WhyByFlier.
Exactly as written. We were checking Vls in FMGC was similar to Vls on speedtape (which it was) We then watched Vapp reduce to speedtape Vls +4 so I checked what was on the Perf page. The old Vapp was 124, the new one was 123 and it was written in small font, so definitely not overwritten.
We both commented on it at the time. I had seen it before, my colleague had not...
Edit to add.
Today, my colleague activated approach in a 321 quite early. Perf page Vls was 135 (Vapp 140) and then we entered unexpected holding. Exceedingly long approach followed, we landed with the numbers saying 133 and 138, no other modifications and no I'm not dreaming it.
Now there are FMGC's by different manufacturers. Maybe this is a type difference between the one we use (that does simply use GW after app activation) and yours which may not?
Last edited by Cough; 7th Feb 2015 at 19:08.