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What Are These Intakes For On The 777?  
User currently offlineGh123 From , joined Dec 1969, posts, RR:
Posted (8 years 1 month 3 weeks 22 hours ago) and read 5986 times:

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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6 replies: All unread, jump to last
 
User currently offlineFutureUALpilot From United States of America, joined May 2000, 2608 posts, RR: 8
Reply 1, posted (8 years 1 month 3 weeks 22 hours ago) and read 5988 times:

Intakes for the APU would be my best guess.


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User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 2, posted (8 years 1 month 3 weeks 22 hours ago) and read 5984 times:

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.


User currently offlineAPFPilot1985 From , joined Dec 1969, posts, RR:
Reply 3, posted (8 years 1 month 3 weeks 21 hours ago) and read 5929 times:

Those are the inlets for the A/C packs.

User currently offlineCdfMxTech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 4, posted (8 years 1 month 3 weeks 20 hours ago) and read 5915 times:

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.


User currently offlineNonfirm From United States of America, joined Sep 2005, 434 posts, RR: 0
Reply 5, posted (8 years 1 month 3 weeks 19 hours ago) and read 5876 times:

Ram air inlet for the a/c system.  airplane 

User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 6, posted (8 years 1 month 3 weeks 17 hours ago) and read 5826 times:

Ram Air Inlet Doors.
regds
MEL



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