What can controllers see?
Coming back in to a London airport this week, the director asked us to slow down to an assigned speed - due traffic ahead, which we could see on tcas. My colleague on the flight deck selected the speed but left the aircraft in vertical speed mode (V/S) which kept the descent going and the speed 30kts higher than asked, instead of using level change or open descent (Boeing/airbus). No more than 10 seconds later the director rightly asked us to reduce speed again, only this time to actually reach the speed requested!
My question is - what information can the controller see on his or her screen. In this case the correct speed was selected but not flown. I am also led to believe that the level set in the alt window is also visible to the controller, is this true?.
Best wishes,
Marvo