Following a non-stabilised approach, an Airbus A321 neo initiated an automatic go-around (i.e. with
autopilot (AP) ON) which induced an aircraft pitch-up attitude that resulted in an AP disconnection.
Investigations identified that this pitch-up attitude after Go-around initiation was due to the
combination of the AP ON, high lift configuration, and Take-Off Go-Around (TOGA) thrust
application within 50 seconds after full retraction of the speed brakes.
Deeper analysis by computed simulation determined that, for some aircraft models of the A320
family, when operated at a significant aft centre of gravity (CG), the pitch attitude could further
increase after the abovementioned AP disconnection. However, such situation was never
encountered in flight
[...]
To address this potential unsafe condition, Airbus issued the applicable AFM TR, conditioning the
use of speed brake to prevent the aforementioned condition