Actually GA flap is a must for flap full approach. Rest are all take of configurations so there are no performance issues. If a GA occurs in a tricky position flaps can be maintained as a situational remedy. Not retracting from flap1 is a non issue. Even in Flap3 first retraction (during acceleration) is flap1. Following para is from Airbus document.
When landing configuration is not established (CONF1 or CONF2) there is no particular need to retract the flaps one step as there is no drag issue, and therefore, no performance impact. However, standard go around procedure (GO AROUND – FLAPS) could be applied, even when in CONF1, provided TOGA detent is reached prior flaps retraction (to ensure GO AROUND phase engagement). A/THR and FD’s will maintain VLS, and Slats Alpha / Speed lock function will inhibit slats retraction if necessary.
Last edited by vilas; 21st Dec 2021 at 13:52.