gh123
Posts: 645
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What Are These Intakes For On The 777?

Wed Nov 01, 2006 12:13 pm

I was under the impression that the air for the cabin came from the bleed system in the engines. If that is the case then what are these intakes for on the underside of the 777?

Thank you in advance.


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futureualpilot
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RE: What Are These Intakes For On The 777?

Wed Nov 01, 2006 12:16 pm

Intakes for the APU would be my best guess.
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N231YE
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RE: What Are These Intakes For On The 777?

Wed Nov 01, 2006 12:20 pm

I believe those are for the Pressurization and Air Conditioning Systems (PACS).

Someone with better knowledge (like an A&P) will be able to explain it more.
 
APFPilot1985
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RE: What Are These Intakes For On The 777?

Wed Nov 01, 2006 1:54 pm

Those are the inlets for the A/C packs.
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cdfmxtech
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RE: What Are These Intakes For On The 777?

Wed Nov 01, 2006 2:24 pm

The air for the Air Conditoning/pressurization system does come from the pneumatics supplied by engines (and the APU of course). But these Ram Air Inlets are necessary to cool the bleed air in order for it to be used as conditioned air. The process of getting the air to the required temperature involes a process of taking hot air, then cooling it, heating it again, then cooling it again (to explain it in simple terms). This COLD (or better said cooler) ram air aids in doing that.

Hope this helps.
 
nonfirm
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RE: What Are These Intakes For On The 777?

Wed Nov 01, 2006 3:55 pm

Ram air inlet for the a/c system.  airplane 
 
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HAWK21M
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RE: What Are These Intakes For On The 777?

Wed Nov 01, 2006 6:03 pm

Ram Air Inlet Doors.
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