Moderators: richierich, ua900, hOMSaR

 
User avatar
propilot83
Topic Author
Posts: 625
Joined: Sat Jan 27, 2001 2:41 am

Air Intake Ducts On 777 & 787 Dreamliner?

Thu Feb 25, 2016 6:01 am

Does anyone know what those air intake ducts are for on the underbelly of the Boeing 777 and 787? Is it for keeping the avionics and landing gear cool from overheating? Thanks.
 
User avatar
propilot83
Topic Author
Posts: 625
Joined: Sat Jan 27, 2001 2:41 am

RE: Air Intake Ducts On 777 & 787 Dreamliner?

Thu Feb 25, 2016 11:48 am

Anyone there? hello? Any Boeing engineer?
 
EMBQA
Posts: 7858
Joined: Sat Oct 25, 2003 3:52 am

RE: Air Intake Ducts On 777 & 787 Dreamliner?

Thu Feb 25, 2016 12:08 pm

Quoting propilot83 (Reply 1):

Without seeing a photo I'm sure its just part of the ACM System...
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
Dalmd88
Posts: 3075
Joined: Fri Jul 28, 2000 3:19 am

RE: Air Intake Ducts On 777 & 787 Dreamliner?

Thu Feb 25, 2016 1:38 pm

The two large ducts near the wing root are for the air conditioning packs. The air coming in through them, called ram air, blows across the heat exchangers and cools the bleed air before it enters the cabin. The outlets for the ram air are just forward of the gear wells. The system is very similar on all Boeing aircraft.
 
OldAeroGuy
Posts: 3913
Joined: Sun Dec 05, 2004 6:50 am

RE: Air Intake Ducts On 777 & 787 Dreamliner?

Fri Feb 26, 2016 12:29 am

But no bleed air on the 787.

Instead, air intakes on the 787 supply the electrically driven compressors that provide compressed air to the pressurized cabin.
Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
 
AA737-823
Posts: 5492
Joined: Wed Mar 01, 2000 11:10 am

RE: Air Intake Ducts On 777 & 787 Dreamliner?

Fri Feb 26, 2016 12:53 am

Quoting propilot83 (Reply 1):
Anyone there? hello? Any Boeing engineer?

Wow. Really?

Try helping us by posting a photo, or by being more specific with your question.
 
User avatar
Starlionblue
Posts: 19796
Joined: Fri Feb 27, 2004 9:54 pm

RE: Air Intake Ducts On 777 & 787 Dreamliner?

Fri Feb 26, 2016 3:04 am

Quoting Dalmd88 (Reply 3):
The system is very similar on all Boeing aircraft.

And Airbus for that matter.

Quoting propilot83 (Thread starter):
Is it for keeping the avionics and landing gear cool from overheating?

The landing gear doesn't need cooling per se. Sometimes the brakes need cooling, in which case the gear is left out (in the air) or actively cooled (on the ground) or you just wait (on the ground).

The avionics bay tends to be further forward, and has another (though related) cooling system.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
yeelep
Posts: 766
Joined: Mon Apr 04, 2011 7:53 pm

RE: Air Intake Ducts On 777 & 787 Dreamliner?

Fri Feb 26, 2016 3:57 am

Quoting OldAeroGuy (Reply 4):
But no bleed air on the 787.

Instead, air intakes on the 787 supply the electrically driven compressors that provide compressed air to the pressurized cabin.

Though they still have heat exchangers, that are fed by a ram air system.
In the picture. below the leading edge wing root you have the ram air/heat exchanger inlet, below that is the compressor intake and just forward of the gear well are the ram air/heat exchanger exhaust doors.

View Large View Medium
Click here for bigger photo!

Photo © Yari Strban

 
User avatar
propilot83
Topic Author
Posts: 625
Joined: Sat Jan 27, 2001 2:41 am

RE: Air Intake Ducts On 777 & 787 Dreamliner?

Sat Feb 27, 2016 6:05 am

Quoting Dalmd88 (Reply 3):

Makes sense, thank you, no wonder why TWA-800 exploded in mid-air, center fuel tank explosion.
 
User avatar
propilot83
Topic Author
Posts: 625
Joined: Sat Jan 27, 2001 2:41 am

RE: Air Intake Ducts On 777 & 787 Dreamliner?

Sun Feb 28, 2016 4:22 am

Quoting AA737-823 (Reply 5):
Wow. Really?

Try helping us by posting a photo, or by being more specific with your question.

Stop being so sarcastic, if you've knew the answer, you would have known better than the guy I praised Dalmd88.

Who is online

Users browsing this forum: DylanHarvey, Starlionblue and 33 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos