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A319 Ailerons Drooping

Cancidas From Poland, joined Jul 2003, 4112 posts, RR: 13
Posted (8 years 8 months 2 weeks 2 days 6 hours ago) and read 1507 times:

today i noticed that on one of our A319s both ailerons were drooping down. how can that be with fly-by-wire controls?

"...cannot the kingdom of salvation take me home."

8 replies: All unread, jump to last

NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 6
Reply 1, posted (8 years 8 months 2 weeks 2 days 4 hours ago) and read 1479 times:

Easy: No hyd pressure plus the weight of the aileron Equals droop. "Fly by wire" only means control by wire ( electrically ) via computers. Hydraulics still do the "heavy lifting".

Mr.BA From Singapore, joined Sep 2000, 3423 posts, RR: 23
Reply 2, posted (8 years 8 months 2 weeks 2 days 2 hours ago) and read 1445 times:

Noticed that Airbuses' flight controls droop pretty easily... I mean almost all kinds of their planes have the ailerons droop or 'drop' when the hydraulics are turned off but I don't seem to notice the same trend on many Boeings. Especially for the B744s, which the control surfaces are supposedly heavier but they don't seem to droop, not even the high speed ailerons... same goes for the B767.. or so. But the B777s do have the control surfaces droop pretty easily. Is this due to the different systems that power the controls? Seem to notice that FBW can droop easier...

Any explanation?

When I read this all over it sounds so odd Big grin

Boeing747 万岁!

Francoflier From France, joined Oct 2001, 3195 posts, RR: 10
Reply 3, posted (8 years 8 months 2 weeks 2 days 2 hours ago) and read 1442 times:

Not really right on topic, but I have also noticed that some a/c, especially the A32x family, have their rudders blown by the wind to either side.

Don't those a/c have some kind of gust lock device?

Looks like I picked the wrong week to quit posting...

Starlionblue From Hong Kong, joined Feb 2004, 15867 posts, RR: 66
Reply 4, posted (8 years 8 months 2 weeks 2 days 1 hour ago) and read 1435 times:

The construction of the actual hinge and mechanism probably differs slightly from plane to plane, which would explain the differences in behavior. I don't know exactly how they are built, but a simple counterweight in the mechanism would eliminate drooping, for example.

"There are no stupid questions, but there are a lot of inquisitive idiots." - from Citadel by John Ringo

Ual747 From , joined Dec 1969, posts, RR:
Reply 5, posted (8 years 8 months 2 weeks 2 days ago) and read 1424 times:

"Not really right on topic, but I have also noticed that some a/c, especially the A32x family, have their rudders blown by the wind to either side."

If you go to DFW terminal A, when there is the usual strong breeze from the south, all of AA's 777's will have their rudders looking like they are making a hard turn to the right.

UAL747

Iankay From United Kingdom, joined Sep 2004, 1 posts, RR: 0
Reply 6, posted (8 years 8 months 2 weeks 2 days ago) and read 1418 times:

If on takeoff/landing, the Airbus FBW software is programmed to droop the ailerons when full flap is selected.

320tech From Turks and Caicos Islands, joined May 2004, 487 posts, RR: 5
Reply 7, posted (8 years 8 months 2 weeks 1 day 23 hours ago) and read 1401 times:

What's with all the drooping aileron questions lately? Smile

A320 series ailerons and elevators droop because pressure is not retained in the servos when hydraulics are off. There is nothing special about fly by wire that would cause it, other than the lack of cables.

Rudders on all large aircraft will displace in a strong wind. Large aircraft don't have gust locks on the rudder (not even the Dash-8), they have dampers, that protect the rudder from being slammed over.

Incidently, the newest A320 series ailerons don't droop. Not sure what's different about them, I'll see what I can find out.

The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.

Rendezvous From New Zealand, joined May 2001, 499 posts, RR: 0
Reply 8, posted (8 years 8 months 2 weeks 16 hours ago) and read 1320 times:

You'll find that Boeing's have the aileron droop on the groun too. The 767's maily just the inboards and the elevators.

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