|Quoting Bofredrik (Reply 4):|
It had a steady cruise on 33.000 ft and not any change of altitude.
I may be wrong on this but the aircraft may have been heavy for the given speed and altitude.
The engines increased power to take the aircraft to the selected speed and decreased it so as to keep the speed constant (at the selected atlitute)
However, for some reason or another, the aircraft slowed down which meant that the engines had to increase power again. And the process kept going like this.
Any Airbus pilots out there who can enlighten us?