SXDFC
Topic Author
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Joined: Sun Dec 09, 2007 6:07 pm

747 Tail Section Question

Fri May 23, 2008 11:10 pm

Hey Guys:

I was looking through some pictures of the 747 particularly this one :


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Photo © Ken Rose



And I have noticed that not only on that one but other 747's as well, there is a large dirt build up by the rudder, I think its the hydraulic acid- not sure? I have noticed this on many 747s and I always wondered why. I know the 747in the picture is unfortunately no longer with us, but any more info on why this is common - even along the wings too would be great!
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
 
474218
Posts: 4510
Joined: Mon Oct 10, 2005 12:27 pm

RE: 747 Tail Section Question

Fri May 23, 2008 11:34 pm

Nothing more than hydraulic fluid and dirt.
 
EMBQA
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RE: 747 Tail Section Question

Sat May 24, 2008 12:09 am

Most all power units leak a little.... on all aircraft.. and dirt will stick to the fluid residue.

[Edited 2008-05-23 17:17:13]
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
unattendedbag
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Joined: Wed Oct 08, 2003 10:35 pm

RE: 747 Tail Section Question

Sat May 24, 2008 9:07 am



Quoting SXDFC (Thread starter):
, I think its the hydraulic acid- not sure?

what is hydraulic acid?
Slower traffic, keep right
 
boeing767mech
Posts: 805
Joined: Fri Dec 15, 2000 5:03 pm

RE: 747 Tail Section Question

Sat May 24, 2008 10:26 am



Quoting UnattendedBag (Reply 3):
what is hydraulic acid

Skydrol...... Burns like hell when you get on your skin or in your eyes, so you thing it is acid. Also works good at stripping paint.

David
Never under-estimate the predictably of stupidty
 
474218
Posts: 4510
Joined: Mon Oct 10, 2005 12:27 pm

RE: 747 Tail Section Question

Sat May 24, 2008 1:51 pm



Quoting UnattendedBag (Reply 3):
what is hydraulic acid?

I am not sure what version of Skydrol is currently be used, but earlier versions like Skydrol 2 would actually eat away the tiny orifices in servos and actuators. Skydrol 3 was better and Skydrol 4 was less acidic.

Most aircraft and the ground support equipment (tugs, stands, etc.) are painted with polyurethane paint which stands up to Skydrol.
 
BAE146QT
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RE: 747 Tail Section Question

Sat May 24, 2008 4:40 pm



Quoting SXDFC (Thread starter):
there is a large dirt build up by the rudder,

You should also note that in that particular picture, the lower part of the aircraft's split rudder is angling away from the camera. You can see it if you look at the T in the logo.

I'm sure you're correct - there's filth there - but it might look worse because of shadowing. What light there is seems to be coming from directly overhead.
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EMBQA
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RE: 747 Tail Section Question

Sat May 24, 2008 7:36 pm



Quoting UnattendedBag (Reply 3):
what is hydraulic acid?

Stop by the hangar next time I'm working and I'll let you enjoy the thrill of getting Skydrol on you.....!! Fun stuff..!! Even worse in your eyes......
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
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HAWK21M
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RE: 747 Tail Section Question

Sat May 24, 2008 10:11 pm

Looks like a leaking PCU & dirt on the dripping fluid.

Quoting EMBQA (Reply 7):
Stop by the hangar next time I'm working and I'll let you enjoy the thrill of getting Skydrol on you.....!! Fun stuff..!! Even worse in your eyes......

A Mx folk advice.......Remember to wash off the skydrol from your hands before visiting the loo  Smile

regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
Skydrol
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Joined: Fri Oct 03, 2003 12:01 pm

RE: 747 Tail Section Question

Sun May 25, 2008 2:18 am



Quoting HAWK21M (Reply 8):



Quoting HAWK21M (Reply 8):
Quoting EMBQA (Reply 7):
Stop by the hangar next time I'm working and I'll let you enjoy the thrill of getting Skydrol on you.....!! Fun stuff..!! Even worse in your eyes......

A Mx folk advice.......Remember to wash off the skydrol from your hands before visiting the loo

Funny to see it refered to as hydraulic acid. But that sums up the consequence of skin exposure quite well.



LD4
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SFOMB67
Posts: 371
Joined: Thu Dec 08, 2005 1:20 pm

RE: 747 Tail Section Question

Sun May 25, 2008 3:53 am



Quoting 474218 (Reply 5):
am not sure what version of Skydrol is currently be used, but earlier versions like Skydrol 2 would actually eat away the tiny orifices in servos and actuators. Skydrol 3 was better and Skydrol 4 was less acidic.



Quoting Skydrol (Reply 9):
Funny to see it refered to as hydraulic acid

I too, have never heard it referred to as "hydraulic acid," but it does fit. Don't really know about the the differences in skydrol 2,3 &4, but I can tell you that used or aged skydrol out of an aircraft hyd system is a lot more acidic and 10 times nastier than new skydrol.
Not as easy as originally perceived
 
hangarrat
Posts: 428
Joined: Wed Jul 06, 2005 12:24 pm

RE: 747 Tail Section Question

Sun May 25, 2008 4:36 am



Quoting EMBQA (Reply 7):
Stop by the hangar next time I'm working and I'll let you enjoy the thrill of getting Skydrol on you.

How about the planeload of folks that got a complementary dousing a couple of years ago.

http://ntsb.gov/ntsb/brief2.asp?ev_i...616X00793&ntsbno=DFW05IA156&akey=1

/off topic

Looking at the pictures of those old TWA 741s, they seem to have dirtier rudders than other operators of 741s into the 1990s.
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