Mr Spaceman
Posts: 2723
Joined: Thu Mar 15, 2001 5:09 am

CFM-56 Engines With Holes In The Cowling - Why?

Fri Oct 18, 2002 8:26 am

Hi guys.

In the photos below of KC-135R Stratotankers you can see that their CFM-56 engines have what appears to be some sort of exhaust port in the cowling, near the intake along the bottom side area.

What are these exhaust ports used for? Do they have something to do with the ductwork for the intake heating pipes?

Also, are CFM-56 engines simply the military version of the same engines used on some civilian airliners? They look a lot like Pratt & Whitney 4000 turbofans.

If they are the same engines (both military & civilian), why do only the military versions have these exhaust ports in their cowlings? I've never seen these holes in the side of airliner's engines.


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Photo © Gerhard Plomitzer



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Photo © Tony Zeljeznjak



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Photo © Lauri Huima



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Photo © Stevis


Chris  Smile
"Just a minute while I re-invent myself"
 
Guest

RE: CFM-56 Engines With Holes In The Cowling - Why?

Fri Oct 18, 2002 3:00 pm

...merely for engine accessories ventilation...
Equivalent inlets can be found under nacelles on DC8-70s and B-737s...
(s) Skipper
 
air2gxs
Posts: 1443
Joined: Mon Jun 18, 2001 1:29 pm

RE: CFM-56 Engines With Holes In The Cowling - Why?

Fri Oct 18, 2002 3:22 pm

I believe the exhaust ports you're referring to are for the engine inlet anti-ice system. You put hot air in, its got to go somewhere.

George
 
Mr Spaceman
Posts: 2723
Joined: Thu Mar 15, 2001 5:09 am

RE: CFM-56 Engines With Holes In The Cowling - Why?

Sat Oct 19, 2002 7:09 am

Hi guys.

Thanks for your info.

Perhaps the accessories receiving ventilation, as mentioned by B747skipper, are indeed the pipes used for the engine inlet anti-ice system as mentioned by Airgxs.

I believe you can see the hot anti-ice bleed air pipes around the front of this engine.


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Photo © Gregg Stansbery



Regarding my question about whether or not CFM-56 engines were also used on civilian airliners, well, I believe I found the answer myself. Some Airbus A320s use CFM-56 engines, and some of these engines have similar exhausts/vents in their cowlings, and some of them don't.



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Photo © Rimilll



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Photo © Manuel Marin



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Photo © Frederic Backaert


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Photo © Peter Unmuth - Vienna Aviation Photography


Chris  Smile
"Just a minute while I re-invent myself"
 
AJ
Posts: 2295
Joined: Wed Nov 03, 1999 3:54 pm

RE: CFM-56 Engines With Holes In The Cowling - Why?

Sat Oct 19, 2002 7:23 am

The CFM-56 is used on Boeing 737-300s, 400s, 500s, 600s, 700s 800s and 900s, A319s, A320s, A321s and A340s, and the DC-8-70 series of re-engined DC-8s, to name a few!
 
VC-10
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Joined: Tue Oct 26, 1999 11:34 am

RE: CFM-56 Engines With Holes In The Cowling - Why?

Sat Oct 19, 2002 8:30 am

The vents are for the nacelle anti-ice exhaust.

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