flybaurlax
Topic Author
Posts: 588
Joined: Sun Oct 05, 2008 12:34 am

Broken Flap At Trailing Edge

Thu Jan 13, 2011 2:31 am

I was deciding whether or not to post this, but I figured you guys are pretty clever and can probably figure out what happened. I flew on WN to go home for Christmas break, going from IND-MDW-LAX. This was on the plane for MDW-LAX. When we took our seats, my girlfriend noticed that there was something different in the trailing edge of one of the flaps, so I looked out and saw something surprising. There were 2 parts that were broken, but I could only get a shot of one. I reassured her that someone would have noticed it on either the FO walkaround or the ground crew walkaround. I hope I was right. Here's the first part: An actual cut in the trailing edge.




There was a section inboard to the damage above on the trailing edge of the wing that was damaged too. It looked like the metal was ruffled, or fringed, however you want to put it. My initial thoughts were that something backed up into the wing and damaged it, but the cut in the flap is so clean I was wondering if maybe that could be a quick fix to cut away the originally damaged section so it wouldn't propagate.

I'd like to know what you guys thing. Thanks
Boilerup! Go Purdue!
 
LTC8K6
Posts: 1444
Joined: Fri Jun 05, 2009 8:36 pm

RE: Broken Flap At Trailing Edge

Thu Jan 13, 2011 2:57 am

http://www.flyertalk.com/forum/conti...-700-small-piece-wing-missing.html

Seems it's not uncommon...

Quote:
Hi NYPDLieu, the part you're referring to is called an "Outboard Aft Flap" and is used to augment lift during take off and landing. The condition noted in your photos is actually an FAA-approved field repair that trims the end as noticed in the pictures. It's not too commonly used, but to be clear, there's nothing to be alarmed about when you see this.
 
flybaurlax
Topic Author
Posts: 588
Joined: Sun Oct 05, 2008 12:34 am

RE: Broken Flap At Trailing Edge

Thu Jan 13, 2011 3:42 am

Ok cool thanks. I figured it was a field repair because of the clean cut. I wasn't too worried about it, since it's such a small portion and at the trailing edge like that I wasn't too concerned during low speeds.
Boilerup! Go Purdue!
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: Broken Flap At Trailing Edge

Thu Jan 13, 2011 6:10 am

Quoting flybaurlax (Thread starter):
There was a section inboard to the damage above on the trailing edge of the wing that was damaged too. It looked like the metal was ruffled, or fringed, however you want to put it. My initial thoughts were that something backed up into the wing and damaged it, but the cut in the flap is so clean I was wondering if maybe that could be a quick fix to cut away the originally damaged section so it wouldn't propagate.

The "ruffled metal" sounds like speed tape (a shiny grey aluminum tape with strong adhesive, often mistaken for duct tape by non-aviation folks). Coupled with the temporary repair on the flap, I suspect somebody ran into the trailing edge and they put on some temporary repairs from the Structural Repair Manual to take care of it until they could perform the permanent repair.

The cut from the flap looks like they went into the honeycomb area, routed it clean, then potted and painted the exposed edge.

Tom.
 
etherealsky
Posts: 211
Joined: Fri Apr 09, 2010 6:13 pm

RE: Broken Flap At Trailing Edge

Fri Jan 14, 2011 12:20 pm

Is there a time limit on flying with that repair before it needs replacement?
"And that's why you always leave a note..."
 
b78710
Posts: 311
Joined: Fri Mar 24, 2006 4:21 am

RE: Broken Flap At Trailing Edge

Fri Jan 14, 2011 3:02 pm

Thats definately a repair, the radius is perfect and far to clean for it to be fresh damage. Good spot though
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: Broken Flap At Trailing Edge

Fri Jan 14, 2011 3:34 pm

Quoting etherealsky (Reply 4):

Is there a time limit on flying with that repair before it needs replacement?

Assuming it was done per the Structural Repair Manual, it's good for 24 months.

Tom.
 
Fly2HMO
Posts: 7207
Joined: Sat Jan 24, 2004 12:14 pm

RE: Broken Flap At Trailing Edge

Sat Jan 15, 2011 1:38 am

I'm assuming any performance penalty is negligible and they just go by operating the aircraft normally, right?
 
goboeing
Posts: 2428
Joined: Mon Jun 05, 2000 5:31 am

RE: Broken Flap At Trailing Edge

Sat Jan 15, 2011 6:33 am

Quoting Fly2HMO (Reply 7):
I'm assuming any performance penalty is negligible and they just go by operating the aircraft normally, right?

Correct.

Even a missing winglet barely does anything to performance numbers.
 
AA737-823
Posts: 4887
Joined: Wed Mar 01, 2000 11:10 am

RE: Broken Flap At Trailing Edge

Sat Jan 15, 2011 10:13 pm

Quoting GoBoeing (Reply 8):
Even a missing winglet barely does anything to performance numbers.

A missing flap canoe, however, is a bit bigger hit...
 
PGNCS
Posts: 2249
Joined: Sun Apr 15, 2007 5:07 am

RE: Broken Flap At Trailing Edge

Thu Jan 20, 2011 4:07 am

Quoting GoBoeing (Reply 8):
Quoting Fly2HMO (Reply 7):
I'm assuming any performance penalty is negligible and they just go by operating the aircraft normally, right?

Correct.

Even a missing winglet barely does anything to performance numbers.

Maybe on a 737, but that's far from universally true.

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