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Old 8th May 2011, 20:22
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CEJM
 
Join Date: Mar 2006
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HD, nothing has changed in recent years. All the Airbusses (318, 319, 320, 321, 330, 340 and most likely 380) have a function called ground speed mini.

It maintains a groundspeed and not an indicated airspeed. If you would ask us to maintain 160kts to 4 DME than we select this speed and fly it, i.e. 160 indicated. At 4 miles we go back to managed speed and on a windy day the ground speed mini might demand an indicated airspeed of 170kts (sometimes more) so the aircraft speeds up.

In general as far as I understand it is not a real problem for controllers when we fly a selected speed to 4 DME and than go managed speed, even if this means that we increase speed for a little while.

Where it can be a problem is when the controller ask us to reduce to minimum approach speed. In that case the speed can be high (170kts+ on windy day) while other (non airbus) traffic in fornt of us does 130 -140 kts.

Sorry not the best in explaining things but I hope this helped.
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