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.
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.
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.
Sfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0 Reply 10, posted (5 years 6 months 2 weeks 6 days 2 hours ago) and read 2990 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.