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What Is Being Released From This At 737?  
User currently offlineJOshu From United States of America, joined Jun 2010, 148 posts, RR: 0
Posted (9 months 1 week 21 hours ago) and read 4528 times:

Hey all! On short final at BWI, N174AT was trailing this about 50 feet AGL. What is it?

http://www.flickr.com/photos/50407434@N02/9308170712/

Thanks!

14 replies: All unread, jump to last
 
User currently offlineDreadnought From United States of America, joined Feb 2008, 8711 posts, RR: 24
Reply 1, posted (9 months 1 week 19 hours ago) and read 4451 times:

Now we know one way how Airtran keeps their maintenance costs so low... 


Veni Vidi Castratavi Illegitimos
User currently offlineyeelep From United States of America, joined Apr 2011, 632 posts, RR: 0
Reply 2, posted (9 months 1 week 19 hours ago) and read 4420 times:

It's gray water from the aft galley/lavs.

User currently offlineArmitageShanks From UK - England, joined Dec 2003, 3556 posts, RR: 15
Reply 3, posted (9 months 1 week 19 hours ago) and read 4411 times:

Quoting yeelep (Reply 2):
It's gray water from the aft galley/lavs.

Does it just vent when water is used or does it have to reach a certain level in some tank then its pumped out? Does it ever freeze?


User currently offlinevikkyvik From United States of America, joined Jul 2003, 9401 posts, RR: 27
Reply 4, posted (9 months 1 week 18 hours ago) and read 4350 times:
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Quoting ArmitageShanks (Reply 3):
Does it just vent when water is used or does it have to reach a certain level in some tank then its pumped out? Does it ever freeze?

More importantly, who does it land on?  



"Two and a Half Men" was filmed in front of a live ostrich.
User currently offlineSAAFNAV From South Africa, joined Mar 2010, 254 posts, RR: 0
Reply 5, posted (9 months 1 week 17 hours ago) and read 4300 times:

Quoting ArmitageShanks (Reply 3):

Does it just vent when water is used or does it have to reach a certain level in some tank then its pumped out? Does it ever freeze?

Drainage masts for water are probably heated to prevent icing.



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User currently offlineyeelep From United States of America, joined Apr 2011, 632 posts, RR: 0
Reply 6, posted (9 months 1 week 16 hours ago) and read 4265 times:

Quoting ArmitageShanks (Reply 3):
Does it just vent when water is used or does it have to reach a certain level in some tank then its pumped out? Does it ever freeze?

The 737NG does not have a tank, it drains straight from the source to the mast. The only plane that I'm aware of that stores its grey water is the 787, it stores it in the waste tank and doesn't drain overboard. The water doesn't freeze because as SAAFNAV pointed out, the drain mast is heated.


User currently offlineTristarsteve From Sweden, joined Nov 2005, 3930 posts, RR: 34
Reply 7, posted (9 months 1 week 15 hours ago) and read 4218 times:

Quoting ArmitageShanks (Reply 3):
Does it just vent when water is used or does it have to reach a certain level in some tank then its pumped out? Does it ever freeze?

Older aircraft were just pipes leading overboard. In flight you can hear air hissing down the drain.
Newer aircraft sometimes have devices to stop the airleak.
As already stated B787 has no masts, just a great big toilet waste tank.
B777 has small holding devices that store the waste water in the drain pipe until an amount is there, then a pressure switch opens the valve and it all drains out.
Airbus aircraft have small float operated valves in every toilet and galley. These stop the air leaking until some liquid opens the float valve.


User currently offlineAA737-823 From United States of America, joined Mar 2000, 5639 posts, RR: 11
Reply 8, posted (9 months 1 week 14 hours ago) and read 4110 times:

Quoting JOshu (Thread starter):
At 737?

Heads up, the two-letter identifier for AirTran is FL, not At...

Quoting yeelep (Reply 2):
It's gray water from the aft galley/lavs.

As the AirTran 737s do not have aft galleys, this is lavatory sink drain water. The question is, who was using the aft lavatory sink so close to the ground!?!?

Quoting SAAFNAV (Reply 5):
Drainage masts for water are probably heated to prevent icing.

Indeed; once the airplane is in air mode, the drain mast heat activates. Drain mast heat circuit breakers must be pulled before maintenance puts the airplane into air mode artificially, otherwise, the masts will start smoking. They get VERY hot.

Quoting Tristarsteve (Reply 7):
As already stated B787 has no masts, just a great big toilet waste tank.

Well, yes, but ALL airliners have toilet waste tanks. This liquid isn't coming from a toilet, but a sink/basin. Important distinction.


User currently offlineKELPkid From United States of America, joined Nov 2005, 6265 posts, RR: 3
Reply 9, posted (9 months 1 week 13 hours ago) and read 4080 times:

Quoting AA737-823 (Reply 8):
As the AirTran 737s do not have aft galleys, this is lavatory sink drain water. The question is, who was using the aft lavatory sink so close to the ground!?!?

At 50' AGL, the pilot flying is probably beginning the flare. I'm sure a little bit of water that was trapped in the pipes gets freed up by the attitude change   NO one should be in the lav at this portion of the flight...



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineJOshu From United States of America, joined Jun 2010, 148 posts, RR: 0
Reply 10, posted (9 months 6 days 7 hours ago) and read 3571 times:

Quoting AA737-823 (Reply 8):
Heads up, the two-letter identifier for AirTran is FL, not At...

Ha! True...I was thinking about the registration as I edited the pic...totally forgot it was FL.

Anyway, he was only a few seconds away from touchdown and I was surprised to see it discharged so low considering it was Directly over Dorsey rd. when this was taken...just 3-4 seconds before flaring.


User currently offlineJAAlbert From United States of America, joined Jan 2006, 1492 posts, RR: 1
Reply 11, posted (9 months 3 days 7 hours ago) and read 3000 times:

So what, exactly, is grey water? Is this the waste from the toilets or the sinks in the galley and lavatories?

User currently offlineyeelep From United States of America, joined Apr 2011, 632 posts, RR: 0
Reply 12, posted (9 months 2 days 21 hours ago) and read 2879 times:

Quoting JAAlbert (Reply 11):

Its water from the lav. sinks and galley drains.


User currently offlineAA737-823 From United States of America, joined Mar 2000, 5639 posts, RR: 11
Reply 13, posted (9 months 2 days 1 hour ago) and read 2671 times:

Quoting JAAlbert (Reply 11):
Is this the waste from the toilets

Okay, once again, human waste is NOT DUMPED OVERBOARD.
I don't know why people insist on believing otherwise.


User currently offlineHAWK21M From India, joined Jan 2001, 31576 posts, RR: 57
Reply 14, posted (9 months 2 days ago) and read 2634 times:

Grey water from the aft galley, passing thru a drain mast that is heated to prevent the water from freezing.


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