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What Is This Hole On The Belly Of The 787?  
User currently offlinezipsy From UK - England, joined Jul 2010, 56 posts, RR: 0
Posted (1 year 2 weeks 6 days 23 hours ago) and read 6377 times:

I'm interested what this hole on the belly of the 787 is for,any ideas?

Big version: Width: 1024 Height: 710 File size: 289kb


[Edited 2013-07-01 18:15:09]

15 replies: All unread, jump to last
 
User currently offlineStitch From United States of America, joined Jul 2005, 30532 posts, RR: 84
Reply 1, posted (1 year 2 weeks 6 days 22 hours ago) and read 6315 times:
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This looks like it is at the front of the wingbox, not the back, and I believe the APU battery drain plug is in the aft area per Boeing presentations.

User currently offlineweb500sjc From United States of America, joined Sep 2009, 726 posts, RR: 0
Reply 2, posted (1 year 2 weeks 6 days 8 hours ago) and read 5926 times:

the new battery drain?


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User currently offlineKarelXWB From Netherlands, joined Jul 2012, 10667 posts, RR: 30
Reply 3, posted (1 year 2 weeks 3 days 12 hours ago) and read 4993 times:

The battery exhaust should look like this:




Only two things are infinite, the universe and human stupidity. And I'm not sure about the universe.
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 4, posted (1 year 2 weeks 3 days 8 hours ago) and read 4910 times:

Any reason why the colour looks different in the opening thread pic of the area in question.


Think of the brighter side!
User currently offlinezipsy From UK - England, joined Jul 2010, 56 posts, RR: 0
Reply 5, posted (1 year 2 weeks 2 days 22 hours ago) and read 4787 times:

Found a better photo


User currently offlinedalmd88 From United States of America, joined Jul 2000, 2533 posts, RR: 14
Reply 6, posted (1 year 2 weeks 2 days 11 hours ago) and read 4652 times:

I'll take a guess. Exhaust for avionics cooling?

User currently offlineferpe From France, joined Nov 2010, 2800 posts, RR: 59
Reply 7, posted (1 year 2 weeks 1 day 19 hours ago) and read 4486 times:

Quoting zipsy (Reply 5):
Found a better photo

The hole is placed directly underneath the air cond (ECS) packs and should therefore be part of them I guess. Looks like some kind of drain hole perhaps for mositure? I think you can even see it in the principle picture below, the right hand pack has a tube that goes to the skin to expel something.

http://i298.photobucket.com/albums/mm262/ferpe_bucket/ECSdrainholeof787_zps23ba7701.jpg

http://i298.photobucket.com/albums/mm262/ferpe_bucket/787airconditioningpackinstallation_zps9de3a6f7.jpg

Seems like the form of the exit has evolved, my photo is from early prototypes and it is a flush back-angled exit, your exits seems to be with an exit cavity.

[Edited 2013-07-06 21:50:10]


Non French in France
User currently offlinezipsy From UK - England, joined Jul 2010, 56 posts, RR: 0
Reply 8, posted (1 year 2 weeks 1 day 3 hours ago) and read 4297 times:

I thought is was some sort of drain for moisture too.Makes perfect sense

User currently offlinebikerthai From United States of America, joined Apr 2010, 2063 posts, RR: 4
Reply 9, posted (1 year 2 weeks 10 hours ago) and read 4137 times:

Quoting ferpe (Reply 7):
Looks like some kind of drain hole perhaps for mositure?
Quoting zipsy (Reply 8):
I thought is was some sort of drain for moisture too.Makes perfect sense

Don't look like a drain hole for moisture. Moisture drains are relatively small and usually mounted flush with pressure valve.

Don't think it's the battery vent drain as the batteries are located in the electronic bays (fore and aft). That vent is also small.

Strange how the hole is recessed with what I presume to be a titanium fitting as it is not painted. So, what ever it is it, the exhaust temperature is expected to be greater than 250F (120 C).

bt



Intelligent seeks knowledge. Enlightened seeks wisdom.
User currently offlinekanban From United States of America, joined Jan 2008, 3383 posts, RR: 26
Reply 10, posted (1 year 2 weeks 7 hours ago) and read 4087 times:
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BT, I agree with you, however it is odd that it is only under one pac with a keel beam between them. Could we have something above the pac that requires exhaust venting?

User currently offlinebikerthai From United States of America, joined Apr 2010, 2063 posts, RR: 4
Reply 11, posted (1 year 2 weeks 4 hours ago) and read 4024 times:

Quoting kanban (Reply 10):

I wish Tom was still around. He would have been able to answer this off the top of his head.

bt



Intelligent seeks knowledge. Enlightened seeks wisdom.
User currently offlinezipsy From UK - England, joined Jul 2010, 56 posts, RR: 0
Reply 12, posted (1 year 1 week 6 days 21 hours ago) and read 3902 times:

Just got the answer in this thread http://airnation.net/hangar/threads/...hole-doing-on-the-b787-belly.5211/

User currently offlineferpe From France, joined Nov 2010, 2800 posts, RR: 59
Reply 13, posted (1 year 1 week 6 days 16 hours ago) and read 3847 times:

Yes, it is the Nitrogen generation system exhaust, it is placed together (a bit behind) the left ECS pack, here a picture of it, one can see the exhaust:




Non French in France
User currently offline7BOEING7 From United States of America, joined Oct 2012, 1499 posts, RR: 8
Reply 14, posted (1 year 1 week 6 days 3 hours ago) and read 3686 times:

Quoting bikerthai (Reply 9):
Don't look like a drain hole for moisture. Moisture drains are relatively small and usually mounted flush with pressure valve.

Except on the 777 where they all have "little fins" that cover the drains. They are easy off/on for drain replacement. This was an FAA requirement to prevent any fluid (fuel) getting back into the airplane "bilge" during a negative pressure condition.


User currently offlinebikerthai From United States of America, joined Apr 2010, 2063 posts, RR: 4
Reply 15, posted (1 year 1 week 5 days 9 hours ago) and read 3519 times:

Quoting 7BOEING7 (Reply 14):
This was an FAA requirement to prevent any fluid (fuel) getting back into the airplane "bilge" during a negative pressure condition.

So, would this be true for the 787 and new models? Or have they found new ways to deal with the back pressure?

bt



Intelligent seeks knowledge. Enlightened seeks wisdom.
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