Confusionabout A320NX SPD being set to 100 on take off

Can anyone explain why sometimes when I startup the A320NX the SPD is automatically set to 100 ?

At the moment when I take off I do the following

  • Take off
  • Raise gear
  • Switch throttle from TOGA to CLB when it says to
  • Engage Auto Pilot which depending on airport puts me in RWY TRK or NAV mode.

As soon as I do that the plane starts trying to lower its speed to 100. I cant switch SPD to managed mode because the plane has automatically gone into VS mode mode at my current pitch due to turning on autopilot which means I then have to switch that to managed mode and then finally that allows me to switch SPD to managed and then things are back to normal.

  • Sometimes it doesn’t do this, for example SPD 100 sometimes won’t be there after starting up the plane. No idea why

  • Why does the plane sometimes aumatically engage VS mode when you select autopilot after take off but other times it doesnt ?

Pretty sure you need to set the performance page and then manage mode will enable.

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