Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Cracks On Wings  
User currently offlineDemoose From Canada, joined Mar 2001, 1952 posts, RR: 23
Posted (7 years 1 month 1 week 5 days 14 hours ago) and read 2914 times:

Are cracks on wings common amonst aircraft?

I ask as yesterday i was onboard a 757-300 and half way through the flight noticed a pretty big crack on one part of the wing. At first I thought it was a dirty water mark, but looking closer i noticed they'd patched up some other areas near to it.

So what causes cracks such as this and does it affect the performance of the wing? I'm guessing its not a critical part of the wing hence it can fly fine with it?

http://i14.photobucket.com/albums/a317/ManchesterMark/753wing120CT07.jpg

Any input would be greatly appreciated

Thanks
Mark


Take a ride...fly across the sky
15 replies: All unread, jump to last
 
User currently onlineStarlionblue From Greenland, joined Feb 2004, 17108 posts, RR: 66
Reply 1, posted (7 years 1 month 1 week 5 days 14 hours ago) and read 2910 times:

You mean the lines on the flap track fairing? Look more like scratches to me. I don't know if they would affect performance much.


"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 2, posted (7 years 1 month 1 week 5 days 13 hours ago) and read 2882 times:

Cracks on the wings are fairly common. However, these cracks are so small special technique's such as X-Ray, Eddy Current and Ultra Sonic procedures are used to find them. If a crack is big enough for the untrained eye to see the aircraft should have been already repaired.

User currently offlineAccidentally From United States of America, joined Dec 2000, 643 posts, RR: 0
Reply 3, posted (7 years 1 month 1 week 5 days 12 hours ago) and read 2868 times:
Support Airliners.net - become a First Class Member!

Looks like grime to me...I bet you could go wipe that hydraulic fluid or whatever right off.


Cory Crabtree - crab453 - Indianapolis - 2R2 - 1966 PA-32-260
User currently offlineJetMech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 4, posted (7 years 1 month 1 week 5 days 12 hours ago) and read 2849 times:

Quoting Demoose (Thread starter):

If the "cracks" are what I think your talking about, I'd say that your photo is showing dirt streaks on the side of the canoe fairing that covers the flap track. The patched up area (light grey) is most probably the scuff resistant paint that is used due to the smaller section of flap rubbing up against the side of the canoe fairing.

Regards, JetMech



JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlineTristarSteve From Sweden, joined exactly 9 years ago today! , 4052 posts, RR: 33
Reply 5, posted (7 years 1 month 1 week 5 days 11 hours ago) and read 2823 times:

The flap track fairing is completely non-structural, in fact the aircraft can fly with it removed.
It is made of very thin fibregalss, and the paint quite often cracks as the fibreglass flexes.
No worries.
Steve


User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 6, posted (7 years 1 month 1 week 5 days 9 hours ago) and read 2778 times:

Quoting Demoose (Thread starter):
Are cracks on wings common amonst aircraft?

Cracks of the primary wing structure (skin and spars) are uncommon. The flap fairing you're showing isn't really structural at all, just aerodynamic. Cracks there certainly happen, although you don't really want them. In this particular case, it's very difficult to tell if that's just a crack in the paint (zero impact), a crack in the resin (annoying but not a particularly huge deal), or a through crack (very unlikely for a composite part).

Quoting Demoose (Thread starter):
So what causes cracks such as this and does it affect the performance of the wing? I'm guessing its not a critical part of the wing hence it can fly fine with it?

Fatigue is the usual source of cracking. The flap fairings get a lot of vibration during takeoff and landing. The crack you are showing doesn't have any impact on the wing performance. You can't fly without it without getting permission from your regulator first (there are other parts that are pre-authorized to fly without).

Tom.


User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 7, posted (7 years 1 month 1 week 5 days 9 hours ago) and read 2776 times:

Quoting Demoose (Thread starter):
At first I thought it was a dirty water mark, but looking closer i noticed they'd patched up some other areas near to it.

What you see in your photo is just dirt streaking. The 'patched up' area is just teflon paint used in the area that the flap moves. Teflon paint is used to protect the area from the rubbing of the flap seal runs. You will also see this on aircraft with movable horizontal stabs. Teflon paint is used there to protect the fuselage from the stabs seal.

[Edited 2007-10-13 11:10:32]


"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineDemoose From Canada, joined Mar 2001, 1952 posts, RR: 23
Reply 8, posted (7 years 1 month 1 week 5 days 9 hours ago) and read 2758 times:

it wasn't just dirt, i looked closely at it during the flight as i first thought it was just fluid marks, but noticed when we turned and the sunglight caugh it you could see it was a crack in the surface, it wasn't just a dirt mark.

Thanks for the replies guys, interesting to find it all out.



Take a ride...fly across the sky
User currently onlineAaron747 From Japan, joined Aug 2003, 8219 posts, RR: 26
Reply 9, posted (7 years 1 month 1 week 5 days 8 hours ago) and read 2745 times:

Don't look at dirt so closely anymore. Next time you'll be staring at a dirt or skydrol streak on an aileron for hours wondering when the thing is going to break off  Wink


If you need someone to blame / throw a rock in the air / you'll hit someone guilty
User currently offlineFr8mech From United States of America, joined Sep 2005, 5599 posts, RR: 15
Reply 10, posted (7 years 1 month 1 week 5 days 8 hours ago) and read 2743 times:

Quoting Demoose (Reply 8):
it wasn't just dirt, i looked closely at it during the flight as i first thought it was just fluid marks, but noticed when we turned and the sunglight caugh it you could see it was a crack in the surface, it wasn't just a dirt mark

You looked at it from at least 10 feet away, through a thick pane of glass and a thin piece of plastic.

I can say, looking at the picture and relying on 20 years in maintenance, that the chances that the fairing is cracked are just about zero.

As many have said, it appears to be dirt/grime/grease.



When seconds count...the police are minutes away.
User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 11, posted (7 years 1 month 1 week 5 days 5 hours ago) and read 2703 times:

Quoting Fr8mech (Reply 10):
You looked at it from at least 10 feet away, through a thick pane of glass and a thin piece of plastic.

No glass in passenger windows, just plastic.


User currently onlineStarlionblue From Greenland, joined Feb 2004, 17108 posts, RR: 66
Reply 12, posted (7 years 1 month 1 week 4 days 23 hours ago) and read 2621 times:

Quoting Aaron747 (Reply 9):
Next time you'll be staring at a dirt or skydrol streak on an aileron for hours wondering when the thing is going to break off

I thought the dirt and Skydrol were the only things that kept AF planes in one piece.  Wink



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 13, posted (7 years 1 month 1 week 4 days 21 hours ago) and read 2616 times:

Quoting Starlionblue (Reply 12):

I thought the dirt and Skydrol were the only things that kept AF planes in one piece.

Speed tape.

Tom.


User currently offlineHAWK21M From India, joined Jan 2001, 31702 posts, RR: 56
Reply 14, posted (7 years 1 month 1 week 4 days 16 hours ago) and read 2589 times:

Looks like dirt on the Flap track fairing.
regds
MEL



Think of the brighter side!
User currently offlineBoeing767mech From United States of America, joined Dec 2000, 1030 posts, RR: 3
Reply 15, posted (7 years 1 month 1 week 3 days 8 hours ago) and read 2369 times:

That flap track in the pictures looks like the fairing that shares MLG trunion fairing. The fluid looks like everyones favorite skydrol, Or maybe deicing fluid.

David



Never under-estimate the predictably of stupidty
Top Of Page
Forum Index

Reply To This Topic Cracks On Wings
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Purpose Of The "grey Stripe" On Wings posted Mon Apr 2 2007 03:27:02 by United319
Nubs On Wings posted Fri Mar 30 2007 07:01:40 by CaptainJon
Sensors? On Wings posted Wed Mar 14 2007 02:43:41 by Femme
A/C Registration Marks On Wings posted Fri Oct 20 2006 08:22:49 by BOACVC10
Lettering On Wings: Why Not Done Anymore? posted Fri Jul 14 2006 03:52:03 by Airwave
Why No US. Reg Numbers On Wings? posted Fri Apr 28 2006 16:45:00 by Access-Air
Static Dischargers On Wings posted Tue Sep 13 2005 07:25:37 by Aviation
Why No Paint On Wings? posted Wed May 5 2004 12:55:05 by A380900
Can Someone Please Explain Condensation On Wings.. posted Wed Mar 19 2003 02:07:15 by FSPilot747
Engine Mounting On Wings posted Thu Oct 31 2002 09:02:09 by Saintsman

Sponsor Message:
Printer friendly format