PRFlyer
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What's That Streak On The Belly Of This A333

Wed Oct 03, 2012 6:12 am

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
 
Horstroad
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RE: What's That Streak On The Belly Of This A333

Wed Oct 03, 2012 8:37 am

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
 
T prop
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RE: What's That Streak On The Belly Of This A333

Wed Oct 03, 2012 8:39 am

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....
 
Tod
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RE: What's That Streak On The Belly Of This A333

Wed Oct 03, 2012 2:53 pm

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

. . . .and red wine.
 
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CCA
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RE: What's That Streak On The Belly Of This A333

Thu Oct 04, 2012 4:18 am

Yep as T prop and Tod said.
P1 in A330, A340, A346, B742, B744, B748.
 
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Francoflier
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RE: What's That Streak On The Belly Of This A333

Thu Oct 04, 2012 9:03 pm

It's an aircraft skid mark... Happens when an aircraft drinks lots of coffee.
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HAWK21M
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RE: What's That Streak On The Belly Of This A333

Sat Oct 06, 2012 7:04 pm

Galley drain mast liquid stains.....
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Clydenairways
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RE: What's That Streak On The Belly Of This A333

Wed Oct 10, 2012 2:07 pm

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.
 
strfyr51
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RE: What's That Streak On The Belly Of This A333

Wed Oct 10, 2012 5:09 pm

seeing as to how it starts under the Air Conditioning bay it's eithe roil or hydraulic fluid residue
 
strfyr51
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RE: What's That Streak On The Belly Of This A333

Wed Oct 10, 2012 5:12 pm

Quoting strfyr51 (Reply 9):

BP 2197 turbine oil is dark Brown
 
Dalmd88
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RE: What's That Streak On The Belly Of This A333

Wed Oct 10, 2012 8:34 pm

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.
 
Tod
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RE: What's That Streak On The Belly Of This A333

Wed Oct 10, 2012 8:53 pm

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]
 
MSPNWA
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RE: What's That Streak On The Belly Of This A333

Wed Oct 10, 2012 10:29 pm

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!
 
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HAWK21M
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RE: What's That Streak On The Belly Of This A333

Thu Oct 11, 2012 9:35 am

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......
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MD11Engineer
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RE: What's That Streak On The Belly Of This A333

Thu Oct 11, 2012 12:11 pm

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
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Tod
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RE: What's That Streak On The Belly Of This A333

Thu Oct 11, 2012 1:52 pm

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.
 
AA737-823
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RE: What's That Streak On The Belly Of This A333

Mon Oct 15, 2012 5:43 am

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...
 
yeelep
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RE: What's That Streak On The Belly Of This A333

Mon Oct 15, 2012 5:52 am

If you are referring to the 737, it has ACM's with air bearings since the first NG.
 
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DarkSnowyNight
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RE: What's That Streak On The Belly Of This A333

Mon Oct 15, 2012 10:20 am

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).
You Sir, are a very funny lady.
 
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HAWK21M
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RE: What's That Streak On The Belly Of This A333

Wed Oct 17, 2012 7:23 am

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  
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Tod
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RE: What's That Streak On The Belly Of This A333

Wed Oct 17, 2012 5:35 pm

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?
 
flyingturtle
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RE: What's That Streak On The Belly Of This A333

Wed Oct 17, 2012 5:49 pm

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...  


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HAWK21M
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RE: What's That Streak On The Belly Of This A333

Fri Oct 19, 2012 7:44 am

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.
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