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Originally Posted by skyking
consider a bay with an open outlet scheme.
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I'm not sure what you mean by that, but imagine the situation is more complex than the P51 Mustang radiator situation.
What I mean to say is we see these 747 NCAC inlets, so where are the outlets?
EDIT-1:
Found an answer to my question.
What are those in the belly of a 747?
https://aviation.stackexchange.com/q...belly-of-a-747
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The forward ones are a ram air inlet (NACA duct) for the Environmental conditioning System (ECS) and what looks like an antenna. The aft one is an exit louver for the ECS.
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Go to the link, they seem to agree that the other thing is not an antenna, it's a drain. However the original close-up I posted looks more like a pilot tube to my eyes.
In the search I also found a couple of what's in the tail of the plane links.
https://lessonslearned.faa.gov/Japan...am2_pop_up.htm
https://aviation.stackexchange.com/q...ar-of-this-787
EDIT-2: Diagram of a later model's ECS system
https://www.boeing.com/commercial/ae...les/2012_q1/4/
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The Boeing 747‑8 includes a new environmental control system (ECS) that integrates the air supply control system and the cabin air-conditioning and temperature control system.
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