Originally Posted by
A320 Glider
I do think Airbus has a big advantage here over the 737.
Airbus has a speed range for the managed descent.
+/-20kts if I remember from the planned descent speed. It's shown very nicely on the PFD.
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Curious, why do you see that as an advantage? In light of this debate, the speed would still ‘wander’. Plus as easymxp explains, the new software allows the speed to go up to VMO-5 in order to maintain the profile.
As far as this debate goes, I’ve been told off by ATC and put on a diverging heading to create more separation with the preceding traffic for letting the speed drift +8 knots in managed descent (VNAV in Boeing speak). So you have to use common sense.