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What Are These Intakes For On The 777?  
User currently offlineGh123 From , joined Dec 1969, posts, RR:
Posted (6 years 6 months 3 weeks 6 days 7 hours ago) and read 4519 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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User currently offlineFutureUALpilot From United States of America, joined exactly 13 years ago today! , 2561 posts, RR: 8
Reply 1, posted (6 years 6 months 3 weeks 6 days 7 hours ago) and read 4520 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 (6 years 6 months 3 weeks 6 days 7 hours ago) and read 4516 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 (6 years 6 months 3 weeks 6 days 5 hours ago) and read 4461 times:

Those are the inlets for the A/C packs.

User currently offlineCdfMxTech From United States of America, joined Jul 2000, 1338 posts, RR: 29
Reply 4, posted (6 years 6 months 3 weeks 6 days 5 hours ago) and read 4447 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 (6 years 6 months 3 weeks 6 days 3 hours ago) and read 4408 times:

Ram air inlet for the a/c system.  airplane 

User currently offlineHAWK21M From India, joined Jan 2001, 31201 posts, RR: 58
Reply 6, posted (6 years 6 months 3 weeks 6 days 1 hour ago) and read 4358 times:

Ram Air Inlet Doors.
regds
MEL


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