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Vapour Discharge from 747 at cruise altitude

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Vapour Discharge from 747 at cruise altitude

Old 1st Jan 2016, 21:48
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Vapour Discharge from 747 at cruise altitude

What is this being discharged from the underbelly of a BA 747 ? Presumably some sort of release valve for the air con system or something like that ?

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Old 1st Jan 2016, 21:58
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Grey water, sinks, galleys etc drained overboard.
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Old 1st Jan 2016, 22:31
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Originally Posted by Wodrick View Post
Grey water, sinks, galleys etc drained overboard.
Interesting. Never knew all that goes overboard. As long as the toilet contents don't I suppose !!
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Old 1st Jan 2016, 22:42
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Chemtrails.




Hey, somebody had to post that.
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Old 1st Jan 2016, 23:18
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so does it freeze to ice and drop straight down to skewer some poor clod on the ground?
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Old 1st Jan 2016, 23:49
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Originally Posted by lomapaseo View Post
so does it freeze to ice and drop straight down to skewer some poor clod on the ground?
..and furthermore isn't it a little uncomfortable to know that jets passing over our heads every day are dropping the contents of their sinks with God knows what sorts of jerms etc.
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Old 2nd Jan 2016, 04:21
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Old 2nd Jan 2016, 04:51
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Con...beat me by minutes.

The nasty stuff usually turns up as frozen blue ice....don't touch it.
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Old 2nd Jan 2016, 06:19
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747s ( at least prior to the -8 ) had open-to-atmosphere grey-water drains; lav and galley sink water flushed out immediately. The problem with that is that they sing like organ pipes at 500 kt.

As a result the 777 has valve-operated drains which only open when there's a certain pressure of fluid in the system. Edit: and according to a web search, the 787 has no external drains at all; all grey-water is captured in the lav tanks.

Surplus milk and beverages are disposed of via the toilets.

Last edited by El Bunto; 2nd Jan 2016 at 06:32.
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Old 2nd Jan 2016, 08:22
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If they are dropping "jerms" then, no problem.
On the other hand, if it's germs that is a different matter !
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Old 2nd Jan 2016, 10:58
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Don't jerms feed on chemtrails?
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Old 2nd Jan 2016, 11:44
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The long dark streaks you see on the underside of some aircraft are often from coffee poured down the drains:

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Old 2nd Jan 2016, 21:09
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The long dark streaks you see on the underside of some aircraft are often from coffee poured down the drains:
I couldn't be from hydraulic leakage, nobody would dispatch if that were the case would they?

How do they really know its coffee?? can they tell the difference between cafe and de-cafe? inquiring minds want to know
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Old 3rd Jan 2016, 08:36
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I am reliably informed that the red streaks on Concorde's undersides were caused by having to pour virtually full bottles of Château Brane Cantenac, etc., down the drain at the end of each flight.

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Old 3rd Jan 2016, 20:07
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The first thing the crew seem to do after boarding an aircraft is pour stuff down sinks this pleases the loaders underneath the drain immensely .....but they soon cheer up once they see that the majority of the drain effluent in landing on the aforementioned crews crew bags that are waiting to be loaded in hold 5
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