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Tale Fin Moved To The Left?  
User currently offlineB773 From Australia, joined Jan 2001, 74 posts, RR: 0
Posted (11 years 2 months 2 weeks 6 days 3 hours ago) and read 1319 times:

Why do sometimes when planes are parked, they move the back part of the tail to the left?



7 replies: All unread, jump to last
 
User currently offlineUal747 From , joined Dec 1969, posts, RR:
Reply 1, posted (11 years 2 months 2 weeks 6 days 3 hours ago) and read 1304 times:

It's probably moved in a certain direction because of the wind. At DFW, walk by the line up of 777's at the gate, and all of their rudders will be turned to the left because of a wind coming from the South.

UAL747


User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 2, posted (11 years 2 months 2 weeks 5 days 23 hours ago) and read 1268 times:

I would guess it has something to do with hydraulics and the actuators on the rudder fin. Probably it's because the APU powers some system and not the other. I have seen A300's sitting on the gate with only the right low-speed aileron drooped all the way down, and the other horizontal. It is just a guess, someone please correct me if I'm misataken

-Alfredo


User currently offlineAJ From Australia, joined Nov 1999, 2397 posts, RR: 25
Reply 3, posted (11 years 2 months 2 weeks 5 days 20 hours ago) and read 1239 times:

Pretty close, it is because the hydraulics are not pressurised, allowing gravity and wind to affect the control surfaces. The outboard ailerons on a Boeing remain level as they are mass balanced.

User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 4, posted (11 years 2 months 2 weeks 5 days 20 hours ago) and read 1228 times:

Probably it's because the APU powers some system and not the other. I have seen A300's sitting on the gate with only the right low-speed aileron drooped all the way down, and the other horizontal.

If any of the A300-600's three hydraulic systems are powered, both left and right All Speed Ailerons should be (Better be...) neutral (horizontal)....



"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineBio15 From Colombia, joined Mar 2001, 1089 posts, RR: 7
Reply 5, posted (11 years 2 months 2 weeks 5 days 6 hours ago) and read 1150 times:

I couldn't find a picture of an A300 with only the right aileron hanging down, here's two with both hanging down:


View Large View Medium
Click here for bigger photo!

Photo © Orlando Beaumont
View Large View Medium
Click here for bigger photo!

Photo © Darcy Stevens



DC10hound,
It sounds pretty logical to me that all equal control surfaces on each side should be powered by the same systems. It would mean less risk in the event of one system failure, right?

AJ,
If the systems were not pressurized on the A300's I saw, what is a probable cause that the left aileron remained straightened horizontally?

Thanks in advance
-Alfredo


User currently offlineFlyingbronco05 From United States of America, joined May 2002, 3840 posts, RR: 2
Reply 6, posted (11 years 2 months 2 weeks 4 days 7 hours ago) and read 1054 times:

they move the back part of the tail to the left?

It's called the rudder and or rudder tab/trim.

FB05



Never Trust Your Fuel Gauge
User currently offlineAJ From Australia, joined Nov 1999, 2397 posts, RR: 25
Reply 7, posted (11 years 2 months 2 weeks 4 days ago) and read 1018 times:

Alfredo, the time for the surfaces to droop depends on a few factors, retention of hydraulic pressure in well sealed lines, wind or other external pressures etc.

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