Speed brake difference between A319/321 and 320.
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Speed brake difference between A319/321 and 320.
Short but simple question:
Why is it that with the A319 and A321 you can pull full speedbrake with the A/P engaged. And with the A320 you can only deploy half speedbrake, so to deploy full speedbrake in the 320 you have to disengage the A/P.
Any idea why this difference is?
Cheers!
Why is it that with the A319 and A321 you can pull full speedbrake with the A/P engaged. And with the A320 you can only deploy half speedbrake, so to deploy full speedbrake in the 320 you have to disengage the A/P.
Any idea why this difference is?
Cheers!
Join Date: Jul 2006
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Hello
A320: The maximum speedbrake deflection in manual flight is:
40° for spoilers 3 and 4
20° for spoiler 2.
The maximum speedbrake deflection with the autopilot engaged is:
25° for spoilers 3 and 4
12.5° for spoilers 2.
A319: The maximum deflection for spoilers is:
25° for spoilers 3 and 4
12.5° for spoilers 2 in configuration 3, and 17.5° in other configuration
A321 dont know
. Also the wing loading/load factor would diff for the two a/c. may be the autopilot cannot handle the associated loads of 40dg of spoilers
anyone else care to clarify?
40° for spoilers 3 and 4
20° for spoiler 2.
The maximum speedbrake deflection with the autopilot engaged is:
25° for spoilers 3 and 4
12.5° for spoilers 2.
A319: The maximum deflection for spoilers is:
25° for spoilers 3 and 4
12.5° for spoilers 2 in configuration 3, and 17.5° in other configuration
A321 dont know
. Also the wing loading/load factor would diff for the two a/c. may be the autopilot cannot handle the associated loads of 40dg of spoilers anyone else care to clarify?
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I think its to do with the flight software loaded. The A320 original software cannot cope with the trim changes etc associated with spoiler extension/retraction. I think A319/21 uses later software.
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I believe it had to do with rapid decompression profile...originally you were able to get full speedbrakes with ap on with the 320. However during a rapid decompression senario when you deployed the spoilers at altitude coupled with the slow pitch over, the wings were loaded up and it would trigger a high aoa, retract the spoilers and produce a spoiler disagree message. So you would either have to reset the spoilers, or more than likely you would not notice them and trying to get down in a hurry without the spoilers. Additionally I believe that the full spoilers with ap on with the 319 is the same as half spoilers with ap on with the 320.
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Funny how essential facts are subject of discussion.
Please don't get me wrong. Used to be also a busdriver in the greyshade.........
Please don't get me wrong. Used to be also a busdriver in the greyshade.........
Last edited by hetfield; 22nd Sep 2006 at 20:34.
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Pander...look at gear pins reply and spoiler deflection ..the 319 and 320 are the same=max deflection(A/P on A320..A/P on or off on the 319).....difference is with the Auto pilot off on the 320 you can get up to 40 ....if you take the A/P off the 319 you still only get 25.......sounds a little confusing but from what Ive been told it is only a design feature
