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MD-80 Wings  
User currently offlineBruno From United States of America, joined Jan 2000, 853 posts, RR: 3
Posted (16 years 3 months 2 weeks 6 days 16 hours ago) and read 1092 times:

What are those protusions on the under side of MD-80 wings for and why don't any other planes have them?

I support the women’s movement up and down!
5 replies: All unread, jump to last
User currently offlineUal747 From , joined Dec 1969, posts, RR:
Reply 1, posted (16 years 3 months 2 weeks 6 days 16 hours ago) and read 1016 times:

Are you talking about forward or aft of the wing?

User currently offlineDoug From United States of America, joined Jul 1999, 861 posts, RR: 0
Reply 2, posted (16 years 3 months 2 weeks 6 days 16 hours ago) and read 1011 times:

no idea

User currently offlineWingnut From United Kingdom, joined Jun 2005, 1 posts, RR: 0
Reply 3, posted (16 years 3 months 2 weeks 6 days 15 hours ago) and read 998 times:

They are fairings for the flap actuators and hinges

User currently offlineDash8 From New Zealand, joined Aug 2005, 16 posts, RR: 0
Reply 4, posted (16 years 3 months 2 weeks 6 days 14 hours ago) and read 991 times:

I think Bruno is referring to the protrusion under the leading edge mid-length.
thos are called wing fences, and you find the on many "older" wing designs, including the 727. The design is just a little different.
See, wing fences prevent spanwise (root to tip) airflow commonly found on all wings.
Spanwise flow of air causes drag at the tip of the wing. Think of it as a "misplaced" winglet.
I think it also served another function on swept wings, but I can't seem to put my finger on it. Maybe it'll come to me. Meanwhile anyone is free to remind me.


Xander Koote

User currently offlineBuff From Australia, joined Mar 2007, 0 posts, RR: 1
Reply 5, posted (16 years 3 months 2 weeks 6 days 12 hours ago) and read 981 times:

Wing fences, although I couldn't see from the picture provided by Doug, can also serve the same purpose as vortex generators, i.e. boundary layer rejuvenation.

I think what Doug was asking about are the flap track actuator fairings.

It's nice to see some new e-faces on the forum!

Best Regards,


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