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CFM-56 Engines With Holes In The Cowling - Why?  
User currently offlineMr spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Posted (11 years 11 months 1 week 5 days 11 hours ago) and read 3567 times:

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"
5 replies: All unread, jump to last
 
User currently offlineB747skipper From , joined Dec 1969, posts, RR:
Reply 1, posted (11 years 11 months 1 week 5 days 4 hours ago) and read 3490 times:

...merely for engine accessories ventilation...
Equivalent inlets can be found under nacelles on DC8-70s and B-737s...
(s) Skipper


User currently offlineAir2gxs From , joined Dec 1969, posts, RR:
Reply 2, posted (11 years 11 months 1 week 5 days 4 hours ago) and read 3479 times:

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


User currently offlineMr Spaceman From Canada, joined Mar 2001, 2787 posts, RR: 9
Reply 3, posted (11 years 11 months 1 week 4 days 12 hours ago) and read 3392 times:

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 © 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"
User currently offlineAJ From Australia, joined Nov 1999, 2392 posts, RR: 24
Reply 4, posted (11 years 11 months 1 week 4 days 12 hours ago) and read 3381 times:

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!

User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3701 posts, RR: 34
Reply 5, posted (11 years 11 months 1 week 4 days 11 hours ago) and read 3377 times:
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The vents are for the nacelle anti-ice exhaust.

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