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What Are These Intakes For On The 777?  
User currently offlineGh123 From , joined Dec 1969, posts, RR:
Posted (3 years 1 week 1 day 7 hours ago) and read 2094 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, joined May 2000, 2221 posts, RR: 9
Reply 1, posted (3 years 1 week 1 day 7 hours ago) and read 2094 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 (3 years 1 week 1 day 7 hours ago) and read 2090 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 (3 years 1 week 1 day 6 hours ago) and read 2035 times:

Those are the inlets for the A/C packs.

User currently offlineCdfMxTech From United States, joined Jul 2000, 1332 posts, RR: 34
Reply 4, posted (3 years 1 week 1 day 5 hours ago) and read 2021 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 , joined Dec 1969, posts, RR:
Reply 5, posted (3 years 1 week 1 day 4 hours ago) and read 1982 times:

Ram air inlet for the a/c system.  airplane 

User currently offlineHAWK21M From India, joined Jan 2001, 27728 posts, RR: 60
Reply 6, posted (3 years 1 week 1 day 2 hours ago) and read 1932 times:

Ram Air Inlet Doors.
regds
MEL


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