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Winglets And Moisture / Slush Build Up.  
User currently offline9844 From United States of America, joined Nov 2001, 199 posts, RR: 0
Posted (6 years 10 months ago) and read 2395 times:

Just today during a walk around I notice water and ice build up just at the tip of the wing where the winglets are fastened. At first I thought this was fuel. Opon closer inspection it was found to be water / slush. I checked the other wing tip and found the same accumulation. this particular aircraft is a 737-300 with the winglet mod. I walked over to the adjasent gate with a new 737NG aircraft and noticed the same thing. Water and ice accumulation is bad news. Asking around the shop no one knows of a problem, then again no one has looked for it. Nothing documented in our GMM or other references.

Anyone on this board notice this problem?

6 replies: All unread, jump to last
 
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 1, posted (6 years 9 months 4 weeks 1 day 3 hours ago) and read 2294 times:

Quoting 9844 (Thread starter):
Anyone on this board notice this problem?

Where was it accumulating, exactly? On the upper wing skin?

Tom.


User currently offline9844 From United States of America, joined Nov 2001, 199 posts, RR: 0
Reply 2, posted (6 years 9 months 4 weeks 1 day ago) and read 2267 times:

Nope on the bottom of the wing. There is a panel on the fwd section of the wing tip with rivets running paralel to the leading egde. the water and slush accumulated along those rivets. From what I saw the moist area looked to be about 10" long

Hope this helps.


User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 3, posted (6 years 9 months 4 weeks 23 hours ago) and read 2242 times:

Quoting 9844 (Reply 2):
Nope on the bottom of the wing. There is a panel on the fwd section of the wing tip with rivets running paralel to the leading egde. the water and slush accumulated along those rivets. From what I saw the moist area looked to be about 10" long

Sounds like the leading edge cavity ahead of the surge tank. That is a flammable fluid leakage zone so it ought to have drainage. It could be that it drains properly under flight loads when the wing tips bend up. Still, not supposed to be pooling liquid anywhere...

Tom.


User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 4, posted (6 years 9 months 4 weeks 21 hours ago) and read 2237 times:

Could it condensation freezing?  confused  Though I do admit, at the wing tips seems out of place.

This past summer, I noticed on an MD-11 and an AN-124 that as the aircraft were refueled, a massive amount of condensation built up and dripped off the bottom of the wing, due in part from the cold fuel in the tanks cooling the ambient air around the wings past its dew point.


User currently offlineHAWK21M From India, joined Jan 2001, 31660 posts, RR: 56
Reply 5, posted (6 years 9 months 4 weeks 12 hours ago) and read 2165 times:

Quoting 9844 (Thread starter):
I notice water and ice build up just at the tip of the wing where the winglets are fastened


View Large View Medium
Click here for bigger photo!

Photo © Josh-4A7 Spotters


Could not find a B733 Winglet pic though.But is it similiar.
regds
MEL



Think of the brighter side!
User currently offline9844 From United States of America, joined Nov 2001, 199 posts, RR: 0
Reply 6, posted (6 years 9 months 2 weeks 2 days 2 hours ago) and read 1931 times:

Quoting Tdscanuck (Reply 3):



Quoting Tdscanuck (Reply 3):
Sounds like the leading edge cavity ahead of the surge tank. That is a flammable fluid leakage zone so it ought to have drainage. It could be that it drains properly under flight loads when the wing tips bend up. Still, not supposed to be pooling liquid anywhere...

I did the old smell and taste test. No fuel there. I will try and get a picture of it and post. It dosnt look like a drainage area. Just looks like a cavity covered with a panel.


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