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What's That Streak On The Belly Of This A333  
User currently offlinePRFlyer From United States of America, joined Feb 2008, 308 posts, RR: 0
Posted (2 years 1 month 3 weeks 13 hours ago) and read 7044 times:

I was spotting in Manila during my recent trip and happen to take a shot of this Cathay Pacific A333. What is that pinkish streak on the belly of this plane? Is that hydraulic oil? I forgot to follow-up if this bird went tech but it arrived around 4PM Local time.

http://members.dslextreme.com/users/junsan/CP330.jpg

22 replies: All unread, jump to last
 
User currently offlinehorstroad From Germany, joined Apr 2010, 277 posts, RR: 0
Reply 1, posted (2 years 1 month 3 weeks 11 hours ago) and read 6974 times:

a hydraulic leak looks different. I guess it's coming from the drain mast right infront of the wing to body fairing, so it´s probably some waste from the galley that went through the sink

User currently offlineT prop From United States of America, joined Apr 2001, 1029 posts, RR: 1
Reply 2, posted (2 years 1 month 3 weeks 11 hours ago) and read 6973 times:

Quoting horstroad (Reply 1):
a hydraulic leak looks different. I guess it's coming from the drain mast right infront of the wing to body fairing, so it´s probably some waste from the galley that went through the sink

Coffee....


User currently offlineTod From Denmark, joined Aug 2004, 1729 posts, RR: 3
Reply 3, posted (2 years 1 month 3 weeks 5 hours ago) and read 6815 times:

Quoting T prop (Reply 2):
Coffee....

. . . .and red wine.


User currently offlineCCA From Hong Kong, joined Oct 2002, 841 posts, RR: 14
Reply 4, posted (2 years 1 month 2 weeks 6 days 15 hours ago) and read 6377 times:

Yep as T prop and Tod said.


C152 G115 TB10 CAP10 SR-22 Be76 PA-34 NDN-1T C500 A330-300 A340-300 -600 B747-200F -200SF -400 -400F -400BCF -400ERF -8F
User currently offlinefrancoflier From France, joined Oct 2001, 3809 posts, RR: 11
Reply 5, posted (2 years 1 month 2 weeks 5 days 23 hours ago) and read 6098 times:

It's an aircraft skid mark... Happens when an aircraft drinks lots of coffee.


Looks like I picked the wrong week to quit posting...
User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 6, posted (2 years 1 month 2 weeks 4 days 1 hour ago) and read 5662 times:

Galley drain mast liquid stains.....


Think of the brighter side!
User currently offlineclydenairways From Ireland, joined Jan 2007, 1275 posts, RR: 0
Reply 7, posted (2 years 1 month 2 weeks 6 hours ago) and read 5184 times:

Quoting HAWK21M (Reply 7):
Galley drain mast liquid stains.....

Are there any rules on what can be poured down there? It's left them a big job to clean that off now.


User currently offlinestrfyr51 From United States of America, joined Apr 2012, 1328 posts, RR: 1
Reply 8, posted (2 years 1 month 2 weeks 3 hours ago) and read 5125 times:
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seeing as to how it starts under the Air Conditioning bay it's eithe roil or hydraulic fluid residue

User currently offlinestrfyr51 From United States of America, joined Apr 2012, 1328 posts, RR: 1
Reply 9, posted (2 years 1 month 2 weeks 3 hours ago) and read 5122 times:
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Quoting strfyr51 (Reply 9):

BP 2197 turbine oil is dark Brown


User currently offlineDalmd88 From United States of America, joined Jul 2000, 2601 posts, RR: 15
Reply 10, posted (2 years 1 month 1 week 6 days 23 hours ago) and read 5062 times:

Quoting strfyr51 (Reply 9):
seeing as to how it starts under the Air Conditioning bay it's eithe roil or hydraulic fluid residue

Take a closer look. It's coming from the drain mast just fwd of the body fairings. I doubt the A/c packs use any oil. Most newer packs the acms have air bearings. I bet it's from coffee. It and milk should not be poured down the galley drains, but they do it all the time. Then they wonder why the drain smells and gets clogged.


User currently offlinetod From Denmark, joined Aug 2004, 1729 posts, RR: 3
Reply 11, posted (2 years 1 month 1 week 6 days 23 hours ago) and read 5050 times:

Quoting clydenairways (Reply 8):
Are there any rules on what can be poured down there? It's left them a big job to clean that off now.

Up to the airline, but its designed only for liquids.
I have had airlines request a placard for the forward galley saying NO COFFEE AFTER MAIN GEAR LOWERED.

747 are really bad for fouling the main gear.
It gets extra yucky when you pour milk and red wine at the same time.
When it passes through the heated drain mast just right, you get sticky pink cottage cheese.

[Edited 2012-10-10 13:53:52]

User currently offlineMSPNWA From United States of America, joined Apr 2009, 1993 posts, RR: 2
Reply 12, posted (2 years 1 month 1 week 6 days 21 hours ago) and read 5012 times:

Quoting tod (Reply 12):
747 are really bad for fouling the main gear.

I particularly notice the streaking on the bellies of 747s. I'd say it's the type with the most prominent staining.

I always wondered exactly what it was though. Now I know!


User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 13, posted (2 years 1 month 1 week 6 days 10 hours ago) and read 4884 times:

Quoting clydenairways (Reply 8):
Are there any rules on what can be poured down there? It's left them a big job to clean that off n

Maintenance Informed Flt ops to circulate instructions to Cabin crew to refrain from pouring Tea powder/coffee powder/semisolid down the sink, as these used to clog the drains......



Think of the brighter side!
User currently offlineMD11Engineer From Germany, joined Oct 2003, 14127 posts, RR: 62
Reply 14, posted (2 years 1 month 1 week 6 days 8 hours ago) and read 4841 times:

Quoting clydenairways (Reply 8):
Quoting HAWK21M (Reply 7):
Galley drain mast liquid stains.....

Are there any rules on what can be poured down there? It's left them a big job to clean that off now.

Defintely NOT milk, coffee filter content, tea leaves and orange juice together. The acid of the orange juice will make the milk coagulate and together with the coffee waste and tea leaves, it will clog the drain lines with a stinking mess.

Jan


User currently offlinetod From Denmark, joined Aug 2004, 1729 posts, RR: 3
Reply 15, posted (2 years 1 month 1 week 6 days 6 hours ago) and read 4820 times:

Quoting HAWK21M (Reply 14):
I particularly notice the streaking on the bellies of 747s. I'd say it's the type with the most prominent staining.

While I was at Boeing we tested various 747 forward drain mast configurations and even tried one that was three feet long.
The airflow still sucked the liquids right up against the flat belly no matter what we tried.


User currently offlineAA737-823 From United States of America, joined Mar 2000, 5913 posts, RR: 11
Reply 16, posted (2 years 1 month 1 week 2 days 14 hours ago) and read 4376 times:

Quoting Dalmd88 (Reply 11):
I doubt the A/c packs use any oil.

Don't tell Boeing that; the most popular jet airliner in history is still rolling down the assembly line with oil in the ACM's...


User currently offlineyeelep From United States of America, joined Apr 2011, 669 posts, RR: 0
Reply 17, posted (2 years 1 month 1 week 2 days 14 hours ago) and read 4373 times:

If you are referring to the 737, it has ACM's with air bearings since the first NG.

User currently offlineDarksnowynight From United States of America, joined Jan 2012, 1391 posts, RR: 3
Reply 18, posted (2 years 1 month 1 week 2 days 9 hours ago) and read 4298 times:

Quoting Dalmd88 (Reply 11):
Quoting strfyr51 (Reply 9):
seeing as to how it starts under the Air Conditioning bay it's eithe roil or hydraulic fluid residue

Take a closer look. It's coming from the drain mast just fwd of the body fairings. I doubt the A/c packs use any oil. Most newer packs the acms have air bearings. I bet it's from coffee. It and milk should not be poured down the galley drains, but they do it all the time. Then they wonder why the drain smells and gets clogged.

Yup. Also, it's way forward of the PACK bays. On 330s, those start right about three feet aft of the inlets, which here can be seen straddling the beacon. Looking close we see that this streak starts even forward of that point.

If it's galley juice, on the plus side it should wipe right off with a very mild solvent. At least it's not hyd residue from the overspill containers; that you need a for-real cleaning crew to get off once it dries (it gets wicked crusty and displaces a much wider patch than this streak).



Posting without Knowledge is simply Tolerated Vandalism... We are the Vandals.
User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 19, posted (2 years 1 month 1 week 12 hours ago) and read 3945 times:

Quoting MD11Engineer (Reply 14):
Defintely NOT milk, coffee filter content, tea leaves and orange juice together. The acid of the orange juice will make the milk coagulate and together with the coffee waste and tea leaves, it will clog the drain lines with a stinking mess.

It sure is a stinking mess,when it has to be reverse blown by nitrogen from the drain mast outlet  



Think of the brighter side!
User currently offlineTod From Denmark, joined Aug 2004, 1729 posts, RR: 3
Reply 20, posted (2 years 1 month 1 week 2 hours ago) and read 3884 times:

Quoting HAWK21M (Reply 19):
It sure is a stinking mess,when it has to be reverse blown by nitrogen from the drain mast outlet

Why nitrogen and not just compressed air?


User currently offlineflyingturtle From Switzerland, joined Oct 2011, 2451 posts, RR: 14
Reply 21, posted (2 years 1 month 1 week 2 hours ago) and read 3873 times:

Quoting Tod (Reply 20):

It is inert, i.e. it does not (easily) take part in chemical reactions.

http://en.wikipedia.org/wiki/Inert_gas


Apart from that... I don't know...  


David



Keeping calm is terrorism against those who want to live in fear.
User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 22, posted (2 years 1 month 5 days 12 hours ago) and read 3591 times:

Quoting Tod (Reply 20):
Why nitrogen and not just compressed air?

Since We have bottles of N2 freely available at the Mx department, as most places for servicing use N2...hence....
True.............. Compressed Air can be used for blockage cleaning.



Think of the brighter side!
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