Look, the current flap damage system is quite funny.
Looks like you dont have that part anymore, but once its locked in a down position and lost, that non-existing part generates tons of lift and makes your plane uncontrollable.
I see 3 possible good choices:
1: if the flap is damaged, make it disappear, but plz, dont let it generate lift anymore
2: if a flap is damaged, dont make it disappear, and it can add the same lift as now. Much better impression.
3: two-staged damage system, the combination of the two above. It sounds the best /for me/ but also this requires the most modelling work.
Opinions?