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747 Tail Section Question  
User currently offlineSXDFC From United States of America, joined Dec 2007, 2442 posts, RR: 23
Posted (6 years 7 months 2 days 14 hours ago) and read 3820 times:

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.
11 replies: All unread, jump to last
 
User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 1, posted (6 years 7 months 2 days 14 hours ago) and read 3805 times:

Nothing more than hydraulic fluid and dirt.

User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 2, posted (6 years 7 months 2 days 13 hours ago) and read 3793 times:

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"
User currently offlineUnattendedBag From United States of America, joined Oct 2003, 2342 posts, RR: 1
Reply 3, posted (6 years 7 months 2 days 4 hours ago) and read 3708 times:



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

what is hydraulic acid?



Slower traffic, keep right
User currently offlineBoeing767mech From United States of America, joined Dec 2000, 1031 posts, RR: 3
Reply 4, posted (6 years 7 months 2 days 3 hours ago) and read 3693 times:



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
User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 5, posted (6 years 7 months 1 day 23 hours ago) and read 3635 times:



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.


User currently offlineBAe146QT From United Kingdom, joined Sep 2006, 996 posts, RR: 0
Reply 6, posted (6 years 7 months 1 day 20 hours ago) and read 3594 times:



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.



Todos mis dominós son totalmente pegajosos
User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 7, posted (6 years 7 months 1 day 18 hours ago) and read 3554 times:



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"
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 8, posted (6 years 7 months 1 day 15 hours ago) and read 3518 times:

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



Think of the brighter side!
User currently offlineSkydrol From Canada, joined Oct 2003, 983 posts, RR: 10
Reply 9, posted (6 years 7 months 1 day 11 hours ago) and read 3478 times:



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



∙ ---{--« ∙ ----{--« ∙ --{-« ∙ ---{--« ∙ --{--« ∙ --{-« ∙ ----{--« ∙
User currently offlineSfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 10, posted (6 years 7 months 1 day 9 hours ago) and read 3459 times:



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
User currently offlineHangarRat From United States of America, joined Jul 2005, 633 posts, RR: 0
Reply 11, posted (6 years 7 months 1 day 9 hours ago) and read 3449 times:



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.



Spell check is a false dog
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