Originally Posted by
sonicbum
You might disagree with most if You make up your own procedures.
Originally Posted by
Uplinker
By reacting to gusts like that, the auto-thrust is working as designed and keeping you safe. Why prevent it ?
From the Airbus A320 Family Instructor Support manual: UDY0102 Jan 2001:
And, Hans; the whole point of GS Mini is to react to gusts and adjust the thrust to stay above a minimum energy, so it most certainly DOES adjust for gusts !! - that is its whole purpose.
Why disable this vital system just because you don't like the engines spooling up like that ? We cannot know the instantaneous wind*, so how do we know what is a safe speed/ energy/ thrust setting ?
* the three ADIRS do though
.
In twelve years of A320 I haven't landed with selected speed more than a very few times. All of those times the wind suddenly became much more gusty than forecast in the last 1000' (LAS in the summer: VAR10 G30 just as you get close, before that reported as calm....) . And it is not my made up procedure, we are specifically allowed to use selected for A) traffic ahead does not have GS mini, so have to reduce speed below GS mini (never below Vfas of course) and B) Gusty conditions on final when too late to add gust factor in the MCDU. I do know how GS mini works, and I have that same instructor manual. I am not afraid of the increase in thrust during a HW gust, because I know what it is doing, but I have seen without the gust addition the speed going below Vls during TW gusts. So for those cases I would rather select a higher speed and lose GS mini. The higher speed gives more buffer for TW gusts, and with HW gusts the thrust reduction because of no GSmini doesn't adversely affect the energy state as much because the higher buffer from Vls.
Also, the original question was specifically for Xwind gusts, and GS mini is just about a HW component addition to Vfas, no addition for Xwind.
And I am definitely not suggesting using selected just because your magenta bug seems too high/going up and you don't understand GSmini.....