Originally Posted by CONF iture
That's how the alpha protection has been designed.
At full back stick the elevators are all for the AoA control to maintain it at alpha max.
That is correct - it is not designed to maintain airspeed. But never mind, OK465 has settled that aspect. Apparently the speed variation is only a few knots for the magnitude of the thrust increase and the rate of change involved.
P.S.
With the natural phugoid period being approximately 28 seconds the speed variation of 'a couple of knots' in that period would be quite slow so it would easily go unnoticed.