However, once in the landing config, and with the appropriate VAPP inserted into the MCDU, why can't we use managed speed to take advantage of ground speed mini protection?
Hello Rudderrudderrat,
I 'll try to make a better approach to your question since I wondered about this myself.
DSC-22_30-90 P 10/14
GROUND SPEED MINI FUNCTION PRINCIPLE
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The lowest speed target is limited to VAPP and its upper limit is VFE of next configuration in CONF 1, 2, 3 and VFE-5 in CONF FULL.
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Vapp would be fine as a low limit but the upper limit (since VFE and VFEnext are iaw lever position) would be inconsistent. So you would have a partially functioning Ground Speed mini (in certain failure cases the upper limit would "touch" the max speed i.e. 177kt ).