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What's That Streak On The Belly Of This A333

PRFlyer From United States of America, joined Feb 2008, 246 posts, RR: 0
Posted (8 months 2 weeks 5 days 14 hours ago) and read 5411 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.

22 replies: All unread, jump to last

horstroad From Germany, joined Apr 2010, 189 posts, RR: 0
Reply 1, posted (8 months 2 weeks 5 days 12 hours ago) and read 5341 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

T prop From United States of America, joined Apr 2001, 996 posts, RR: 1
Reply 2, posted (8 months 2 weeks 5 days 12 hours ago) and read 5340 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....

Tod From Denmark, joined Aug 2004, 1687 posts, RR: 3
Reply 3, posted (8 months 2 weeks 5 days 6 hours ago) and read 5182 times:

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

. . . .and red wine.

CCA From Hong Kong, joined Oct 2002, 715 posts, RR: 14
Reply 4, posted (8 months 2 weeks 4 days 16 hours ago) and read 4744 times:

Yep as T prop and Tod said.

C152 G115 TB10 CAP10 Be76 C500 A330-300 A340-300 -600 B747-200F -200SF -400 -400F -400BCF -400ERF -8F

francoflier From France, joined Oct 2001, 3253 posts, RR: 10
Reply 5, posted (8 months 2 weeks 4 days ago) and read 4465 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...

HAWK21M From India, joined Jan 2001, 31228 posts, RR: 58
Reply 6, posted (8 months 2 weeks 2 days 2 hours ago) and read 4029 times:

Galley drain mast liquid stains.....

Think of the brighter side!

clydenairways From Ireland, joined Jan 2007, 1027 posts, RR: 0
Reply 7, posted (8 months 1 week 5 days 6 hours ago) and read 3551 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.

strfyr51 From United States of America, joined Apr 2012, 488 posts, RR: 0
Reply 8, posted (8 months 1 week 5 days 3 hours ago) and read 3492 times:

seeing as to how it starts under the Air Conditioning bay it's eithe roil or hydraulic fluid residue

strfyr51 From United States of America, joined Apr 2012, 488 posts, RR: 0
Reply 9, posted (8 months 1 week 5 days 3 hours ago) and read 3489 times:

Quoting strfyr51 (Reply 9):

BP 2197 turbine oil is dark Brown

Dalmd88 From United States of America, joined Jul 2000, 2370 posts, RR: 15
Reply 10, posted (8 months 1 week 5 days ago) and read 3429 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.

tod From Denmark, joined Aug 2004, 1687 posts, RR: 3
Reply 11, posted (8 months 1 week 5 days ago) and read 3417 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]

MSPNWA From United States of America, joined Apr 2009, 1591 posts, RR: 4
Reply 12, posted (8 months 1 week 4 days 22 hours ago) and read 3379 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!

HAWK21M From India, joined Jan 2001, 31228 posts, RR: 58
Reply 13, posted (8 months 1 week 4 days 11 hours ago) and read 3251 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!

MD11Engineer From Germany, joined Oct 2003, 13369 posts, RR: 64
Reply 14, posted (8 months 1 week 4 days 8 hours ago) and read 3208 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

tod From Denmark, joined Aug 2004, 1687 posts, RR: 3
Reply 15, posted (8 months 1 week 4 days 7 hours ago) and read 3187 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.

AA737-823 From United States of America, joined Mar 2000, 5385 posts, RR: 11
Reply 16, posted (8 months 1 week 15 hours ago) and read 2743 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...

yeelep From United States of America, joined Apr 2011, 531 posts, RR: 0
Reply 17, posted (8 months 1 week 15 hours ago) and read 2740 times:

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

Darksnowynight From United States of America, joined Jan 2012, 1013 posts, RR: 2
Reply 18, posted (8 months 1 week 10 hours ago) and read 2665 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.

HAWK21M From India, joined Jan 2001, 31228 posts, RR: 58
Reply 19, posted (8 months 5 days 13 hours ago) and read 2312 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!

Tod From Denmark, joined Aug 2004, 1687 posts, RR: 3
Reply 20, posted (8 months 5 days 3 hours ago) and read 2251 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?

flyingturtle From Switzerland, joined Oct 2011, 1382 posts, RR: 9
Reply 21, posted (8 months 5 days 3 hours ago) and read 2240 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

Even a letdown, if it is thoroughly and final, is a step forward.

HAWK21M From India, joined Jan 2001, 31228 posts, RR: 58
Reply 22, posted (8 months 3 days 13 hours ago) and read 1958 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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