Originally Posted by HN39
When flying at alphamax, thrust controls altitude through speed
Negative - Alpha max is an AoA that the FCS maintains at the fixed value Airbus decided to adopt depending on the configuration.
The corresponding speed to that fixed alpha max value is called Valphamax and remains the same as well, be it in level flight descent or climb ... The amount of thrust will decide the V/S but the speed will remain at Valphamax.