

The anti-ice tube is a circular tube just behind the silver L/E on the nose cowl. It generally has small holes in it to allow the hot anti-ice air to spray the nose cowl L/E and the exhaust will prevent pressure build-up by dumping the excess overboard.
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Molykote
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RE: WARNING-- Hot Air Exhaust

Sun Dec 18, 2005 7:32 pm

Quoting FLY2HMO (Reply 10):
What engine is it anyways? I'm pretty sure it's not a GE90, isn't that a Trent?

It's a GE90-94B. The spinner is a good way to distinguish some of the larger engines in my experience. I'd be lying however if I said I didn't double check this in my "2005 Turbine-Engined Fleets of the World's Airlines" book provided by Air BP prior to posting. This variant of the GE90 also has fairly straight blades compared to the -115B version or a Trent.
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